Chord Indigo Digital Preamplifier User manual

Indigo Digital Preamplifier
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CONTENTS
PRODUCT DESCRIPTION .................................................................................................................. 4
INVENTORY.......................................................................................................................................... 4
WHEN SETTING UP ............................................................................................................................ 5
SAFETY WARNINGS ........................................................................................................................... 6
AC POWER CONNECTION ................................................................................................................ 7
AC CONNECTOR ................................................................................................................................. 7
POWERING UP ...................................................................................................................................... 7
POWERING DOWN ................................................................................................................................ 7
CONNECTING YOUR EQUIPMENT ................................................................................................ 8
DIGITAL INPUT CONNECTIONS ..................................................................................................... 9
USB ...................................................................................................................................................... 9
DUAL COAX ...................................................................................................................................... 9
AES1 & AES2...................................................................................................................................... 9
OPT.1 & OPT.2 ................................................................................................................................... 9
ANALOGUE INPUT CONNECTIONS ............................................................................................. 10
OUTPUT CONNECTIONS ................................................................................................................. 10
OUTPUT CONNECTIONS ................................................................................................................. 11
WORD CLOCK OUTPUT ..................................................................................................................... 11
HEADPHONES .................................................................................................................................... 12
USB HUB .............................................................................................................................................. 12
IPOD DOCK ......................................................................................................................................... 12
WIRELESS RADIO CONNECTIONS .............................................................................................. 13
BLUETOOTH RECEIVER ..................................................................................................................... 13
CHORD DIGITAL RF LINK ................................................................................................................. 13
EVERYDAY USE OF YOUR INDIGO ............................................................................................. 14
TURNING ON YOUR INDIGO................................................................................................................ 14
SELECT THE INPUT SOURCE ............................................................................................................... 14
BLUETOOTH INPUT PAIRING PROCEDURE........................................................................................ 15
FREQUENCY INDICATION .................................................................................................................. 15
BUFFER SETTING ............................................................................................................................... 15
PHASE SETTING ................................................................................................................................. 15
ADJUSTING THE VOLUME .................................................................................................................. 15
SPECIAL FUNCTIONS ...................................................................................................................... 16
USING THE REMOTE CONTROL .................................................................................................. 17
SELECTING THE INPUT SOURCE ........................................................................................................... 18
ADJUSTING THE VOLUME .................................................................................................................... 18
MUTE .................................................................................................................................................. 18
TO UN-MUTE........................................................................................................................................ 18
CONTROLLING THE IPOD .................................................................................................................. 18
MAINTENANCE ................................................................................................................................. 19
ADJUSTING THE SETTINGS ................................................................................................................. 19
CLEANING .......................................................................................................................................... 19
CHANGING THE BATTERIES IN THE REMOTE CONTROL ................................................................... 19
SERVICING ......................................................................................................................................... 19
FREQUENTLY ASKED QUESTIONS ............................................................................................. 19
PRODUCT SPECIFICATION ............................................................................................................ 20
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Indigo Digital Preamplifier
Thank you for buying a Chord Electronics product.
Before you start to enjoy your preamplifier, please take a couple of minutes to read how to connect your audio
equipment and how to maximise your listening experience.
Product Description
The Indigo is the very latest in our digital product development specifically designed to be the universal control
centre for both digital and analogue sources. It takes our most advanced technology and combines it into one
convenient full sized product. The Indigo is fully featured including a revolutionary digital iPod dock with wireless
radio link option. Using the Chord modified iPod (option) a true digital output can be obtained to feed directly into
our DAC circuitry. We have chosen to modify the iPod to gain this direct digital feed so that unlike other USB
based products it does not interfere with the control and operation of the iPod. If uncompressed music files are
used this can at last turn the iPod into a true high end music source. Using the supplied adapter digital music can
also be streamed wirelessly via digital radio link from a modified iPod anywhere in a room allowing for more
useful and convenient control from your armchair. For unmodified iProducts we are providing a standard high
quality A2DP radio dongle and this links directly to the Indigo’s A2DP receiver.
The digital heart of the Indigo uses the latest generation of field programmable gate array devices (FPGA) as
found in the QBD76. The FPGA handles the switching of SPDIF inputs, all digital SPDIF decoding, digital PLL,
RAM buffer controller, WTA filtering, and the 5th generation Pulse Array DAC. The improvements to the Pulse
Array DAC have been further complimented with improved power supply design and layout giving the very best
digital to analogue conversion.
Digital inputs include SPDIF, AES, optical, USB, iPod and of course our latest developments with Bluetooth
audio. Using our custom designed Bluetooth receiver we have been able to extract the digital audio information
and input this directly into our DAC technology. Unlike the low quality audio seen from other Bluetooth devices
this gives us much better performance and enables CD like transfer of music from the Bluetooth device. Using
your A2DP equipped mobile phone or computer you can connect wirelessly to the Indigo.
As well as supporting digital connectivity the conveniently situated iPod dock features the standard analogue
connection and charging for use with any iPod. If you have the USB input connected to a personal computer then
you can also sync and transfer music to the connected iPod. There is an inbuilt USB hub with two additional front
panel connectors so that further devices can be connected to your computer via the Indigo.
An analogue input is provided for non digital sources via balanced XLR or RCA phono connectors and there are
both direct line level and volume controlled analogue outputs. Using the line level output AV Bypass is possible.
Headphone connectivity is available with a low distortion, low noise headphone output jack socket easily
accessible on the front panel.
Control is via the front panel or remote control and the large front panel display gives clear indication of settings
and digital frequencies.
Inventory
As well as your Indigo and this user manual, you should also have received the following items.
1. System Remote Control including user manual
2. Power cord
3. Chord guarantee registration card
4. USB Cable
5. Bluetooth adapter
7. 2x Antennas ( Aerials )
8. Ipod and digital ipod adapter ( Optional )
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When setting up
To ensure that your Indigo works efficiently and safely, please pay particular attention to the following issues.
Ventilation
Your Indigo should have at least 5cm of clear space all around it to ensure a free flow of air at all times. We do not
recommend that you place Indigo directly on a carpet.
AC lead and plug
All Chord equipment comes supplied with the correct power lead and plug. This should be used at all times.
If you need to fit a plug for UK/Europe
Connect the blue wire to the neutral terminal
Connect the brown wire to the live terminal
Connect the yellow/green wire to the earth terminal
If you need to fit a plug for US/Canada
Connect the white wire to the neutral terminal
Connect the black wire to the live terminal
Connect the green to the earth terminal
Earthing issues in Europe
In some European countries a hum may occur if your Indigo is connected to mains sockets that do not have an earth. If
this is the case please ensure that:
1. Your Chord unit is connected via a multi-way mains block, which contains an earth point
at each socket outlet. This is to ensure that the chassis metalwork of each item is
connected together.
2. We recommend that an earthing method for your building be implemented.
3. Use the connecting points on your Chord unit and connect to an available earth point.
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Safety Warnings
It is important that your Indigo is earthed at all times via its own mains lead. Failure to do this may be hazardous.
The power supply components within the Indigo are designed to operate at lethal voltages and energy levels.
Circuit designs that embody these components conform to applicable safety requirements. Precautions must be
taken to prevent accidental contact with power-line potentials. Do not connect grounded test equipment.
There are no user serviceable parts within the Indigo Reference Preamplifier. Unauthorised
tampering or dismantling of this product will invalidate the warranty and could cause injury.
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AC Power connection
The AC power connector of Indigo is at the back of the unit. Plug the female end (socket) of the power cord into
the power connector of the preamplifier, and the male end(plug) of the power cord into AC wall socket or AC
extension socket. The Indigo features a universal voltage high frequency power supply and will operate
automatically from 65V to 260V AC, 50 or 60Hz.
For optimum operation it is recommended that the Indigo is connected directly to the wall socket via the
power cord provided.
AC Connector
IEC 10A
EARTH
AC Connector
Powering up
Press the rear panel switch. The display and internal illumination will light up. The display will show the selected
input.
Powering down
Press the rear panel switch. The Indigo utilises soft start circuitry so the power can switched on and off as often as
required. There is no need to leave the Indigo permanently switched on but it can be if this is more convenient.
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Connecting your equipment
Chord amplifiers are supplied with and designed to be connected using balanced inputs. The interconnecting
cables you use will depend on the available input and output sockets on your other equipment. We have installed
unbalanced inputs on all Chord equipment, thus enabling you to mix Chord Electronics and other manufacturer’s
equipment.
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1
Balanced inputs carry twice the strength of signal of unbalanced inputs and are able to be fed down long lengths of
cable with less deterioration of signal. They are also less prone to interference than unbalanced inputs. Balanced
inputs have three pins and use Neutric XLR style connectors. Pin 1 is earth, pin 2 is positive and pin 3 is negative.
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Unbalanced inputs use RCA phono connectors, which are gold plated with teflon high performance dielectric
insulators for optimum performance.
speakers
outputs
power amplifier
- Amplfication
pre-amplifier
- Switching and
level control
inputs
Red Reference
CD Player
outputs
CD Player
inputs
outputs
outputs
inputs
inputs
QBD76
CD Transport
SYMPHONIC
phono stage
Turntable
Basic system diagram
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- Data and
analogue
conversion
- Signal
Source
Digital Input Connections
The Indigo features several types of digital input connection explained in more detail below.
IN
USB DUAL
COAX
AES1
AES2
OPT.1 OPT.2
USB
Using the cable provided connect this to an available USB port on your PC or MAC. Audio playback on the
computer will now be sent digitally via the USB connection to the Indigo. On some computers you may need to
change the audio settings and select USB DAC to activate this connection
Please also see the section on the USB hub for further functions.
DUAL COAX
The two coax BNC connectors can either be used independently or together for dual data operation. Connect your
CD transport or digital source to either of the two connectors for single data 44 to 96KHz operation. If you are
using the Blu or other CD transport that features dual data 176 or 192KHz operation please connect both
connectors so that the top connector connects to the top connector on the transport and the bottom to the bottom
connector.
AES1 & AES2
The two AES balanced digital connectors can either be used independently or together for dual data operation.
Connect your CD transport or digital source to either of the two connectors for single data 44 to 96KHz operation.
If you are using the Blu or other CD transport that features dual data 176 or 192KHz operation please connect both
connectors left to left and right to right.
OPT.1 & OPT.2
The Indigo features a newer high speed version of optical interface allowing for 192KHz via a single connection.
Connect your digital source via an optical cable to either of the two optical inputs. You can still use both
connectors for dual data operation if your source supports this.
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Analogue Input Connections
The Indigo features an analogue input for connection to a non digital source. You can connect using balanced
cables or RCA phono cables.
Connect your analogue source to the input shown.
ANALOGUE
INPUTS
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Output Connections
The Indigo features line level outputs for connection to another preamplifier or AV processor and preamplified
outputs that are controlled via the volume control to connect directly to a power amplifier. Both sets of outputs are
available as XLR balanced or RCA phono connections.
Note: For optimum performance it is recommended that the balanced outputs are used where possible.
OUT. V/R
OUT. D/R
OUT. V/L
OUT. D/L
W/CLOCK
OUT
The bottom set of connectors marked as OUT.D/L and OUT.D/R are the direct line level outputs that are for
connection to another preamplifier.
The top set of connectors marked as OUT.V/L and OUT. V/R are the volume controlled outputs for connection to
a power amplifier.
WARNING: Take care when making output connections not to connect the line level outputs directly to a
power amplifier as the volume level will be extremely high and could damage the loudspeakers.
Word Clock Output
There is a high resolution 44.1KHz word clock output that can be used to synchronise the Indigo to other digital
equipment such as the Blu CD transport. Connect a coax BNC digital cable between the word clock input and output.
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Front Panel
The front panel is the main control centre for the Indigo. It features the multifunction display, control buttons,
volume control, headphone output socket and two USB ports. It also has the iPod dock where you can connect to
play music, charge and synchronise any of the current generation of iPods or iPhones.
Headphones
The Indigo features a ¾ inch headphone socket on the front panel. Simply connect your headphones and then use
the volume control to adjust the level. You may also wish to mute the connected preamplifier or power amplifier
you are using with the Indigo.
USB Hub
On the front panel are two additional USB ports to use with a connected computer. To use these the rear USB port
must be connected to a computer. You can then plug any USB peripheral into the front panel connectors and use
the device as though it was connected to your computer. For instance you may wish to connect an external hard
drive to transfer files, or an MP3 player to charge or synchronise or an additional keyboard or mouse to control
your computer.
Ipod Dock
To use the iPod dock carefully align the connector in the dock to the same connector on the bottom of the iPod and
push it fully down. The iPod will automatically start charging. The dock supports both the analogue line level
outputs from the iPod and also the digital connection if you are using the Chord modified iPod. These outputs can
be selected using the front panel or remote control.
If you have the rear USB connection connected to your computer you can also synchronise your iPod with iTunes
to transfer music. Press and hold the IP button on the front panel to activate IPROG mode before inserting the
iPod. Press and hold the IP button again to switch off this function.
Caution: If you are synchronizing your iPod using the IPROG function you should always disconnect it via
iTunes before removing it from the dock or switching off IPROG mode. Data loss or damage can occur if
the synchronization process is interrupted. Only remove the iPod when the ‘Safe to disconnect’ message is
displayed.
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Wireless Radio Connections
The Indigo features both a Bluetooth A2DP receiver and also a custom digital RF link for the Chord modified
iPod. Both systems are independent of each other and can be used at the same time without interference. The
provided antennas should be attached to the rear before using either system.
Screw both antennas to the sockets on the rear of
Indigo as shown. Pointing one vertically and one
horizontally gives the best performance. (The
antennas are identical so can be fitted to either
socket)
Bluetooth Receiver
Advanced Audio Distribution Profile or A2DP for short allows Bluetooth devices to transfer high quality music
wirelessly. Any phone, PDA or computer that supports A2DP can connect to the Indigo and play music without
wires.
There is a simple pairing procedure and with a 30m range it can be used anywhere in the home.
We have provided a Bluetooth adapter for use with the iPod. This device simply plugs into the bottom of the iPod
and connects automatically to the Indigo to transfer your music.
Chord Digital RF Link
The Chord modified iPod comes with its own RF wireless adapter allowing the digital audio signal to be
transferred without docking the iPod. Connect the adapter to the bottom of the iPod and the connection will
automatically be made.
Please note that due to the complexity of the link the RF adapter is a class 1 device with a maximum range
of 10 meters.
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Everyday use of your Indigo
Turning on your Indigo
Press the power button on the rear of the Indigo. Press again to switch off.
Select the input source
Press the button marked IP to change the input source. You can cycle round each of the inputs until the one you
wish to use is displayed. The options are shown in the diagram below:
OPT
Optical digital input via rear panel TOSLink connectors
COAX
Coax digital input via rear BNC connectors
AES
AES
AES digital input via rear balanced XLR connectors
USB
USB digital input on rear panel. Connect this to stream
audio from a computer.
BLTH
Bluetooth A2DP input. Use this input to stream wireless
bluetooth audio. ( See Bluetooth Pairing Procedure
below)
IPDIG
For use with the Chord modified iPod. Works both
when the iPod is docked and also with the wireless
digital RF link.
IPANA
For use with standard iPods when docked. This
connects the analogue signal to the Indigo.
ANIP
Rear panel analogue inputs for non digital source.
Cycle of input selection options
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Bluetooth Input Pairing Procedure
Select the Bluetooth (BLTH) input and then referring to your mobile phone (or Bluetooth device) instructions,
search for new paired devices. The Indigo will be identified as Indigo then a number. Select your Indigo and enter
the passcode when prompted by your phone (the passcode is set to “0000”) Confirm that you wish to connect to
the Indigo device.
The Indigo should now be locked to your phone, and able to receive high quality digital audio.
If you lose connection, for instance if the Indigo is switched off or you change inputs, then you can reconnect by
looking at the list of paired devices on the phone and selecting connect.
The Indigo bluetooth receiver will automatically disconnect when not using the bluetooth or IPDIG inputs.
Please Note:- If you are using the bluetooth adapter for the iPod then this has been pre-programmed with the
pairing passcode and will automatically connect once connected to the iPod.
Frequency Indication
44K
When a valid signal is detected on the digital inputs then the incoming sample frequency will be displayed briefly
before reverting back to the chosen input.
Buffer Setting
Press the BUFF button on the front panel to select the digital buffering. This sets the buffering for all digital inputs
but will not affect the IPANA and ANIP analogue inputs. The digital buffering stores the digital input data and
resynchronises it with a highly accurate crystal generated clock removing jitter. The three options are off,
minimum and maximum. There is a delay with audio playback when the buffer is used.
0BUF
MAX
MIN
Phase Setting
Press the PHASE button on the front panel to change the digital output phase from positive to negative. This does
not affect the analogue inputs IPANA and ANIP.
POS
NEG
Adjusting the volume
Use the volume knob to adjust the volume manually. A clockwise turn of the knob will increase the volume and an anticlockwise turn of the knob will decrease the volume. The volume range runs from 0 to 98 and is displayed on the Indigo
display as you change the volume. The volume level is shown on the display as the word VOL and a two digit level as
shown in the example diagram below.
VOL42
Volume display
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Special Functions
The front panel buttons also have some special extended functions.
IPROG
IPROG – Press and hold the IP button to activate the iPod syncronising mode. When activated providing the rear
USB connector is joined to a computer when you dock an iPod it will start the iTunes synchronising process. Make
sure you disconnect the iPod in iTunes before removing it from the dock or switching off the IPPROG function.
Press and hold the IP button again to switch off.
IR ON
IROFF
IR ON/IROFF – Indigo uses the same infra red (IR) remote control signals as other Chord preamplifiers so if you
wish to use it in conjunction with a preamplifier then you can disable the IR receiver so only the buttons and
manual volume control will work avoiding any interference between the two products. Press and hold the BUFF
button on the front panel to turn off the IR receiver IROFF. Press and hold it again to turn the receiver back on IR
ON.
----RESET – Indigo features a master reset that will clear all the microprocessor settings. To use it press and hold the
PHASE button on the front panel. After the reset a row of dashes will be displayed. Press the input button to select
an input once the reset is complete.
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Using the remote control
The Indigo is supplied with the system remote control that is a universal controller for all Chord products,
televisions and DVD players. Full instructions can be found in the System Remote Manual supplied but for the
purposes of controlling the Indigo the main functions are listed on the next page.
Press the HIFI key
to begin controlling the Indigo.
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Selecting the input source
Press the Line- or Line+ keys on the centre control to cycle through the inputs.
Adjusting the volume
Press the Vol+ button on the centre control to increase the volume, press the Vol- button on the centre control to
decrease the volume.
Mute
Press the mute key to mute the Indigo.
To un-mute
Press the mute key again.
Controlling the iPod
The Stealth remote control supplied with the Indigo has also been factory programmed so that you can play and
pause tracks playing on the iPod and also skip forwards and backwards through tracks.
Press
to pause and press again to play the track.
Press
to skip back through tracks.
Press
to skip forwards through tracks.
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Maintenance
Adjusting the settings
Always remember to make any changes to settings with the volume set low or an instant burst of sound could
damage your loudspeaker.
Cleaning
To clean finger marks and other blemishes from your amplifier spray clear glass cleaner onto a soft lint free cloth
and then use the cloth to gently clean your amplifier.
Changing the batteries in the remote control
Simply push the button on the bottom of your remote control to release the battery cover. Replace with four new
AAA batteries as shown inside the battery compartment.
Servicing
There are no user serviceable parts in your Chord amplifier, and it should only be serviced by Chord Electronics
Limited or their expressly approved Service Agents.
Frequently asked questions
why aren’t any of the remote control buttons working?
Press the HIFI button to set up the remote control for Indigo functions.
The range of the Chord digital RF link or Bluetooth is poor.
Check that the antennas are screwed tightly into the rear of the unit. Rotate the antennas to a different position, one
pointing vertically and one pointing horizontally may give the best performance. Move Indigo so that there are no
large obstructions blocking the wireless signal.
why is there humming coming from the loudspeakers?
Check that you’ve earthed the unit. The interconnects need to be properly screened and placed away from mains
cables. Interference can be reduced by using balanced inputs and outputs instead of RCA phono types.
my iPod will not synchronise
Remove the iPod from the dock before activating IPROG mode then replace. Check rear USB connector is connect
to a computer running iTunes.
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Product Specification
HARMONIC DISTORTION
SIGNAL TO NOISE RATIO
< -103 dB (1kHz, 24-Bit @ 44.1KHz Sample Frequency)
< -110dB (100Hz, 24-Bit @ 44.1KHz Sample Frequency)
> 120dB
CHANNEL SEPARATION
> 125dB @ 1KHz
DYNAMIC RANGE
120dB
SWITCHABLE DIGITAL
INPUTS
2 x 75 SP/DIF BNC Coax
2 x AES Balanced XLR Input
2 x Plastic fibre optic ( TOSlink )
1 x USB ( B type )
1 x Bluetooth supporting A2DP Stereo Audio
1 x Digital iPod Dock input
1 x Wireless iPod digital input
SWITCHABLE ANALOGUE
INPUTS
1 x RCA/XLR stereo analogue input
1 x Analogue iPod Dock input
ANALOGUE OUTPUTS
HEADPHONE OUTPUT
Stereo RCA Phono and balanced XLR Line Level Direct
Outputs
Stereo RCA Phono and balanced XLR Volume Control
Outputs
1 x ¼” headphone jack socket
USB HUB ( rear USB input
must be connected to PC )
RAM BUFFER
2 x Front panel USB sockets
1 x iPod dock sync
3 Settings – off, minimum & maximum
PHASE SWITCH
2 Settings – Positive or Negative output phase
SAMPLE FREQUENCIES
LINE LEVEL OUTPUT
32KHz – 96KHz Single Cable,
176KHz & 192KHz Dual Cable ( Dual data mode )
6V rms. Balanced. 3V rms. unbalanced
OUTPUT IMPEDANCE
75 (short circuit protected)
DIMENSIONS IN MM
420mm x 355mm x 88mm (Width x Height x Depth)
POWER CONSUMPTION
OPERATING VOLTAGE
30W
WEIGHT
12 Kg
85 – 270V AC (50-60Hz) auto switching
iPod and iPhone are trademarks of the Apple Corporation Inc.
Bluetooth is a trademark of SIG.
R203WWJN000006
Chord Electronics limited
The Pumphouse
Farleigh Bridge
Farleigh Lane
East Farleigh
Kent ME16 9NB
Tel: +44 (0)1622 721444
Fax: +44 (0)1622 721555
Email: sales@chordelectronics.co.uk
http://www.chordelectronics.co.uk
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