CH C1 User manual
C1 Digital to Analog Controller
User Manual
Dear Client,
We are honored that you have chosen the CH C1 Digital to Analog Controller. Our team has put all his efforts into designing and
manufacturing this top quality versatile and future-proof product and is proud to present it to you. We hope your C1 will bring you
uncountable hours of emotion from your musical collection.
But before starting your musical journey, we kindly ask you to pay attention to the information contained in this manual. The C1,
as you will discover in the following pages, is a Swiss precision product designed for ultimate performance and flexibility. However,
reaching sonic excellence requires your unit to be setup and operated correctly and this what this manual is all about. If you have
any questions or require assistance, please don't hesitate to contact your authorized dealer.
We hope you will enjoy your C1 D/A Controller for many years.
The Concert has just begun...
Cossy F.
Heeb T.
FCC-Notice
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However there is no guarantee that
interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
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adjust or relocate the receiving antenna
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increase the separation between the equipment and the receiver
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connect the equipment into a mains outlet on a circuit different from that to which the receiver is connected
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consult the dealer or an experienced ratio/TV technician for help
Disposal – Environmental care
Directive 2002/96/EG of the European Parliament requires consumer electro-technical appliances to be
disposed separately and have to be indicated with the following symbol. Should you dispose this
component please do so in conformity with local and global legal and environmental regulations and
according to best practices. We strongly encourage you to recycle any batteries used with this component.
Table of contents
1 Technical Highlights.............................................................................................................................................................. 8
1.1 Digital to analog conversion......................................................................................................................................... 9
1.1.1 Clock management............................................................................................................................................. 9
1.1.2 HiD processing engine......................................................................................................................................... 9
1.1.3 D/A conversion stage........................................................................................................................................ 10
1.1.4 Output stage.................................................................................................................................................... 10
1.1.5 Volume control capability.................................................................................................................................. 10
1.2 Mechanical construction............................................................................................................................................. 11
1.3 Modular architecture and slot-in boards...................................................................................................................... 11
1.3.1 Digital inputs and CH Link: DIGITAL_IN board.................................................................................................... 12
1.3.2 USB Audio inputs: USB_IN board option............................................................................................................. 12
1.3.3 Analog inputs: ANALOG_IN board option........................................................................................................... 12
1.3.4 External clock synchronization: SYNC_IO board option........................................................................................ 12
1.3.5 Ethernet streaming: NETWORK board option....................................................................................................... 13
1.4 Power supply............................................................................................................................................................ 13
1.4.1 Optional external power supply......................................................................................................................... 13
2 Before Use........................................................................................................................................................................ 14
2.1 Package content........................................................................................................................................................ 14
2.2 Safety notice............................................................................................................................................................. 14
2.3 User Manual............................................................................................................................................................. 15
2.4 Mains supply............................................................................................................................................................. 15
2.5 Transport and packaging............................................................................................................................................ 15
2.6 Cleaning................................................................................................................................................................... 16
2.7 Maintenance and service............................................................................................................................................ 16
3 Installation........................................................................................................................................................................ 17
3.1 Unpacking................................................................................................................................................................ 17
3.1.1 Removing the security screw.............................................................................................................................. 17
3.2 Positioning................................................................................................................................................................ 17
3.2.1 Unit position adjustment.................................................................................................................................... 17
3.2.2 Adjustment shaft covers.................................................................................................................................... 18
3.3 Connections............................................................................................................................................................... 19
3.3.1 CONTROL board................................................................................................................................................ 20
3.3.1.1 USB port.................................................................................................................................................. 21
3.3.1.2 Ethernet port........................................................................................................................................... 21
3.3.2 NETWORK board............................................................................................................................................... 21
3.3.2.1 USB port.................................................................................................................................................. 21
3.3.2.2 Ethernet port........................................................................................................................................... 21
3.3.3 DIGITAL_IN boards........................................................................................................................................... 21
3.3.3.1 Standard digital inputs............................................................................................................................. 22
3.3.3.2 CH Link digital audio interface.................................................................................................................. 22
3.3.4 USB_IN boards................................................................................................................................................. 22
3.3.4.1 Microsoft Windows configuration (XP, Vista, 7 and 8).................................................................................. 23
3.3.5 ANALOG_IN boards.......................................................................................................................................... 23
3.3.6 SYNC_IO board................................................................................................................................................ 24
3.3.6.1 BNC clock input........................................................................................................................................ 24
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3.3.6.2 BNC clock outputs..................................................................................................................................... 25
3.3.7 Power cord receptacle and voltage selection....................................................................................................... 25
3.3.8 External power supply connector....................................................................................................................... 25
4 Operation.......................................................................................................................................................................... 26
4.1 Front panel controls................................................................................................................................................... 26
4.1.1 Front panel...................................................................................................................................................... 26
4.1.2 User control knob............................................................................................................................................. 26
4.2 Operating modes....................................................................................................................................................... 28
4.2.1 Normal mode................................................................................................................................................... 28
4.2.2 Shortcuts.......................................................................................................................................................... 29
4.2.3 Menu mode...................................................................................................................................................... 31
4.3 Configuration............................................................................................................................................................ 34
4.3.1 C1 configuration menu items............................................................................................................................. 35
4.3.1.1 AUDIO SETTING........................................................................................................................................ 35
4.3.1.2 DISPLAY SETTING...................................................................................................................................... 38
4.3.1.3 SHORTCUTS.............................................................................................................................................. 40
4.3.1.4 FACTORY SETTING..................................................................................................................................... 41
4.3.1.5 INSTALLED OPTIONS................................................................................................................................. 42
4.3.1.6 NETWORK................................................................................................................................................ 43
4.4 Remote control.......................................................................................................................................................... 44
4.4.1 Remote control operation.................................................................................................................................. 44
4.4.2 Changing the remote control batteries................................................................................................................ 45
4.5 Advanced clocking..................................................................................................................................................... 45
4.5.1 General clocking considerations......................................................................................................................... 45
4.5.2 Without SYNC_IO board.................................................................................................................................... 45
4.5.3 C1 D/A controller (with SYNC_IO board) + D1 SACD/CD drive (with SYNC_IO board)..........................................46
4.5.4 3x C1 D/A controllers + multichannel D1 drive (all with SYNC_IO board)............................................................47
4.5.5 C1 D/A controller + Computer (USB audio)........................................................................................................ 49
4.5.6 C1 D/A controller + Computer (Ethernet audio streaming).................................................................................. 49
4.6 Returning to Factory defaults..................................................................................................................................... 50
5 Firmware update............................................................................................................................................................... 51
5.1 Introduction.............................................................................................................................................................. 51
5.2 Firmware Update procedure....................................................................................................................................... 51
5.2.1 Preparing the firmware image........................................................................................................................... 51
5.2.2 Updating the firmware (Firmware Update procedure)......................................................................................... 52
5.2.3 Emergency Firmware Update procedure............................................................................................................. 52
6 Troubleshooting................................................................................................................................................................. 54
7 Specifications..................................................................................................................................................................... 56
7.1 Specifications............................................................................................................................................................ 56
7.2 Dimensions............................................................................................................................................................... 58
7.3 Factory settings......................................................................................................................................................... 59
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1
Technical Highlights
CH products are proudly designed and manufactured in Switzerland by CH Precision Sàrl. Our engineers have put all their knowhow into bringing you the C1, a top performances future-proof digital to analog (D/A) controller, based on slot-in boards and USB
flash-drive firmware update. In its base version the C1 is a four inputs D/A converter, with integrated preamplifier functions such
as source selection and volume control. Default configured C1 have one DIGITAL_IN board and a CONTROL board. Audio inputs on
each DIGITAL_IN board include three standard digital audio connectors (RCA coaxial S/PDIF, TOSLINK optical S/PDIF and XLR AESEBU) supporting S/PDIF encoded PCM up to 24bits/192kHz, as well as proprietary high definition CH Link interface, supporting
both I2S PCM (up to 32 bits/768kHz) and native DSD audio signal connection.
Optional boards allow to extend the functionality of the base version of the C1 D/A controller. By adding extra DIGITAL_IN boards
(a total of up to three input boards can be plugged in the unit), the C1 can be connected to even more standard digital sources.
Addition of optional USB_IN board and/or optional NETWORK Ethernet streaming board (replaces standard CONTROL board)
unleashes the full capabilities of the C1 as the ultimate high-resolution computer audio file player. On the other hand, ANALOG_IN
optional board will turn your C1 into a top quality preamplifier while offering single-ended RCA and balanced XLR analog inputs.
Finally, the SYNC_IO optional board provides advanced clock synchronization capabilities for use with external clock generators or
to enslave the D1 SACD/CD drive to the C1's Masterclock for zero-jitter connection.
(1)
(9)
(2)
(10)
(3)
(3)
(4)
(11)
(12)
(5)
(13)
(6)
(7)
(3)
(3)
(8)
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C1 main components
(1) External power supply input. For X1 optional external power supply only
(2) Mains switch and power cord receptacle (on back panel)
(3) Adjustment shafts and screws
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(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
Power supply section
Main power transformer
Standby power transformer (ensures green mode Standby)
Power supply regulation board
AMOLED display (on front panel)
Audio in, clock in/out, USB (firmware update) and RJ-45 (control/network) connectors (from slot-in boards). Analog ground to Earth jumper
Slot-in boards (SYNC_IO, CONTROL/NETWORK, DIGITAL_IN/USB_IN/ ANALOG_IN)
Main processing and control board
Left channel DAC board
Right channel DAC board
Concentric push control knob
1.1 Digital to analog conversion
The C1 D/A controller is built around a synchronous CH-HiD processing engine feeding two first grade factory-calibrated monaural
D/A conversion boards. The conversion stage is a linearized R2R topology, followed by a fully discrete output stage. The whole
purpose of this design is not only to reconstruct correct level information but also perfect timing, since it is the key element for
recreating nature-like immersion into a musical performance.
1.1.1 Clock management
The first requirement to achieve perfect timing is that audio data are fed into the DAC chips synchronously to a jitter-free clock.
This is why two high-precision low-drift audio crystal clock oscillator (22.5792 MHz for 44.1 kHz multiples and 24.576 MHz for 48
kHz multiples) are located only a few cm from the DAC chips. The clocking section has its owns dedicated power supply fully
decoupled (complete galvanic isolation) from all noisy digital signals. This critical Masterclock signal is carried to the DAC chips in
LVDS (low-voltage differential signaling) form to avoid any cross-talk pollution.
In order to be synchronous to the incoming audio signal, these crystal oscillators can be fine tuned using a voltage controlled
feedback (VCXO), computed by a proprietary algorithm. Performances of this “digital phase-locked loop” (digital PLL) is jitter
rejection below 0.1 Hz, while frequency tracking is achieved through sub 0.1 PPM correction steps. Phase alignment is also
guaranteed with a +/-2.5 us accuracy. When combined with matching CH D1 SACD/CD drive and optional synchronization boards
(or a computer source), the C1 can even be configured as the clock master, having the source (either CH D1 or computer) clockenslaved. In such configuration, the jitter is completely removed from the system.
1.1.2 HiD processing engine
After years of development in the high-end audio industry we came to the conclusion that the digital samples contained in the
original audio stream should remain untouched, only computing missing information between them to remove most of the burden
(and phase non-linearity) off the analog filtering stage. Compared to widely-used asynchronous sample rate conversion (ASRC),
synchronous up-sampling removes all harshness often found in digital players.
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The 4.8GFLOPS DPS engine used for each channel performs several tasks, including synchronous up-sampling (to 705.6/768 kHz),
DSD to PCM conversion (for DSD layer playback of SACDs), volume control, resolution enhancement and linearity enhancement
(proprietary scrambling algorithm).
1.1.3 D/A conversion stage
The digital to analog conversion stage of each channel is handled by four Burr-Brown PCM 1704 R2R chips.
While total harmonic distortion (THD) figure of top R2R conversion chips (such as PCM 1704 used in C1) is slightly less impressive
than those of Delta-Sigma technology based converters, their temporal behavior (on transient events which music is filled with) is
inherently better. The high frequency behavior (above 20 kHz) is also much more accurate and free from modulation noise that
often disrupts treble speakers (tweeters), as high energy content into the 20 kHz -100 kHz band can not be handled properly by
most tweeters.
Combining four PCM 1704 the way it is done in the C1 enables improved THD figures compared to individual conversion chips and
to exploit their full output range (scrambling) which leads to an enhanced linearity, especially for small signal modulation (which is
common in the C1, especially when used as a preamplifier with volume control).
In order to achieve reproductive audio performances through our production, each chip used for a single channel should be
identical, including gain and offset. Unfortunately, tolerances on these parameter is rather loose. In order to avoid costly manual
component measurement and matching (or disparity of the audio performance of a production batch), we have introduced a fully
automated calibration process that is factory-performed, and can also be run by customer to keep top performances over time.
During this calibration process, the DSP sets several codes to each individual DAC chip, while a dedicated analog to digital converter
(ADC) measures the resulting voltage. The DSP is then able to compensate for any disparity across DAC chips on a DAC board.
1.1.4 Output stage
Each PCM 1704 chip outputs an analog current which reflects the digital code fed to the C1.
It is first converted by an ultra-fast current to voltage stage (I-V). The bandwidth of this stage has to be very wide, in order not to
distort (i.e. add harmonic distortion) the staircase shape of the sample-and-hold DAC chip output.
A fully discrete low-pass filter without feedback comes next, to smooth out the voltage signal without generating in-band phase
shift.
Finally, a differential output stage with high output current capability follows, driving single-ended 75 Ohm WBT nextgen RCA,
single-ended 50 Ohm BNC and fully-balanced Neutrik XLR connectors.
1.1.5 Volume control capability
The C1 can be used as a pure DAC (digital to analog converter) together with an analog preamplifier. But it can also be used as a
controller, directly feeding power amplifiers. In that case, it allows volume control in the range of -95.5 dB to +24.0 dB (with
0.5dB steps), with full muting capability when volume is turned lower than -95.5 dB. Positive gain (+0.5 dB to +24.0 dB) is only
possible when the incoming signal is lower than 0 dBFS (full scale). Otherwise, the C1 will automatically decrease the volume in
order to avoid any clipping. Left/right balance correction is also available in a +/- 6dB range (with 0.5dB steps).
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Volume control is achieved by a combination of analog attenuators and high resolution digital multiplication.
When the volume is set in the range -95.5 dB to -12.5 dB, a 12 dB analog attenuator in engaged, and the DSP attenuates (i.e.
multiply the audio sample in 32 bits floating point resolution) by [volume + 12 dB].
When the volume is set between -12.0 dB and -6.5 dB, a 6 dB analog attenuator in engaged, and the DSP attenuates by [volume
+ 6 dB].
When the volume is in the range -6 dB to 0dB, no analog attenuator is engaged, and the DSP attenuates by [volume].
When the volume is positive (i.e. +0.5 dB to +24.0 dB), no analog attenuator is engaged, and the DSP applies a positive gain
corresponding to [volume], whenever possible. If the DSP detects that the upcoming resulting samples will digitally clip (sample
value * volume > 0 dB full scale), it will soft clip this event and automatically decrease the volume to a value that will avoid
clipping in the future.
1.2 Mechanical construction
The C1 D/A controller is assembled from high-quality aluminum and steel elements with no visible screws on the front, top and
side panels. The front panel, base, side panels and top cover are machined from aluminum. The power supply is isolated from the
audio section in its own compartment to avoid any contamination of the audio circuits by noise radiated from the supply. Pin
assembly of all chassis elements provides smooth joints between elements while screws every 6cm ensures protection against
electromagnetic interferences. First class mechanical and chemical surface treatments provide the luxury finish of the C1.
Four steel feet support the unit. Each feet ends with a elastomer ring to sit on delicate surfaces but is also equipped with a height
adjustable steel spike to fine tune unit positioning. Horizontal adjustment is done with the provided screwdriver through the four
adjustment shafts accessible from the top of the unit. In addition to providing convenient horizontal adjustment from the top of the
unit, the shafts also serve as vibration evacuation channels for any stacked unit. Special shaft covers are provided to interface with
the spikes of the stacked unit. Any vibration from the upper unit is transmitted by the shaft cover to the shaft and from the shaft to
the lower unit feet or spike, forming a privileged path for vibrations evacuation.
1.3 Modular architecture and slot-in boards
The C1 benefits from a fully modular architecture. It features separated sections for power-supply, front panel, computing +
signal/clocks routing + central host processor, slot-in boards and monaural conversion boards. This modular architecture combined
to the USB plug for all firmwares (MCU, DSPs and FPGAs) update allows for easy servicing and upgrade should one section become
faulty or obsolete.
The slot-in boards section consists in a vertically mounted mother board with optional boards plugged into it. Optional boards
provide audio functionality and connectivity to other equipment. There are six types of slot-in boards:
•
DIGITAL_IN: provides three standard digital audio input plus a proprietary CH-link input
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USB_IN : provides asynchronous USB audio (up to 24bits/192kHz) input. Computer is enslaved to the C1, sending audio
packets a a C1-specified rate
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ANALOG_IN: provides single-ended RCA and balanced XLR analog audio input
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SYNC_IO: provides advanced clock synchronization options (1 clock in, 2 clock out)
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CONTROL: provides a USB port for software upgrade and an Ethernet port for command
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NETWORK: optional board used to upgrade the CONTROL board slot. Provides a USB port for software upgrade and an
Ethernet port for high resolution audio streaming and command
There are five slots in the C1. Three of them can be populated with any combination of DIGITAL_IN, USB_IN and ANALOG_IN
boards. One of them is dedicated to the optional SYNC_IO board while the last one is default loaded with a CONTROL board, but
can be upgraded to a NETWORK board for Ethernet streaming capability. Note that optional boards MUST be installed by a
qualified technician. Failure to do so will void any warranty.
1.3.1 Digital inputs and CH Link: DIGITAL_IN board
Each DIGITAL_IN board provides standard digital inputs in XLR (AES-EBU), Coaxial RCA (S/PDIF) and Optical TOSLINK (S/PDIF)
formats as well as in the CH Link high-definition proprietary format. CH Link uses a dedicated connector to carry high resolution
audio and control data over a single link between CH units. It supports both PCM (up to 768kHz, 32bits) and DSD. To comply with
high definition digital content protection, DSD signals are cyphered when transported over CH Link from the D1 to the C1. On its
standard digital input connectors, C1 can lock to incoming S/PDIF modulated 16 or 24 bits PCM audio, at sample rates of 44.1, 48,
88.2, 96, 176.4 or 192 kHz, +/- 80 PPM.
1.3.2 USB Audio inputs: USB_IN board option
The USB_IN board provides asynchronous UBS audio input. Asynchronous mode means that the C1 is the clock master, and the
computer is the clock slave. Therefore no jitter is imported from the computer world. Moreover, all noisy digital devices on this
board (such as the DSP) are powered by the USB port (i.e. by the computer), and are galvanic isolated from the rest of the C1. The
USB input can be configured (in C1's menu) as audio class 1.0 (no driver required, Fs limited to 96kHz) or as audio class 2.0 (a
provided driver is needed for Microsoft Windows XP/Vista/7 systems, Fs up to 192kHz are supported).
1.3.3 Analog inputs: ANALOG_IN board option
The ANALOG_IN board features stereo analog input on two connector pairs: a single-ended RCA pair and a balanced XLR pair. The
analog stage design is fully discrete. One can find high-grade A/D conversion chip on this board, using the same high-precision
low-jitter clock signals as the two monaural DAC boards. The analog data are sampled at the rate of 5.6448 MHz (DSD2x) before
entering one 32 bit floating point DSP per channel. This option turns the C1 into an analog preamp.
1.3.4 External clock synchronization: SYNC_IO board option
The SYNC_IO board provides advanced clock synchronization options for C1 when used with an external clock generator or
matching CH source (such as the D1). It includes a clock input on BNC connector with selectable 75 Ohm or high input impedance.
Supported input frequencies on this connector are all standard audio Wordclocks (44.1, 48, 88.2, 96, 176.4 and 196 kHz), audio
Masterclocks (22.5792 and 24.576 MHz), DSD bitclock (2.8224 MHz) and atomic-clock multiples (100 kHz and 10 MHz). When
fed with an audio Wordclock, the C1's internal clock will lock its VCXO internal clock in frequency and in phase (phase accuracy of
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+/- 2.5 us), tracking below 0.1 Hz with 0.1 PPM corrections for optimal jitter rejection.
Two 75 Ohm Wordclock outputs completes the input/output capabilities of the SYNC_IO board.
When C1 is matched with a D1, both equipped with a SYNC_IO board, the optimal configuration is to set the C1 as the clock master
(C1 clock source: INTERNAL), and D1 as the clock slave (D1 clock source: SYNCHRO BNC 75). In that case, connect one of C1's BNC
clock out to D1's clock in configured as a 75 Ohm input with a 75 Ohm BNC-terminated cable.
1.3.5 Ethernet streaming: NETWORK board option
The CONTROL board can be replaced by a NETWORK board, providing all the features of the CONTROL board, plus Ethernet based
audio streaming. Once a musical server is installed and configured properly, simply connect the C1's Ethernet plug to you local
network to use it as an audio renderer. High resolution audio format are supported, and the complete system is enslaved to the
C1's internal clock for jitter-free playback.
1.4 Power supply
The power supply of the C1 is a linear supply with multiple independent local regulations. It is based on an oversized magnetically
shielded toroidal mains transformer and includes a mains filter. A secondary (also toroidal) transformer is used as Standby
transformer to ensure green Standby mode, meeting the latest energy saving regulations. Both transformers have static shields
between primaries and secondaries. They are mounted on a separate steel plate which is isolated from the main base aluminium
plate by silent blocks.
Discrete (power-transistor and op-amp based) ultra low noise regulators are used throughout the power supply and special care has
been paid to the Masterclock power supply. The Masterclock benefits from its own dedicated supply, completely decoupled from the
noisy digital and motor sections. This ensures an ultra-low jitter clock source for the whole system.
Input AC voltage to the power supply can be set to 100V, 115V or 230V AC depending on your local mains voltage.
1.4.1 Optional external power supply
The C1 is equipped with an external power supply input. This input is dedicated to the CH X1 external power supply. When the
external power supply is connected, the internal power supply of the C1 is turned-off (only the Standby transformer remains
active). Turning the internal power supply off ensures that no power supply induced noise or radiations are generated inside the C1
unit, thus permitting optimal operating conditions for the circuits.
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2
Before Use
Please read the following carefully.
2.1 Package content
Make sure that the package content is complete. If not, please contact your authorized dealer. Your package should contain:
•
C1 D/A controller
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Power cord
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Accessory box
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User Manual (this manual, located in the accessory box)
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C1 D/A controller Service Booklet with warranty card (located in the accessory box)
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Remote control (located the in the accessory box)
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Adjustment screwdriver (located in the accessory box)
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4x adjustment steel spikes (located in the accessory box)
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4x adjustment shafts steel stacking covers (located in the accessory box)
•
4x adjustment shafts aluminum top covers (located in the accessory box)
Please store the packaging material for future transportation. Check your C1 D/A controller for apparent damages. In case of
damage, please contact your authorized dealer. If your C1D/A controller is still very cold from transport, please let it warm up to
room temperature in order to avoid condensation inside the unit.
2.2 Safety notice
Make sure to observe the following rules:
14
•
Install your C1 D/A controller on a stable base
•
Do not install your C1 D/A controller near water
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Always handle with care. The C1 D/A controller is quite heavy, so have someone help you when moving it around
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Do not expose the unit to any kind of liquid
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•
Do not install in direct sun light or near any heat source such as radiators or other apparatus generating heat
•
Do not install in a confined space and make sure sufficient air can flow around the unit
•
Do not operate under high ambient temperature (>40°C) or with extremely high humidity such as in humid cellars
•
Only use options and accessories specified or recommended by the manufacturer
•
Do not open the unit nor try to service it by yourself. Do not try to install any option board by yourself. Always refer to a
qualified technician for service, maintenance or upgrades. Failure to do so will void the unit's warranty
2.3 User Manual
Please read this manual carefully before making connections or operating your C1 D/A controller. After reading, store the manual
in an accessible place for future reference. If, after reading this manual, you feel unsure about how to make connections or how to
operate the unit, please contact your authorized dealer.
2.4 Mains supply
Make sure to use 3 terminals (phase, neutral and earth) power cords with ground conductor. Make sure that the mains voltage
selection of the unit matches your mains voltage.
Make sure your C1 D/A controller is disconnected from AC wall power in the following cases:
•
When making connections (it is also recommended to disconnect the rest of the system from AC wall power)
•
When cleaning
•
During thunder storms
•
When unused for a long period
2.5 Transport and packaging
The C1 D/A controller must always be stored in its original packaging for transportation. Doing so will ensure optimal level of
protection of your unit. Therefore, keep all the packaging material in a dry and clean place for future use.
In addition, the transformer base plate must be secured for transportation to avoid excessive constraints on the silent blocks
isolating the chassis from transformer vibrations. This is done by the insertion of a security screw on the bottom of the unit. Do not
forget to install this screw for transportation and to remove it at installation of the unit in its new location.
Finally we recommend to remove the adjustment spikes and to put them into the accessory box for transportation. Indeed,
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vibrations during transport may cause the adjustment spikes to move from their fully retracted position. There is risk of scratching
the installation base if the spikes are not fully retracted when installing the unit.
2.6 Cleaning
Use a soft, dry towel or cloth for cleaning. Never use any solvent or liquids as they may damage the surface treatment or
penetrate inside the unit.
2.7 Maintenance and service
The C1 D/A controller contains no user serviceable parts. Do not try to open, modify or repair your C1 by yourself. This will void
any warranty. Your C1 D/A controller must be checked by a qualified technician in any of the following cases:
16
•
The unit is not functioning properly
•
The mains cable or the power cord receptacle is damaged
•
The unit has been dropped to the floor or presents external damage
•
The C1 D/A controller has been exposed to liquids (such as rain) or unknown substances
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Installation
3.1 Unpacking
Unpack the C1 D/A controller and store the packaging for future transportation. Be careful when lifting the C1 as the unit is heavy
(over 20kg). Get someone to help you if necessary. When unpacking and installing the C1, take care not to damage the high
quality surface treatments.
3.1.1 Removing the security screw
The transformer base plate must be secured during transportation to avoid damage to the isolating silent blocks. The security screw
is located at the bottom of the unit. To remove the security screw, tilt the unit on its side and unscrew. Do not tilt the unit on the
front or back panels as this may damage the user control knob or the connectors.
(1)
Security screw location
(1) Security screw. Must be mounted for transport and removed at installation
3.2 Positioning
Position the C1 unit on a stable base. Make sure cooling air is able to freely flow around the unit.
3.2.1 Unit position adjustment
The C1 D/A controller is equipped with height adjustable feet. More precisely, each feet has an internal height adjustable spike
which can be accessed with the provided adjustment screwdriver through the adjustment shafts. When delivered from factory, the
adjustment spikes are not mounted in the feet but are located in the accessory box. Remove the adjustment spikes from the
accessory box and put one into each adjustment shaft. Place the provided screwdriver into the adjustment shafts and turn clockwise
to secure the spikes and make the required adjustments.
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When the spikes are fully retracted, the C1 sits on elastomer rings to protect the base. If the base on which the C1 is located is
fragile or should not be scratched, please make sure to use the optional CH support discs to protect the base.
( 1)
( 1)
( 2)
( 2)
( 2)
( 2)
( 3)
( 1)
( 3)
( 3)
( 1)
( 3)
( 4)
Adjustment shafts, feet and spikes
(1)
(2)
(3)
(4)
Adjustment shafts. Insert adjustment spikes and use screwdriver to secure and adjust individual feet spikes
Feet
Adjustment spike heads (when inserted into adjustment shafts)
Adjustment spike
3.2.2 Adjustment shaft covers
Once the position of the unit is adjusted, place the appropriate shaft covers on the four adjustment shafts. There are two types of
shaft covers delivered with your C1 unit. One type of shaft cover (stacking cover, made of steel) is used when different CH units
are stacked. This type of cover includes a receptacle to receive the corresponding spike of the unit placed just above. By doing so,
mechanical vibrations are optimally transmitted to ground and minimized inside CH units. The second type of shaft cover (top
cover, made of aluminum) can be used when units are not stacked or for the top unit when stacked. It covers the shaft and
provides a smooth finish to the top of the unit. Shaft covers are located in the accessories box delivered with your C1 unit.
Never stack any component other than CH's on your C1. Never use the aluminum shaft covers (top covers) when another CH
component is to be stacked on top of your C1.
Shaft covers (left: stacking cover, right: top cover)
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C1 User Manual
Rev 1.9
3.3 Connections
This section provides information about how to connect your C1 D/A controller to your system. As the C1 is a modular design with
different optional boards, the description applies to the example configuration presented below. If your options do not match the
example or you don't feel secure with the connections to be applied to your configuration, please contact your authorized dealer
for assistance.
The example configuration is a full featured controller with many inputs (standard digital input AES-EBU, Coaxial and Optical, CHLink, USB and balanced and single-ended analog in) and clock synchronization option (SYNC_IO board). This is one of the most
complete configurations of C1. If your configuration does not include some of the presented options, just discard the corresponding
connections.
(1)
(2)
(15)
(3)
(4)
(5)
(16) (17) (18)
(6)
(7) (8)
(9) (10) (11)
(19) (20) (21)
(22) (23)
(12)
(24) (25)
(13)
(26)
(14)
(27)
Rear panel connections
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
Rev 1.9
75 Ohm RCA single-ended analog output for right channel
50 Ohm BNC single-ended analog output for right channel
75 Ohm RCA single-ended analog output for left channel
50 Ohm BNC single-ended analog output for left channel
BNC clock input. Provides 75Ohm or Hi-Z input. [optional SNYC_IO board]
Ethernet port for command interface [CONTROL board] or for audio streaming and commands [optional NETWORK board]
TOSLINK (S/PDIF) digital input [DIGITAL_IN #1 board]
AES-EBU digital input [DIGITAL_IN #1 board]
USB audio [optional USB_IN board]
RCA single-ended analog input for left channel [optional ANALOG_IN board]
XLR balanced analog input for left channel [optional ANALOG_IN board]
Earth connector. Internally connected to digital ground
External power supply connector for X1 power supply option
Power on/off switch
XLR balanced analog output for right channel
XLR balanced analog output for left channel
BNC 75 Ohm clock output 2. [optional SYNC_IO board]
BNC 75 Ohm clock output 1. [optional SYNC_IO board]
C1 User Manual
19
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
(27)
USB port for software upgrades. [CONTROL board or optional NETWORK board]
CH Link digital input [DIGITAL_IN #1 board]
Coaxial (S/PDIF) digital input [DIGITAL_IN #1 board]
RCA single-ended analog input for right channel [optional ANALOG_IN board]
XLR balanced analog input for right channel. [optional ANALOG_IN board]
Analog ground connector 2
Analog ground connector 1.Can be connected to digital ground (Earth) using provided jumper
Power fuse and voltage selection
Power cord receptacle
The CONTROL board is mandatory in any C1 configuration and is always factory installed. It can be upgraded by an optional
NETWORK board that replaces it, covering all functions of the CONTOL board plus audio streaming capability. Depending on
optional boards and their arrangement in the C1's expansion slots, connector arrangement may differ on your unit. Each C1 unit
provides 4 expansion slots supporting any combination of the following optional boards (note that one slot is dedicated to the
SYNC_IO board):
•
DIGITAL_IN boards (one is already installed in the default C1 configuration) provides 4 digital inputs (coaxial S/PDIF,
optical TOSLINK, AES-EBU and CH-Link)
•
USB_IN boards provides an asynchronous USB audio input
•
ANALOG_IN boards provides 2 pairs (L+R) or analog inputs (balanced XLR and single-ended RCA)
•
SYNC_IO board for external clock synchronization
Note that only one SYNC_IO board is allowed. Optional input boards can be placed in any slot. Installation of optional boards must
be done by a qualified technician only. Do not attempt to install any optional board by yourself as this would void the unit's
warranty.
3.3.1 CONTROL board
The CONTROL board is factory installed into the C1. It provides a USB port for software updates and an Ethernet port for controlling
the unit over a network. Following drawing shows the layout of the back panel of the CONTROL board:
CONTROL board back panel layout
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C1 User Manual
Rev 1.9
3.3.1.1 USB port
The USB port on the CONTROL board is dedicated to the firmware update of the C1 unit. Do not use it for any other purpose. For
more information on unit firmware update, please refer to the corresponding section of this manual.
3.3.1.2 Ethernet port
The Ethernet port on the CONTROL board is dedicated to network based control of the unit. This functionality is currently not
implemented, thus leave the Ethernet port unconnected. A future C1 firmware release will provide this functionality.
3.3.2 NETWORK board
The optional NETWORK board can replace the default CONTROL board. It provides all the features of the CONTROL board (firmware
update USB port, control through RJ45 Ethernet port). But its main feature is to convert the C1 into a network streamer when
connected to a music server through a LAN. Following drawing shows the layout of the back panel of the NETWORK board:
NETWORK board back panel layout
3.3.2.1 USB port
The USB port on the NETWORK board is dedicated to the firmware update of the C1 unit. Do not use it for any other purpose. For
more information on unit firmware update, please refer to the corresponding section of this manual.
3.3.2.2 Ethernet port
The Ethernet port on the NETWORK board has two purposes: music streaming and network-based control of the unit.
3.3.3 DIGITAL_IN boards
DIGITAL_IN boards provide digital audio input capabilities. Additional DIGITAL_IN boards (#2 and #3) can be added to the default
factory installed DIGITAL_IN #1 into C1 to add inputs of each type. DIGITAL_OUT boards provide both standard (AES-EBU, Coaxial
and Optical) digital audio inputs and a proprietary (CH Link) high-definition digital audio interface. Following drawing shows the
layout of the DIGITAL_IN board connectors:
Rev 1.9
C1 User Manual
21
DIGITAL_IN boards back panel layout
3.3.3.1 Standard digital inputs
Each DIGITAL_IN board provides three standard digital inputs: AES-EBU (carrying consumer encoding), Coaxial (S/PDIF) and
Optical (TOSLINK). Audio format supported are 16 or 24 bits, 44.1, 48, 88.2, 96, 176.4, 192 kHz sampling frequency.
3.3.3.2 CH Link digital audio interface
Each DIGITAL_IN board includes a CH Link proprietary digital audio interface. This interface carries both complete audio stream
and control information. Use this link as the preferred interface when connecting your C1 to CH sources such as D1 SACD/CD unit.
The proprietary CH Link digital audio interface allows for high definition uncompressed digital audio transfer and supports both
DSD and PCM (up to 705.6 / 768 kHz). For digital content protection reasons, the native DSD stream is cyphered on the CH Link
interface. Of course, all CH sources (such as D1) and receivers (such as C1) use the same encoding/decoding key.
3.3.4 USB_IN boards
Optional USB_IN board provides connectivity to a USB port of a computer. Audio is sent from the computer to the C1 at a rate that
is synchronous to the C1's precision internal Masterclock. Following drawing shows the layout of the USB_IN board connector:
Asynchronous
High Resolution
USB Audio input
USB In
Inputs #1
USB_IN boards back panel layout
Apple MAC OS X Snow Leopard V10.6.4 or above natively supports USB Audio Class 2.0, allowing 24bits/192kHz files playback.
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C1 User Manual
Rev 1.9
Microsoft Windows (XP, Visa, 7 and 8) so far only supports USB Audio Class 1.0 by default, limiting the playback to 24bit/96kHz
files. Installing the driver provided with optional USB_IN board enables MS Windows computer to support USB Audio Class 2.0,
thus allowing 24bit/192kHz files playback.
DSD files need USB Audio Class 2.0 to be active and they are packed into a 24bit/176.4kHz PCM-like signal for bitstreaming. The
C1 supports the DSD over PCM (DoP1.0) format, automatically unpacks it and converts the DSD bitstream without any loss.
3.3.4.1 Microsoft Windows configuration (XP, Vista, 7 and 8)
Foobar (ASIO)
http://www.foobar2000.org
V1.1, freeware
Configuration
Driver
Required component
Output support
MS Windows OS
USB Audio Class
The C1 USB Audio input should not be the MS Windows default audio output device. In addition, Windows should be configured to
allow applications to get exclusive access to the C1 USB Audio input. Below is a list of recommended media players, drivers and
related configurations to be used with the C1 USB audio input.
Buffer  8s
1.0 XP, Vista, 7, 8 ASIO
foo_asio asio4all
2.0 XP, Vista, 7, 8 ASIO
foo_asio CH USB driver xVyz.zip Output 24bits
J. River Media Center (WASAPI) 1.0 Vista, 7, 8
http://www.jriver.com
V15, commercial
2.0 Vista, 7, 8
WASAPI
EVENT STYLE
-
H/w buffer = 50ms
Output 24bits
WASAPI
EVENT STYLE
-
H/w buffer = 50ms
Output 24bits
Default
J. River Media Center (ASIO)
http://www.jriver.com
V15, commercial
1.0 XP, Vista, 7, 8 ASIO
-
asio4all
2.0 XP, Vista, 7, 8 ASIO
-
CH USB driver xVyz.zip Default
AlbumPlayer (ASIO)
http://www.albumplayer.com
V5.2, commercial
1.0 XP, Vista, 7, 8 ASIO
-
asio4all
2.0 XP, Vista, 7, 8 ASIO
-
CH USB driver xVyz.zip Buffer = 2048 samples
Buffer = 2048 samples
Recommended media players, drivers and related configurations
3.3.5 ANALOG_IN boards
ANALOG_IN boards provide analog audio input capabilities. Even though the C1 is primarily a high grade digital to analog
converter, adding one or two ANALOG_IN boards turns it into a complete preamplifier with both analog and digital inputs. Each
ANALOG_IN board adds one RCA single-ended analog input pair and one XLR balanced analog input pair.
In order to achieve optimum performance from an analog source, the ANAOLG_IN board converts the incoming analog audio
signal into a high resolution digital audio stream (5.6448MHz DSD2x) synchronously to its digital to analog output conversion
stage. The volume control is also achieved by an optimized combination of analog attenuators and high precision 32 bits floating
point multiplication in the digital domain. Following drawing shows the layout of an ANALOG_IN board connector:
Rev 1.9
C1 User Manual
23
ANALOG_IN panel layout
3.3.6 SYNC_IO board
The SYNC_IO board is an optional clock synchronization board to be used with an external clock generator or together with other
CH products, such as the D1 SACD/CD unit. The board provides one clock input and two clock output on BNC connectors. Each VCXO
digital PLL (one is based on a 22.5792 MHz Masterclock and the other one on a 24.576 MHz Masterclock) of the C1 is capable of
frequency and phase locking. The frequency is tracked below 0.1 Hz with 0.1 PPM adjustments for optimal jitter rejection. When
fed with an audio Wordclock, the C1's internal clock will always keep a phase accuracy below 2.5 us (equivalent to sub-millimeter
position accuracy), thus enabling phase perfect match in a multichannel configuration. Following diagram shows the layout of the
back panel of the SYNC_IO board:
SYNC_IO board back panel layout
3.3.6.1 BNC clock input
The SYNC_IO board provides a BNC clock input that can be configured as 75 Ohm input impedance or high input impedance
through the C1's menu. Supported input frequencies on this connector are all standard audio Wordclocks (44.1, 48, 88.2, 96,
176.4 and 196 kHz), audio Masterclocks (22.5792 and 24.576 MHz), DSD bitclock (2.8224 MHz) and atomic-clock multiples (100
kHz and 10 MHz). Use this connector to synchronize your C1 unit to an external clock source (atomic clock generator or external
source such as CH D1).
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C1 User Manual
Rev 1.9
3.3.6.2 BNC clock outputs
Two 75 Ohm output clock connectors are also provided on the SYNC_IO board. Use one of these connectors to synchronize an
external device to your C1. Output clock is either a buffered version of input clock (if C1 is synchronized to it input clock), or
current audio Wordclock (if C1 is clocked by its internal high precision oscillator).
3.3.7 Power cord receptacle and voltage selection
Make sure that the voltage selection is set to the correct value with respect to the AC voltage in your location. Connect the power
cord to the power cord receptacle and plug the power plug to an AC wall outlet only after all other connections have been made.
3.3.8 External power supply connector
The external power supply connector allows you to connect the X1 optional external power supply from CH. When the X1 is used, it
completely replaces the C1's internal power supply, resulting in minimized noise and enhanced audio quality. Note that only the
(small) standby transformer of the C1 remains active in this case to ensure the C1's wake up functionality.
Rev 1.9
C1 User Manual
25
4
Operation
The C1 D/A controller is operated either from the front panel or from the IR remote control. Feedback to the user is provided by a
high-definition AMOLED display with customizable colors. Setup operations are exclusively handled from the front panel.
4.1 Front panel controls
4.1.1 Front panel
(1)
(2)
(3)
(4)
Front panel elements
(1)
(2)
(3)
(4)
Standby LED
User control knob (dual concentric rotatory knob with push function)
IR remote control receiver
Display area (high-definition AMOLED display
The standby LED lights up when the unit is in standby. It is normally turned-off during operation and shortly lights up whenever it
receives a valid IR remote control command. The LED can also be programmed to remain on during operation if the display is
turned off. The display is a high-definition AMOLED panel with very wide viewing angle, high contrast and high brightness ensuring
optimal reading comfort. The color and brightness of the display can be configured according to user's taste and different colors
can be chosen for PCM (e.g. CD and most computer audio files format) or DSD (SACD format) playback.
4.1.2 User control knob
The user control knob is the main user input device. It is build around a dual concentric rotatory knob with push function, mounted
on a Teflon guide. Both the central and the external part of the knob can be moved to the left or the right independently, giving
four movements: rotate External Rotate Left/Right [<<E]/[E>>] and Central Rotate Left/Right [<<C]/[C>>]. The central part of
the knob also supports a push functionality. There are two types of push: Normal Push [NP] and Long Push [LP]. For a Normal
Push, just press the central part of the knob and release it immediately. For a Long Push, press and hold the central part of the
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C1 User Manual
Rev 1.9
knob for 2s or more.
( 1)
( 4)
( 2)
( 5)
( 3)
User control knob movements
(1)
(2)
(3)
(4)
(5)
External ring rotate Left [<<E]
Central knob rotate Left [<<C]
Central knob push. There are two types of push: Normal Push [NP] and Long Push [LP]
External ring rotate Right [E>>]
Central knob rotate Right [C>>]
User Action Code
Description
[<<C]
Central Left: Rotate central knob to the left
[C>>]
Central Right: Rotate central knob to the right
[<<E]
External Left: Rotate external ring to the left
[E>>]
External Right: Rotate external ring to the right
[NP]
Normal Push: push and release central knob
[LP]
Long Push: push central knob and maintain for 2s before release
User Action Codes
Rev 1.9
C1 User Manual
27
4.2 Operating modes
The C1 D/A controller has two main operating modes: Normal mode and Menu mode. Normal mode is used to access standard
preamplifier controls whereas Menu mode is used to configure the unit. The C1 also includes Shortcuts for quick access to selected
Menu mode items. Shortcuts are user programmable and most Menu mode items can be selected as Shortcuts.
4.2.1 Normal mode
Normal mode is used for standard preamplifier functions. When powered-on, the C1starts in Normal mode. The display looks as
follows:
(1)
(2)
44.1 > 705.6 kHz
(8)
(7)
7 -18.5 dB
(3)
AES EBU 1
<H
J AUDIO IN
(6)
(4)
(5)
Normal mode display elements
(1) Incoming audio sampling frequency (first number, replaced by “DSD” when playing an SACD DSD layer through CH Link) and DSP output
frequency (either 705.6 or 768 kHz) feeding conversion chips. Shows the over-sampling (or DSD to PCM conversion) performed by the C1's
DSPs.
(2) Mute indication. If the 7 symbol is present, the output is muted
(3) Analog output level. Only displayed when C1 is used as a preamplifier. When C1 is used as a pure DAC (selectable through C1's menu), output
level is set to 0 dB and not mentioned in this display area.
(4) Polarity (phase) indication. If the H symbol is present, polarity is reversed
(5) External power supply indication. When an external power supply is connected and engaged, < symbol is displayed and internal power supply is
turned off
(6) Clock source indication (internal, audio in, or clock frequency when an external clock is selected as the clock source)
(7) Lock indication (J or K). Tells if the unit is locked to a clock source or not
(8) Input source name. Each input source can be renamed through C1's menu
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C1 User Manual
Rev 1.9
Displayed elements depend on the installed optional boards and user settings. In the example above, C1 is playing the audio
coming from its first AES-EBU input at the rate of 44.1 kHz, over-sampling it to 705.6 kHz (x16). The output level is -18.5 dB, but
is currently muted. C1 has locked its 22.5792 MHz (512 x 44.1 kHz) VCXO to the incoming audio stream. The polarity of the
audio signal is inverted, and the C1 is powered through its external DC power supply. Displayed elements for other configurations
are similar.
Following table shows the actions of the user control knob in Normal mode.
User Control Knob Action
Unit State
Unit Action
[NP] Normal Push
STANDBY
Any other state
Wake from STANDBY
Enter Shortcuts mode
[LP] Long Push
STANDBY
Any other state
Wake from STANDBY
Go to STANDBY
[C>>] Center Rotate Right
D/A Controller (preamplifier)
D/A Converter (pure DAC)
Increase volume (1st by 0.5 dB steps, then faster)
Select next available input
[<<C] Center Rotate Left
D/A Controller (preamplifier)
D/A Converter (pure DAC)
Decrease volume (1st by 0.5 dB steps, then faster)
Select previous available input
[E>>] External Rotate Right
Any state
Select next available input
[<<E] External Rotate Left
Any state
Select previous available input
User control knob actions in Normal mode
4.2.2 Shortcuts
The C1 D/A controller is configured by a set of menus as described in the next sections. To allow quick access to the most
frequently used configuration menu items, the C1 offers the concept of Shortcuts. Shortcuts are fully programmable and the user
may choose any configuration parameter as a Shortcut. There are up to 6 user programmable Shortcuts. To learn how to program
individual Shortcuts, please refer to the SHORTCUTS menu item in the next section. For a list of Factory default Shortcuts, please
refer to the Specifications section.
Shortcuts are accessed from Normal mode by a Normal Push [NP]. Additional Normal Push [NP] skips to the next Shortcut. The last
Shortcut is always dedicated to entering the Menu mode (SETUP). On this last Shortcut, a Normal Push [NP] will return to Normal
Mode and an External Rotate Right [E>>] (or Central Rotate Right [C>>]) will enter the Menu mode. The individual parameter for
a given Shortcut is modified using External Rotate Left [<<E] (or Central Rotate Left [<<C]) and/or External Rotate Right [E>>]
(or Central Rotate Right [C>>]) . If there is no user action for about 10s the unit will revert to Normal mode.
Following table shows the actions of the user control knob for Shortcuts.
User Control Knob Action
Unit State
[NP] Normal Push
Shortcut (except last)
Skip to next Shortcut
Last Shortcut (SETUP) or Exit Shortcuts mode (Normal mode)
after current Shortcut
has been modified
Rev 1.9
Unit Action
C1 User Manual
29
[LP] Long Push
Any state
As in Normal mode
[C>>] Central Rotate Right
Shortcuts (except last)
Last Shortcut (SETUP)
Modify parameter up (when available)
Enter Menu mode
[<<C] Central Rotate Left
Shortcuts
Modify parameter down (when available)
[E>>] External Rotate Right
Shortcuts (except last)
Last Shortcut (SETUP)
Modify parameter up (when available)
Enter Menu mode
[<<E] External Rotate Left
Shortcuts
Modify parameter down (when available)
User control knob actions for Shortcuts
The PHASE POLARITY Shortcut gives a good illustration of how to navigate a Shortcut screen. Navigating other Shortcuts is similar.
(1)
PHASE POLARITY INVERSION
(6)
(5)
A
IN PHASE
...
C
OUT OF PHASE
(2)
(3)
(4)
PHASE POLARITY Shortcut display elements
(1)
(2)
(3)
(4)
(5)
(6)
Shortcut title (Parameter, for other Shortcuts, title changes accordingly)
Arrow indicating External Rotate Right [E>>] if applies. The item below indicates the next parameter value (up direction)
Next Parameter Value if External Rotate Right [E>>] is applied (parameter up)
Current Parameter Value (for other Shortcuts the current Value of the Parameter is displayed on this line)
Next parameter value if External Rotate Left [<<E] is applied (parameter down)
Arrow indicating External Rotate Left [<<E] if applies. The item below indicates the next parameter value (down direction)
The last Shortcut (SETUP) is always the same and cannot be removed or altered. It gives access the Menu mode to access the
detailed setup of the unit.
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C1 User Manual
Rev 1.9
(1)
DETAILED SETUP
EXIT
(2)
C
ENTER
(3)
(4)
SETUP Shortcut display elements
(1)
(2)
(3)
(4)
Shortcut title. It indicates that Detailed Setup (Menu mode) can be entered at this stage
Current value of the parameter. Default action is to exit (go back to Normal mode)
Arrow indicating External Rotate Right [E>>] (or Central Rotate Right [C>>])
Next parameter value. If External Rotate Right [E>>] is applied, the unit enters into Menu mode
4.2.3 Menu mode
The Menu mode allows for Configuration and Setup of the C1 D/A controller through a set of menus. Menu mode is entered from
the last Shortcut item (see above). From Normal mode, enter the Shortcut mode by applying a Normal Push [NP]. By successive
Normal Pushes [NP], step to the last Shortcut item (DETAILED SETUP) and apply an External Rotate Right [E>>] to enter the Menu
mode.
Navigation in Menu mode is based on Central Rotate Left/Right [<<C]/[C>>] to select a given menu item and External Rotate
Left/Right [<<E]/[E>>] to change menu level.
User Control Knob Action
Unit Action
[NP] Normal Push
Enter next menu level or Validate choice (save setting)
[LP] Long Push
Puts the unit into Standby
[C>>] Center Rotate Right
Move to next menu item downward
[<<C] Center Rotate Left
Move to next menu item upward
[E>>] External Rotate Right
Enter next menu level
[<<E] External Rotate Left
Return to previous menu level without saving
User control knob actions in Menu mode
Rev 1.9
C1 User Manual
31
Following illustration shows the elements of a the C1 SETUP Menu page, the entry point to the C1 menu structure.
(1)
C1 SETUP
AUDIO SETTING
DISPLAY SETTING
SHORTCUTS
FACTORY SETTING
FACTORYSETTING
INSTALLED OPTIONS
NETWORK
> Mute
Phase polarity
Clock source
Active input
Input gain
C
(3)
(2)
C1 SETUP menu display elements
(1) Menu title. When entering a menu item, the title also shows the parent menu. If the AUDIO SETTING menu is entered, the title line would display
C1 SETUP >> AUDIO SETTING.
(2) Shows the accessible parameters when entering the currently highlighted menu item. In this example, AUDIO SETTING is highlighted and the
second column shows the parameters accessible in the AUDIO SETTING menu.
(3) List of items in the current menu. Navigate from one item to the other using Central Rotate Left/Right [<<C]/[C>>]. To enter the highlighted
menu item, use External Rotate Right [E>>] (or a Normal Push [NP]). To go to the previous menu level use External Rotate Left [<<E]. In this
example, External Rotate Left [<<E] exits the Menu mode and sets the unit back to Normal mode.
Once a menu item is selected by External Rotate Right [E>>], parameters for the corresponding menu item can be navigated and
accessed. As an example, the following drawing shows the display elements of the C1 SETUP >> AUDIO SETTING sub-menu.
(1)
C1 SETUP >> AUDIO SETTING
(5)
MUTE
PHASE POLARITY
CLOCK SOURCE
ACTIVE INPUT
...
Unmuted
In phase
...
...
(4)
(2)
(3)
C1 SETUP >> AUDIO SETTING menu display elements
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C1 User Manual
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(1) Menu title. C1 SETUP >> AUDIO SETTING shows that the parent menu is C1 SETUP. By applying External Rotate Left [<<E], the unit returns to the
parent menu.
(2) A Parameter Value of '...' indicates that the menu items gives access to one or more further sub-menu(s). Further sub-menus have the same
structure as this example.
(3) This is the Parameter Value column. For each item in the Parameter column, the Parameter Value item on the same line indicates the current
value of the Parameter.
(4) This is the Parameter column. The currently active Parameter is highlighted. Use Central Rotate Left/Right [<<C]/[C>>] to navigate from
Parameter to Parameter.
(5) If the first or last item in the Parameter column is indicated by '...' it means that there are additional Parameters not displayed currently onscreen. Use Central Rotate Left/Right [<<C]/[C>>] to navigate towards the '...' to make the corresponding Parameters appear on screen.
Once a terminal Parameter (e.g. a Parameter not giving access to a further sub-menu) is selected by External Rotate Right [E>>],
the C1 displays the corresponding Parameter adjustment screen. Following example shows the AUDIO SETTING >> PHASE
POLARITY Parameter adjustment screen. Other Parameters are similar but may show more (or less) choices for Parameter value.
Once a Parameter is set to the desired value, a Normal Push [NP] saves the new Parameter Value and gets back to the parent level
(save and exit). On the other hand, an External Rotate Left [<<E] gets back to the parent menu (in the case of this example:
AUDIO SETTING), but possible modifications of the Parameter Value are discarded (exit without saving).
(1)
AUDIO SETTING >> PHASE POLARITY
(4)
PHASE POLARITY
In phase
Out of phase
(2)
(3)
AUDIO SETTING >> PHASE POLARITY menu display elements
(1) Menu title. AUDIO SETTING >> PHASE POLARITY shows that the parent menu is AUDIO SETTING. To access the parent menu, use External Rotate
Left [<<E]
(2) The current Parameter Value is highlighted. Use Central Rotate Left/Right [<<C]/[C>>] to navigate through Parameter Values
(3) Other possible Parameter Value(s). Number of other Parameter Value(s) depends on Parameter
(4) Parameter for which the Parameter Value can be modified in the current menu.
The following section gives detailed information about the menu structure and the various Parameters. Note that certain Parameter
may or may not appear in the menu depending on installed options. For instance if no ANALOG_IN board is installed, menu items
related to the RCA and XLR inputs (enable, gain, renaming) do not appear in the menu.
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4.3 Configuration
Configuration of your C1 D/A controller is accomplished by setting parameters in the Menu mode (see previous section for how to
access Menu mode and how to navigate menu items). Following diagram shows the complete menu structure (terminal items not
show). Grayed menu items are items which depend on installed optional slot-in boards.
Normal mode
CH-LINK 1
Shortcut mode
SHORTCUT 1
SHORTCUT 2
C1 SETUP
C1 SETUP >>
AUDIO SETTING
Menu mode
SHORTCUT N
EXIT
ENTER
AUDIO SETTING >>
MUTE
AUDIO SETTING >>
PHASE POLARITY
C1 SETUP >>
SET ENCODER
CUSTOMIZE ENCODER >>
SHORTCUT 1
AUDIO SETTING >>
CLOCK SOURCE
CLOCK SOURCE >>
INPUT
CUSTOMIZE ENCODER >>
SHORTCUT 2
AUDIO SETTING >>
INPUT TYPE
INPUT TYPE >>
INPUT
CUSTOMIZE ENCODER >>
SHORTCUT 3
AUDIO SETTING >>
INPUT GAIN
INPUT GAIN >>
INPUT
CUSTOMIZE ENCODER >>
SHORTCUT 4
AUDIO SETTING >>
BALANCE
CUSTOMIZE ENCODER >>
SHORTCUT 5
AUDIO SETTING >>
MONO MODE
CUSTOMIZE ENCODER >>
SHORTCUT 6
AUDIO SETTING >>
PCM FILTER TYPE
AUDIO SETTING >>
DSD FILTER TYPE
AUDIO SETTING >>
C1 TYPE
AUDIO SETTING >>
MAX START VOL
AUDIO SETTING >>
MAX VOLUME
AUDIO SETTING >>
USB AUDIO CLASS
AUDIO SETTING >>
USB AUDIO POWER
AUDIO SETTING >>
PHONO CURVE
SETUP >>
DISPLAY SETTING
C1 SETUP >>
FACTORY SETTING
FACTORY SETTING >>
FIRMWARE VERSION
FACTORY SETTING >>
UPDATE FIRMWARE
DISPLAY SETTING >>
DISPLAY TYPE
DISPLAY SETTING >>
LED ON/OFF
EDIT CUSTOM >>
RED
DISPLAY SETTING >>
BRIGHTNESS PCM
EDIT CUSTOM >>
GREEN
DISPLAY SETTING >>
COLOR PCM
FACTORY SETTING >>
SERIAL NUMBER
COLOR PCM >>
EDIT CUSTOM
DISPLAY SETTING >>
BRIGHTNESS DSD
FACTORY SETTING >>
RESET ALL SETTING
DISPLAY SETTING >>
COLOR DSD
FACTORY SETTING >>
SHORTCUTS
EDIT CUSTOM >>
RED
COLOR DSD >>
EDIT CUSTOM
DISPLAY SETTING >>
BRIGHTNESS ANALOG
FACTORY SETTING >>
INPUT ENABLED
FACTORY SETTING >>
INPUT GAIN
FACTORY SETTING >>
INPUT NAMES
EDIT CUSTOM >>
BLUE
EDIT CUSTOM >>
GREEN
EDIT CUSTOM >>
BLUE
DISPLAY SETTING >>
COLOR ANALOG
COLOR ANALOG >>
EDIT CUSTOM
EDIT CUSTOM >>
RED
DISPLAY SETTING >>
INPUT RENAMING
INPUT RENAMING >>
INPUT
EDIT CUSTOM >>
GREEN
EDIT CUSTOM >>
BLUE
FACTORY SETTING >>
REMOTE CONTROL
FACTORY SETTING >>
CALIBRATE
FACTORY SETTING >>
NETWORK
C1 SETUP >>
INSTALLED OPTIONS
C1 SETUP >>
NETWORK
NETWORK >>
STATUS
NETWORK >>
CONFIGURE
NETWORK >>
ANNOUNCE
INSTALLED OPTIONS >>
SYNCHRO
INSTALLED OPTIONS >>
ETHERNET
INSTALLED OPTIONS >>
SLOT 1
INSTALLED OPTIONS >>
SLOT 2
INSTALLED OPTIONS >>
SLOT 3
C1 D/A controller menu structure
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There are six main menus used for configuration of the C1:
•
AUDIO SETTING: Allows to adjust audio related parameters
•
DISPLAY SETTING: Allows to adjust display related parameters
•
SHORTCUTS: Allows to assign and modify Shortcuts for user interface customization
•
FACTORY SETTING: Indicates the software version and allows to update it. Also allows to return to factory settings and
calibrate the C1
•
INSTALLED OPTIONS: Provides information about the installed optional slot-in boards
•
NETWORK: Provides information about the network setup and enables its configuration
4.3.1 C1 configuration menu items
4.3.1.1 AUDIO SETTING
C1 SETUP >> AUDIO SETTING
MUTE
PHASE POLARITY
CLOCK SOURCE
INPUT TYPE
...
Unmuted
In phase
...
...
The C1 SETUP >> AUDIO SETTING menu allows configuration of the audio related
Parameters of the unit. Accessible Parameters are:
- MUTE:
Mutes or unmutes the audio output
- PHASE POLARITY: Allows to revert the phase of the audio output
- CLOCK SOURCE:
Allows to select the clock source for each input
- INPUT TYPE:
Selects if an input is hidden, and/or volume controlled.
- INPUT GAIN:
Sets individual gain/attenuation per input
- BALANCE:
+/-6dB L/R balance correction
- MONO MODE:
Allows to route left (resp. right) input to both outputs
- PCM FILTER TYPE: Digital filter selection for PCM audio
- DSD FILTER TYPE: Digital filter selection for DSD audio
- C1 TYPE:
Enables volume control
- MAX START VOL:
Sets maximum allowed volume at startup in controller
mode
- MAX VOLUME:
Sets maximum allowed volume in controller mode
- USB AUDIO CLASS: Select class 1.0 (96/24 max) or class 2.0 (192/24 max)
- USB AUDIO POWER: Allows USB audio section power off when unused
- PHONO CURVE:
Selects correction curve for phono input board
The following table details the Parameters of the AUDIO SETTING menu:
PARAMETER
PARAMETER VALUES
REQUIRED OPTIONS
REMARKS
MUTE
Muted
None
None
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Unmuted
PHASE POLARITY
In phase
Out of phase
None
None
CLOCK SOURCE
(individually
selectable for each
input)
Audio In
SYNC_IO board to
Internal Clock
choose some of these
Synchro BNC (75 Ohm) clock sources
Synchro BNC (Hi-Z)
SRC
Audio In clock source is available in all cases for
digital in board inputs.
SRC adds an asynchronous sample rate converter
stage that allows the C1 to lock even on S/PDIF
sources that do not comply with AES requirements.
Internal Clock is the the default choice for computer
sources (USB audio and Ethernet streaming) where
C1 is the clock master.
Synchro BNC (75 Ohm) and Synchro (Hi-Z) are only
available when the SYNC_IO board is installed.
SYNC_IO offers choice of 75 Ohm or highimpedance on its BNC clock input.
INPUT TYPE
Disabled
Normal
Processor
“Disabled” inputs cannot be selected anymore when
scrolling though inputs (with remote control or
encoder).
For “Processor” inputs, the C1's volume control (in
processor mode) is not applied (no attenuation!)
Only available inputs (depends on hardware
configuration) can be enabled/disabled in the menu
INPUT GAIN
(individually
selectable for each
input)
-6 dB to +6 dB by 0.5
dB steps
None
None
BALANCE
Left +6 dB to Right +6
dB by 0.5 dB steps
None
None
MONO MODE
Stereo
Mono Left
Mono Right
None
When “Mono Left” (respectively “Mono Right”) is
selected, the left (respectively right) audio input is
mapped to bot C1's outputs
PCM FILTER TYPE
Minimum Phase
Linear P. apodising
Linear P. sharp
None
Choice of different filter types for PCM audio input.
Linear P. indicates linear phase.
Sharp corresponds to a steep cut-off. Apodising
filters reach full attenuation at half the sampling
frequency to minimize transition band aliasing.
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DSD FILTER TYPE
Minimum Phase
Linear P. apodising
Linear P. sharp
None
None
Choice of different filter types for DSD audio input.
C1 TYPE
D/A Controller
D/A Converter
Connected to power amp When C1 is configured as D/A Converter, its output
Connected to preamp
volume is not attenuated (0dB). This setting should
only be selected if C1 is used with an external
preamplifier (or integrated amplifier)
MAX START VOL
-50 dB to -20 dB by 10 None
dB steps
The startup volume is the lowest of the following:
- Last listening volume before standby
- MAX START VOL parameter value
MAX VOLUME
-30 dB to 0 dB by 10 dB None
steps, or no limitation
(up to +24 dB)
Limits the output volume of the C1 in controller
mode
USB AUDIO CLASS
1.0 or 2.0
USB_IN #1 / #2
More detail in chapter 3.3.4 USB_IN boards
USB AUDIO POWER
Auto shutdown or
Keep USB powered
USB_IN #1 / #2
Auto shutdown allows automatic power off of the
USB audio board (including its DSP) when another
input is selected to minimize noise. In that case, the
computer looses connection to the C1 and its
playback will stop as another input is selected.
Keep USB powered allows quick switching from
another input to the USB audio input, as it keeps
processing when another input is selected in the C1.
PHONO CURVE
RIAA
RIAA EXT
OEC 250
OEC 500
COLUMBIA N78
COLUMBIA LP M33
NAB
NARTB
AES
LGC DECCA
CCIR 134
IEC
RCA IEC98
TELDEC
PHONO_IN
Enable to select the optimum phono correction curve
for each record
Linear P. indicates linear phase.
Sharp corresponds to a steep cut-off. Apodising
filters reach full attenuation at half the sampling
frequency to minimize transition band aliasing.
Details of AUDIO SETTING menu Parameters
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4.3.1.2 DISPLAY SETTING
The C1 SETUP >> DISPLAY SETTING menu allows configuration of the display
related Parameters of the unit. Accessible Parameters are:
- DISPLAY TYPE:
Allows to chose what to display
- LED ON/OFF:
Selects if the LED is turned on when the display is off
- BRIGHTNESS PCM: Sets the display brightness for PCM playback
- COLOR PCM:
Selects the display color for PCM playback
- BRIGHTNESS DSD: Sets the display brightness for DSD playback
- COLOR DSD:
Selects the display color for DSD playback
- BRIGHTNESS ANALOG: Sets the display brightness for analog source playback
- COLOR ANALOG:
Selects the display color for analog source playback
- INPUT RENAMING: To customize the name of any input
The following table details the Parameters of the DISPLAY SETTING menu:
PARAMETER
PARAMETER VALUES
REQUIRED OPTIONS
REMARKS
DISPLAY TYPE
Input
Off
Volume
None
Allows to chose what to display by default: The input
name, nothing, or the C1's volume
LED ON/OFF
On
Off
None
If the display is turned off, setting the LED ON/OFF
Parameter to On will make sure the LED in the logo
remains lit during operation.
If the LED ON/OFF Parameter is set to Off, the LED
will turn off during operation whatever the value of
the DISPLAY ON/OFF parameter.
BRIGHTNESS PCM
COLOR PCM
10%
20%
30%
...
90%
100%
None
Predefined colors
Custom color
Edit custom color
None
Sets the display brightness when a PCM audio
stream is played.
The C1 supports three different display settings
(BRIGHTNESS and COLOR parameters). One used
during PCM playback, one used during DSD
playback and one used when playing an analog
source
Selects the display color for PCM playback
Predefined colors represents a set of factory defined
colors
Custom color is a user definable color. To Edit the
custom color select the Edit custom color Value. Submenus allow to individually configure Red, Green
and Blue components (RGB) of the custom color.
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BRIGHTNESS DSD
COLOR DSD
10%
20%
30%
...
90%
100%
None
Predefined colors
Custom color
Edit custom color
None
Sets the display brightness when a DSD audio
stream is played.
The C1 supports three different display settings
(BRIGHTNESS and COLOR parameters). One used
during PCM playback, one used during DSD
playback and one used when playing an analog
source
Selects the display color for DSD playback
Predefined colors represents a set of factory defined
colors
Custom color is a user definable color. To Edit the
custom color select the Edit custom color Value. Submenus allow to individually configure Red, Green
and Blue components (RGB) of the custom color.
BRIGHTNESS ANALOG 10%
20%
30%
...
90%
100%
COLOR ANALOG
ANALOG_IN or
PHONO_IN
Sets the display brightness when an analog input is
played back
The C1 supports three different display settings
(BRIGHTNESS and COLOR parameters). One used
during PCM playback, one used during DSD
playback and one used when playing an analog
source
Predefined colors
Custom color
Edit custom color
ANALOG_IN or
PHONO_IN
Selects the display color for analog input playback
Predefined colors represents a set of factory defined
colors
Custom color is a user definable color. To Edit the
custom color select the Edit custom color Value. Submenus allow to individually configure Red, Green
and Blue components (RGB) of the custom color.
INPUT RENAMING
Any string
None
Used to rename any input in the C1
Details of DISPLAY SETTING menu Parameters
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4.3.1.3 SHORTCUTS
The C1 SETUP >> SHORTCUTS menu allows configuration of the Shortcuts.
Accessible Parameters are:
- SHORTCUT1:
Defines action for Shortcut #1
- SHORTCUT2:
Defines action for Shortcut #2
- SHORTCUT3:
Defines action for Shortcut #3
- SHORTCUT4:
Defines action for Shortcut #4
- SHORTCUT5:
Defines action for Shortcut #5
- SHORTCUT6:
Defines action for Shortcut #6
Note that unused Shortcuts are not displayed. The first available (e.g. non
defined) Shortcut has a Parameter Value of 'None' (the example on the left has
4 defined Shortcuts, hence Shortcut #5 has a Parameter Value of 'None')
The following table details the Parameters of the SHORTCUTS menu:
PARAMETER
PARAMETER VALUES
REQUIRED OPTIONS
REMARKS
SHORTCUT 1
Any Parameter of the
None
AUDIO SETTING and
DISPLAY SETTING menus
or None
If SHORTCUT 1 is not defined, Parameter value for
SHORTCUT 1 is set to 'None'. SHORTCUT 2 to 6 are
not displayed in this case.
SHORTCUT 2
Any Parameter of the
None
AUDIO SETTING and
DISPLAY SETTING menus
or None
If SHORTCUT 2 is not defined, Parameter value for
SHORTCUT 2 is set to 'None'. SHORTCUT 3 to 6 are
not displayed in this case.
SHORTCUT 3
Any Parameter of the
None
AUDIO SETTING and
DISPLAY SETTING menus
or None
If SHORTCUT 3 is not defined, Parameter value for
SHORTCUT 3 is set to 'None'. SHORTCUT 4 to 6 are
not displayed in this case.
SHORTCUT 4
Any Parameter of the
None
AUDIO SETTING and
DISPLAY SETTING menus
or None
If SHORTCUT 4 is not defined, Parameter value for
SHORTCUT 4 is set to 'None'. SHORTCUT 5 and 6 are
not displayed in this case.
SHORTCUT 5
Any Parameter of the
None
AUDIO SETTING and
DISPLAY SETTING menus
or None
If SHORTCUT 5 is not defined, Parameter value for
SHORTCUT 5 is set to 'None'. SHORTCUT 6 is not
displayed in this case.
SHORTCUT 6
Any Parameter of the
None
AUDIO SETTING and
DISPLAY SETTING menus
or None
If SHORTCUT 6 is not defined, Parameter value for
SHORTCUT 6 is set to 'None'.
Details of SHORTCUTS menu Parameters
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4.3.1.4 FACTORY SETTING
The C1 SETUP >> FACTORY SETTING menu allows to get information about
current C1 firmware version, to update the C1 firmware, to reset the unit to
default configuration (or subset of setting), and to calibrate the DAC stage.
Accessible Parameters are:
- FIRMWARE VERSION: Current firmware version (read only)
- UPDATE FIRMWARE: Allows to update the unit's firmware
- RESET ALL SETTING: Returns the unit to factory settings
- SERIAL NUMBER: Displays the serial number of the machine
- SHORTCUTS:
Redefines all Shortcuts to factory settings
- INPUT ENABLED:
Allows to enable all digital inputs at once
- INPUT GAIN:
Reset all input gain to 0 dB
- INPUT NAMES:
Put back default name to all inputs
- REMOTE CONTROL: Select to which set of RC5 commands the C1 responds
- CALIBRATE:
Run auto-calibration process
- NETWORK:
Clears list of detected devices on network
The following table details the Parameters of the FACTORY SETTING menu:
PARAMETER
RELATED ACTION/VALUE REQUIRED OPTIONS
REMARKS
FIRMWARE VERSION
Firmware version
None
Firmware version indicates the version of the
current firmware. Format is x.y. This parameter is
read only.
UPDATE FIRMWARE
Update
None
Selecting 'Update' launches the C1 firmware update
process. A USB flash disc drive with a valid set of
firmware must be inserted in the A-shaped USB port
RESET ALL SETTING
Reset
None
Selecting 'Reset' returns the C1 to its factory
settings. Factory settings are detailed in the
Specifications section.
SERIAL NUMBER
Serial number
None
Serial number indicates the serial number of the C1.
Format is yymm02nn. This parameter is read only.
SHORTCUTS
Default mapping
None
Selecting 'Default Mapping' returns the C1's
Shortcuts to their factory settings. Factory settings
are detailed in the Specifications section.
INPUT ENABLE
Enable all
None
Selecting 'Enable all' will enable all available
C1inputs.
INPUT GAIN
Set default gain
None
Set back the gain/attenuation of all inputs to 0dB.
INPUT NAMES
Default names
None
Set back all input names to their default value
REMOTE CONTROL
None
RC5 Pre1
RC5 Pre2
None
Selects to which set of RC5 commands the C1 will
respond to. Pre1 is the standard RC5 Preamplifier
set, Pre2 is an alternate RC5 Preamplifier set (it
corresponds to the set of commands the C1 remote
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control sends by default). When 'None' is selected,
the C1 cannot be controlled by a remote control
anymore.
CALIBRATE
Start calibration
C1 should be warmed-up Launch automated calibration left and right channel
DAC stage. It takes about 40s per channel to
complete. For optimal performances, please make
sure the C1 is warmed-up (i.e. turned on for more
than an hour) before running calibration.
NETWORK
Reset
None
Clears the C1's memory of other CH Precision
devices it has discovered through the TCP/UDP
proprietary protocol.
Details of FACTORY SETTING menu Parameters
4.3.1.5 INSTALLED OPTIONS
The C1 SETUP >> OPTIONS menu provides read-only information about installed
slot-in boards. Details are:
- SYNCHRO:
Synchronization option installed
- ETHERNET:
Board type in the Ethernet slot: CONTOL (default) or
NETWORK (streaming option)
- SLOT 1:
Input board installed in Slot 1
- SLOT 2:
Input board installed in Slot 2
- SLOT 3:
Input board installed in Slot 3
Each slot indicates the type of board it handles. A '-' indicates that the slot is
currently unpopulated.
The following table details the Parameters of the INSTALLED OPTIONS menu:
PARAMETER
PARAMETER VALUES
REQUIRED OPTIONS
REMARKS
SYNCHRO
Clock In/Out
-
SYNC_IO board
Reports the presence of the SYNC_IO board in the
corresponding slot. If SYNC_IO is not installed, the
Parameter reads '-'.
ETHERNET
Control
Network
CONTROL board
NETWORK board
Reflect which board type populates the Ethernet
slot. This slot has to be populated, by one of these
two boards.
SLOT 1
SLOT 2
SLOT 3
Digital In 1/2/3
USB In 1/2
Analog In 1/2
Phono MC 1/2
-
At least 1x DIGITAL_IN
Parameters report which type of board
(DIGITAL_IN, USB_IN, ANALOG_IN or none) are
installed in the different slots.
'-' indicates that no board is installed in the given
slot.
Parameters are Read Only
Details of INSTALLED OPTIONS menu Parameters
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4.3.1.6 NETWORK
The C1 SETUP >> NETWORK menu allows knowledge and customization of the
network related Parameters of the unit. Accessible Parameters are:
- STATUS:
Listing of all CH products detected (product type, IP and
MAC addresses
- CONFIGURE:
Defines if the C1 should interact with the network as the
master, slave or not (offline)
- ANNOUNCE:
Forces the C1 to send a broadcast message on the local
network to announce itself
The following table details the Parameters of the NETWORK menu:
PARAMETER
PARAMETER VALUES
REQUIRED OPTIONS
REMARKS
STATUS
IP address
Product type
MAC address
Connection to a router
via its RJ-45 Ethernet
port (on the Control
board).
When the C1 is in standby, it searches its attached
network (front LED blinking) for other CH products.
All detected CH products are listed here, starting
with current C1.
Parameters are Read Only
CONFIGURE
This C1 is master
This C1 is slave
This C1 is offline
Connection to a router
via its RJ-45 Ethernet
port (on the Control
board).
When physically connected to a network, the C1 can
ignore this network (offline) or connect to it as
being the master (it will transmit IR received
commands to all slave) or as a slave (it will ignore
remote control commands and receive commands
from the master device).
There must be no more and no less than one master
in a CH network.
This networking facility enables information sharing
among CH products (such as sound level for
multichannel D1+C1 configurations).
ANNOUNCE
Broadcast
Connection to a router
via its RJ-45 Ethernet
port (on the Control
board).
Forces the C1 to send a broadcast message on the
local network to announce itself. This forces other
devices to detect it, and send back acknowledge
messages with their own information.
Details of NETWORK menu Parameters
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4.4 Remote control
4.4.1 Remote control operation
The C1 controller is delivered with an IR remote to control the unit's basic operations. The provided remote control is not intended
to be used to configure the unit.
(1)
(2)
(3)
(4)
(5)
(6)
C1 D/A Controller remote control
(1)
(2)
(3)
(4)
(5)
(6)
Remote control activity LED
Mute/Standby (long push) button
Volume up button
Volume down button
Next input button / Phase polarity inversion (long push)
Previous input button / Phase polarity inversion (long push)
The remote control activity LED is illuminated while a button is pushed on the remote. The remote control's buttons support dual
functions by distinguishing Normal Push [NP] and Long Push [LP]. For a Normal Push [NP], the button is released immediately
after pressing. A Long Push [NP] requires the button to be pressed for at least 2s before being released.
Remote control functions are according to the following table:
Remote Control Button
Normal Push [NP]
MUTE
Mute/Unmute (also wakes-up from STANDBY) Sets unit into STANDBY or wakes it up
VOLUME UP
+0.5 dB
Increase volume by larger steps
VOLUME DOWN
-0.5 dB
Decrease volume by larger steps
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NEXT INPUT (6)
Select next enabled input
Phase inversion
PREVIOUS INPUT (5)
Select previous enabled input
Phase inversion
Remote control functions
4.4.2 Changing the remote control batteries
If the LED does not turn on when pressing a button of the remote, it is likely that the remote batteries need to be changed. To
replace the batteries, remove the back cover of the remote control by removing the screws (M2.5 cross-shaped type, make sure to
use appropriate screwdriver). Exchange the batteries for new ones (make sure to respect batteries polarity) and put the back cover
back in place and tighten the screws. 2 AAA batteries are required.
4.5 Advanced clocking
Many audio sources can be connected to the C1. Depending on their type, and your C1 options, different clocking scheme can be
used. Some are simply not working at all (no sound will come out of your C1, e.g. because at least one unit doesn't lock its internal
clock to the configured clock source), some others will work for some time before muting (e.g. in case more than one unit is
configured to lock to its own internal clock), some others will work fine but won't be optimal depending on your hardware (e.g.
using D1 as clock source and C1 as clock slave when equipped with SYNC_IO boards, or engaging the SRC with AES-compliant
sources), while others will bring you the joy associated to pure musical emotion.
Recommended use cases for various configurations are detailed in the following paragraphs. Even though this chapter is quite
technical, we kindly ask you to take the time to read it in order to get the best sound out of your CH system.
4.5.1 General clocking considerations
In any configuration, there must always be no more and no less than one clock master. In CH product range, the clock master is the
unit clocked on its own internal clock (parameter clock source is INTERNAL). It can be a CH product, or an external clock generator.
If more than one clock master is used, the system is no more synchronized (at some point a unit will display “CLOCKING ERR.”). If
there isn't any clock master, each unit gets synchronization from a unit that is clock slave itself. This kind of system is not stable,
and may either never output sound, or unlock after some time. If the configured clock source (e.g. SYNCHRO BNC 75 Ohm) is not
connected or has no synchronization signal, the C1 can not lock (open padlock symbol displayed) and mutes its output.
4.5.2 Without SYNC_IO board
When a C1 with no SYNC_IO board is used together with a CH D1 SACD/CD drive (or other standard S/PDIF audio sources), both
audio data and clocking goes from the source to the DAC. More precisely, clocking is embedded in the audio stream. Schematic
below shows optimal way to connect such system:
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D1 SACD/CD Drive, default setup (1x DIGITAL_OUT)
CH-LINK Cable
C1 D/A Controller, default setup (1x DIGITAL_IN)
Simple D1 - C1 connection
More generally, when a C1 has no SYNC_IO board, it can only clock itself to the incoming audio stream (clock source is AUDIO IN)
when playing a CH-LINK, AES EBU, COAXIAL or OPTICAL input. The same applies for multichannel setup when CH products have no
SYNC_IO board. In such case:
•
D1clock source: INTERNAL
•
C1 clock source (for this input): AUDIO IN
If in this configuration (clock source = AUDIO IN) the C1 is not able to lock (open padlock) on an incoming S/PDIF audio stream
but properly detects its sampling frequency (a valid Fs is displayed instead of “Fs UNKNOWN” in the upper left corner of its
display), it probably means that the S/PDIF source does not comply with AES standard and/or has too much jitter. To overcome this
problem, set the clock source as “SRC” for this input. It will add an asynchronous sample rate conversion stage that has a wider
locking range.
4.5.3 C1 D/A controller (with SYNC_IO board) + D1 SACD/CD drive (with SYNC_IO board)
When both the C1 and the D1 are equipped with a SYNC_IO board, optimum performance are obtained when the C1 DAC is the
clock master, and the D1 drive is the clock slave. Audio stream goes from the D1 to the C1, but clock goes the other way. Schematic
below shows to connect such system:
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D1 SACD/CD Drive, 1x DIGITAL_OUT + SYNC_IO
CH-LINK Cable
75 Ohm BNC coaxial cable
C1 D/A Controller, 1x DIGITAL_IN + SYNC_IO
D1 - C1 connection when SYNC_IO equipped
When paired with a hybrid configured D1 (DIGITAL_OUT L/R + ANALOG_OUT Ls/RS and C/Sub), recommended setup is still the
same (i.e. clock goes from C1 to D1 to have optimal conversion condition for main channels). In such case:
•
D1 clock source: SYNCHRO BNC 75 Ohm
•
C1 clock source (for this input): INTERNAL
4.5.4 3x C1 D/A controllers + multichannel D1 drive (all with SYNC_IO board)
In this 4-unit multichannel setup (D1 with all 6 channels digital out + 3 C1 DAC pairs), when all units are equipped with SYNC_IO
boards, we still recommend that the C1 processing the main channels is the clock master. The D1 is slaved to this C1's clock, and
generates a synchronization signal for the two other C1s (Ls/Rs and C/Sub ones). Schematic below shows optimal way to connect
such system:
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D1 SACD/CD Drive, 3x DIGITAL_OUT (L/R + Ls/Rs + C/Sub) + SYNC_IO
CH-LINK Cable
CH-LINK Cable
CH-LINK Cable
75 Ohm BNC coaxial cable
75 Ohm BNC coaxial cable
75 Ohm BNC coaxial cable
L/R C1 D/A Controller, 1x DIGITAL_IN + SYNC_IO
Ls/Rs C1 D/A Controller, 1x DIGITAL_IN + SYNC_IO
C/Sub C1 D/A Controller, 1x DIGITAL_IN + SYNC_IO
Multichannel D1 - C1 connection when SYNC_IO equipped
In such case:
48
•
D1 clock source: SYNCHRO BNC 75 Ohm
•
L/R channels C1 clock source (for this input): INTERNAL
•
Ls/Rs channels C1 clock source (for this input): SYNCHRO BNC 75 Ohm
C1 User Manual
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•
C/Sub channels C1 clock source (for this input): SYNCHRO BNC 75 Ohm
4.5.5 C1 D/A controller + Computer (USB audio)
When a C1 equipped with a USB_IN board is used together with a computer for audio files playback, a single link is in place
between them: a type A (computer side) to type B (C1 side) USB 2.0 cable. But this single link enabled data to flow from the
computer to the C1, while the C1 give the pace of the data transfer, thus being clock master. Schematic below shows how to connect
such system:
Computer with USB port (e.g. Laptop)
Clock Audio
USB A-B cable
C1 D/A Controller, 1x DIGITAL_IN + 1x USB_IN
USB Computer to C1 connection
In such case:
•
C1 clock source (for this input): INTERNAL
4.5.6 C1 D/A controller + Computer (Ethernet audio streaming)
When a C1 equipped with a NETWORK streaming board is used together with a computer for audio files playback, a single link is in
place between them: an RJ45 Ethernet cable. But this single link enabled data to flow from the computer to the C1, while the C1
give the pace of the data transfer, thus being clock master. Schematic below shows how to connect such system:
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Tablet
Wifi
Computer with LAN capability (e.g. NAS server)
Clock Audio
Ethernet RJ45 cable
Router
Audio
Clock
Ethernet RJ45 cable
C1 D/A Controller, 1x DIGITAL_IN + 1x Ethernet NETWORK board
C1 connection to home network
In such case:
•
C1 clock source (for this input): INTERNAL
4.6 Returning to Factory defaults
The unit can be reset to Factory default settings by using the RESET ALL SETTING item of the FACTORY SETTING menu. For a list of
Factory default settings, please refer to the Specifications section.
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5
Firmware update
5.1 Introduction
The C1 D/A Controller is built around multiple programmable circuits. This approach allow the unit to be updated to support new
features. It includes a host micro-controller, a display controller, several FPGAs (Field Programmable Gate Arrays) and DSPs (Digital
Signal Processors). When optional boards are added, even more programmable circuits are in use inside your C1. All of these
components run firmwares which can be updated when needed, for instance to support additional features or to correct a bug. The
following sections describe how to update the complete firmware of your C1 unit.
5.2 Firmware Update procedure
5.2.1 Preparing the firmware image
Before doing the actual firmware update, it is necessary to prepare the firmware update image. Firmware update images are
available in the form of compressed .zip files from our website at www.ch-precision.com.
The following procedure shows how to prepare the firmware image:
1. Start by downloading the latest C1 firmware image from www.ch-precision.com
2. Prepare a blank, FAT32 formatted USB stick. Please note that some USB sticks are not properly detected by the USB
interface of the C1. CH Precision have tested successfully and therefore recommends Sandisk USB flash drives.
3. Decompress the firmware image .zip file to the root of your USB stick
After doing so, your USB stick should contain the following files:
•
C1_xxx.ds1 & C1_xxx.ds2:
Firmware update file for main C1 DSPs and audio streaming DSP
•
C1_xxx.fp1 & C1_xxx.fp2:
Firmware update file for C1 FPGAs
•
C1_xxx.mc1:
Firmware update file for C1 Micro-controller
•
C1_xxx.ol1:
Firmware update file for C1 Display controller
where 'xxx' indicate the software version number.
Make sure all six files are present at the root of your USB stick. Any missing file will prevent correct operation of the firmware
update procedure.
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5.2.2 Updating the firmware (Firmware Update procedure)
Once the USB stick is ready with the appropriate files, the effective firmware update can be engaged. To do so, follow the steps of
the Software Update procedure:
1. Connect the USB stick to the A-shaped USB port of the CONTROL board at the rear of your C1 unit.
2. Turn the unit on if it is in standby or powered-off. Navigate to the C1_SETUP>>FACTORY_SETTING menu and select the
UPDATE_FIRMWARE item.
3. Start the Firmware Update process by applying a Normal Push [NP].
4. Once the Firmware Update is done, the unit automatically goes into Standby. Please note that the unit will perform a
quick Reset (display turning off and back on) during this procedure. Remove the USB stick and wake the unit from
Standby. The new firmware should now be active.
5. To verify that the Firmware Update was effective, navigate to the C1_SETUP>>FACTORY_SETTING menu and select the
FIRMWARE_VERSION item. Check that the displayed firmware version number matches the version number of the
firmware update image.
Note: The Firmware Update process can last several minutes (about 10 minutes), do NOT interrupt it!
When performing a Firmware Update, do NOT interact with the unit or the remote control, do NOT unplug the unit from the AC wall
outlet and do NOT turn the mains power switch off. Interruption of the Firmware Update procedure may result in corrupted
firmware and non functioning unit. In case something has gone wrong during a Firmware Update and the unit is not functioning
correctly anymore, apply the Emergency Firmware Update procedure described in the next section.
5.2.3 Emergency Firmware Update procedure
Apply the following Emergency Firmware Update procedure if your unit is not functioning correctly after a failed Firmware Update
procedure:
1. Turn the unit completely off by setting the Power on/off switch to off.
2. Prepare and insert the USB key with the appropriate firmware image for your unit (make sure all files are present).
3. Push the Control Knob and power-up the unit by setting the Power on/off switch to on. Keep the Control Knob pushed
until you hear the internal relay click (a couple of seconds).
4. The unit will start up in Emergency Firmware Update mode and will update its internal firmware with the firmware
images present on the USB stick. Do not interrupt or unplug the unit until the Emergency Firmware Update is finished.
This may take several minutes. Please note that the unit will perform a quick Reset (display turning off and back on)
during this procedure.
5. Once the Emergency Firmware Update is finished, the units goes into Standby mode. Remove the USB stick and wakeup the unit by a Normal Push [NP]. The unit should now start-up properly with the new Firmware.
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6. To verify that the Emergency Firmware Update was effective, navigate to the C1_SETUP>>FACTORY_SETTING menu
and select the FIRMWARE_VERSION item. Check that the displayed firmware version number matches the version
number of the firmware update used for the Emergency Firmware Update procedure.
Note: The Emergency Firmware Update process can last several minutes, do NOT interrupt it!
If the Emergency Software Update procedure fails, try to download the latest software images from www.ch-precision.com and
rerun the Emergency Software Update procedure (don't forget to prepare the software update files and USB stick accordingly). If
failure persists, contact your authorized dealer.
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6
Troubleshooting
Error
Action
No power
Check the AC power cord
Check the power button at the back of the unit
Check the mains fuse on the AC power cord receptacle
Remote control does not work
Check if the unit is connected to the AC wall outlet and powered-on
Check if distance is not too far to the C1 unit. Get closer and try again. C1's Standby LED
should briefly illuminate
Change batteries in remote control if required (Remote control LED does not illuminate)
Make sure the C1 is not configured as Slave on the network (Settings / Network / Config)
Make sure Factory Setting / Remote control matches your RC5 remote control (Pre2 by
default)
No sound
(general)
Check that your source is playing
Check that your amplifier is turned-on and speakers are connected
Check that the system volume setting is not too low
Check that the correct input is selected on your C1
No sound
(“7” is displayed)
Your C1 is muted (display area 2 7 must be off). Unmute using first RC button
No sound
(“Fs UNKNOWN” is displayed)
There is no incoming digital stream for the selected input, or it is at an unsupported sampling
frequency. Check supported audio format in the specification table (chapter 7.1). Try switching
to another input to verify that your C1 works well on other inputs.
No sound
(“INVALID SIGNAL IN” is
displayed)
Incoming audio stream is non-PCM (e.g. AC3 or DTS).
Only play PCM on standard digital input, and PCM or DSD on CH-Link and ethernet streaming
inputs.
No sound
(“K” is displayed)
C1 is not locked to its clock source (symbol 7 should be a closed padlock J).
Please refer to advanced clocking chapter 4.5 for details on valid clocking combinations.
If you are using a clocking scheme involving external clock in/out (SYNC_IO optional board),
make sure 75 Ohm BNC cable is properly connected and not damaged.
No sound
The source (e.g. D1 SACD/CD drive) and the C1 are not synchronized.
(“CLOCKING ERR.” is displayed) Please refer to Advanced clocking chapter 4.5 to make sure a valid clocking scheme is used. If
you are using a clocking scheme involving external clock in/out (SYNC_IO optional board),
make sure 75 Ohm BNC cable is properly connected and not damaged.
“ADC OVERFLOW ” is displayed
for a short time
The voltage exceeded 6V RMS at the input of the C1.
If it is only trigged by the landing of the needle of the cartridge on the record (which produces
a short signal overshoot), it is perfectly normal.
If this message appears in other conditions, it means that the global voltage level of the
analog source is too high and should be decreased
“ADC OVERFLOW ” is displayed
for a long time while playing
If the phono stage has no subsonic filter, the rumble noise boosted by the RIAAA correction
curve can lead to extremely high amplitude voltage swing at the input of the ADC, saturating
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records.
it. In this case, use a subsonic filter of decrease the gain of the phono stage.
Lost in the settings?
Restore factory setting and start your setup again
Firmware update fails
Try Emergency Software Update procedure
If it fails, download the latest C1 firmware from www.ch-precision.com, prepare a software
update image on a FAT32 formatted USB stick and run the Emergency Software Update
procedure again
USB flash drive for firmware
update is not detected by C1
Please try another brand of USB flash drive (e.g. Sandisk).
Troubleshooting
If the error cannot be corrected using the information from the above table, disconnect the unit from AC wall power and from the
rest of you system and contact your authorized dealer.
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7
Specifications
7.1 Specifications
General
Supported audio formats
Standard digital inputs (AES-EBU, coaxial and optical):
- Stereo S/PDIF encoded PCM; 16 to 24 bits; 44.1, 48, 88.2, 96, 176.4
or192 kHz
CH-Link:
- Stereo I2S PCM; 16 to 32 bits; 44.1, 48, 88.2, 96, 176.4, 192, 352.8
(DXD), 384 (DXD), 705.6 or 768 kHz
- Stereo cyphered DSD 1bit; 2.8224 or 5.6448 MHz
USB (audio class 1.0):
- Stereo PCM; 16 to 24 bits; 44.1, 48, 88.2, 96 kHz
USB (audio class 2.0):
- Stereo PCM; 16 to 24 bits; 44.1, 48, 88.2, 96, 176.4 or 192 kHz
- Stereo DSD 1bit; 2.8224 MHz (DoP)
NETWORK (Ethernet):
- Stereo PCM; 16 to 24 bits; 44.1, 48, 88.2, 96, 176.4, 192 kHz
352.8 (DXD) and 384 (DXD) kHz will be supported in the future.
- Stereo DSD 1bit; 2.8224 or 5.6448 MHz (DFF and DSF files)
User control
Dual concentric rotary knob with push function (control knob)
Display
480 x 272 24bits RGB AMOLED
Power supply
Selectable 100V, 115V or 230V AC, 47Hz to 63Hz
Power consumption (Standby)
< 1W
Power consumption (Normal operation)
40W average
Operating conditions
Temperature: +5C to +35C, humidity: 5% to 85% (no condensation)
Dimensions (L x D x H)
440mm x 440mm x 120mm (main body)
Weight
25kg
Analog output stage
Balanced outputs
XLR connectors
Single-ended outputs
RCA connectors
BNC connectors
Output level
5.4Vrms (balanced)
2.7Vrms (unbalanced)
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Frequency response (-3dB point)
DC-120kHz (balanced and unbalanced, digital filter dependent)
Dynamic Range (DNR)
120dB (balanced and unbalanced)
Signal to Noise Ratio (SNR)
123dB (balanced and unbalanced)
Total Harmonic Distortion + Noise (THD+N)
<0.0015% (balanced and unbalanced)
Digital Audio inputs (DIGITAL_IN board, four stereo inputs per board)
CH LINK
Proprietary high-definition link supporting high-definition uncompressed
audio and control. Cyphered operation for high resolution signals (DSD).
LVDS signaling for all I2S audio signals (incl. clocks).
PCM 16-32 bits / 44.1-768 kHz; DSD 2.8224 or 5.6448 MHz
AES-EBU (consumer format)
XLR connector, 0.5-5Vpp diff., 110'Ohm
PCM 16-24 bits / 44.1-192 kHz
Coaxial (S/PDIF)
RCA connector, 0.1-1Vpp, 75'Ohm
PCM 16-24 bits / 44.1-192 kHz
Optical TOSLINK (S/PDIF)
Standard TOSLINK optical connector
PCM 16-24 bits / 44.1-192 kHz
USB Audio inputs (USB_IN board, one connector per board)
USB Audio Class 1.0 (A-type plug)
Asynchronous playback (C1 master, computer slave)
PCM 16-24 bits / 44.1-96 kHz
USB Audio Class 2.0 (A-type plug)
Asynchronous playback (C1 master, computer slave)
PCM 16-24 bits / 44.1,-192 kHz
Ethernet Streaming Audio inputs (NETWORK board)
Audio file types
WAV, AIFF, FLAC, ALAC, MP3, AAC
Audio formats
Stereo PCM 16-24 bits / 44.1-192 kHz
Stereo DSD 1bit / 2.8224 or 5.6448 MHz
Analog Audio inputs (ANALOG_IN board, two stereo inputs per board)
Balanced input pair
True balanced XLR connectors
Single-ended input pair
RCA connectors
Maximum input level
4Vrms (balanced)
2Vrms (single-ended)
A/D conversion stage
24 bits / 192 kHz
Synchronization inputs and output (SYNC_IO board)
Clock input
Rev 1.9
1x BNC connector, 0.5Vpp to 5Vpp, 75'Ohm or high input impedance
Wordclock (44.1, 48, 88.2, 96, 176.4, 192 kHz),
Masterclock (22.5792, 24.476 MHz),
DSD bitclock (2.8224 MHz),
Atomic clock (100 kHz, 10 MHz),
40% to 60% duty cycle square wave
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Clock output
2x BNC connectors, 2Vpp, 75'Ohm output impedance
Buffered Clock input or Audio Wordclock
50% duty cycle square wave
Remote control
Remote control type
Infrared. Uses RC5 codes. Range: 10m (line of sight)
Remote control batteries
2x AAA type
Specifications
Design and Specifications are subject to change without notice
Weight and dimensions are approximate
Illustrations are informative only and may differ from actual production models
Casing design by Mana Ishoni
7.2 Dimensions
C1 D/A Controller dimensions
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7.3 Factory settings
Following table lists the factory settings of your C1 D/A Controller:
SETTING
Value
AUDIO SETTING
MUTE
Unmuted
PHASE POLARITY
In phase
CLOCK SOURCE
CH-LINK: Audio In
AES-EBU: Audio In
COAXIAL: Audio In
OPTICAL: Audio In
USB: Internal
STREAMING: Internal
XLR (analog): Internal
RCA (analog): Internal
INPUT TYPE
All available inputs: normal
INPUT GAIN
0 dB on all inputs
BALANCE
Centered
MONO MODE
Stereo
PCM FILTER TYPE
Minimum phase
DSD FILTER TYPE
Minimum phase
C1 TYPE
D/A Controller (volume control enabled)
MAX START VOL
-50 dB
MAX VOLUME
0dB
USB AUDIO CLASS
2.0 (up to 192 kHz)
USB AUDIO POWER
Keep USB powered
PHONO CURVE
RIAA
DISPLAY SETTING
DISPLAY TYPE
Input
LED ON/OFF
Off
BRIGHTENESS PCM
80%
COLOR PCM
Blue
CUSTOM COLOR PCM
VFD like
BRIGHTENESS DSD
80%
COLOR DSD
Blue
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CUSTOM COLOR DSD
VFD like
BRIGHTENESS ANALOG
80%
COLOR ANALOG
Blue
CUSTOM COLOR ANALOG
VFD like
INPUT RENAMING
CH-LINK 1 / 2 / 3
AES EBU 1 / 2 / 3
COAXIAL 1 / 2 / 3
OPTICAL 1 / 2 / 3
USB 1 / 2
STREAMING
ANALOG XLR 1 / 2
ANALOG RCA 1 / 2
SHORTCUTS
SHORTCUT1
MUTE
SHORTCUT2
PHASE POLARITY
SHORTCUT3
None
SHORTCUT4
None
SHORTCUT5
None
SHORTCUT6
None
Factory settings
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CH Precision Sàrl
ZI Le Trési 6D
CH-1028 Preverenges
SWITZERLAND
www.ch-precision.com
[email protected]
Made in Switzerland
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