MyTek | Stereo 192 ADC | User manual | MyTek Stereo 192 ADC User manual

MASTERING DIGITAL TO ANALOG CONVERTER
USER MANUAL
VER.8/sep 2010
Use ver.5 manual for earlier units (without toslink)
This manual may be updated
Download the newest version at:
Http://www.mytekdigital.com
For technical support, technical tips and support check:
Http://www.mytekdigital.com/
or contact Mytek tech support at:
Highend@mytekdigital.com
or at:
tel. (646)-613 1822
fax.(212)-202 5331
Mytek
211 Centre Street
New York NY 10013
USA
1
Quick Start……………………………………………….3
Introduction..…………………………………….............4
Operation- Internal jumper and trimpots................……...5
Operation- Typical setup -Balanced Output…............…...6
Operation- Analog output alignment……………..………7
Operation- Unbalanced Output...........…….......................8
Rack mount shelf.......................................….....................10
Companion Stereo96 ADC…………………………….....11
Specifications…………………………………………......12
Warranty conditions……………………………………... .13
2
Quick Start
Output volume knob sets the output
volume with range from mute to max.
This is factory default. The knob can
be disabled with internal jumpers.
Additionally internal precision 10 turn
trimpots can be used to set the overall
gain of the output. Refer to "Internal
jumper settings" for details.
Input selection. Selects
which digital input source
to use for conversion to
analog.
Line power is 115VAC/50/60Hz
(factory default) or
230VAC/50/60Hz switchable by
internal switch accessible after
removing the top cover. 1 Amp
slow blow 20mm fuse is also
accessible under the cover.
110/220VAC
SPDIF
IN1
SPDIF
IN2
Hi-Fidelity, high drive
headphone out can drive
any type of headphones
with ultimate fidelity. It is
able to provide up to 1 Amp
of instant current drive. The
headphone out is the same
as XLR and it's always
routed through the knob.
Peak meter in dBFS. The red LED
marked "0"
corresponds to 1
sample overload.
When converter is synced to input its behaviour is
similar to real world situtation with some but not
full immunity to jitter. Superlock Mode uses stable
internal clock and provides the best clock stability
(10ps) and thus the best conversion. In
Superlock(tm) mode any signal is upsampled to
full 24 bit, 192k resolution and subsequently
converted to analog. The two modes are provided
for comparison reasons ie. real world vs. ideal
sound with no jitter.
Optical Toslink input can accept
both SPDIF and AES formats.
SPDIF format allows to interface
with Mac computers, including
Powermac laptops (up to 96kHz).
AES IN
OUT L
OUT R
TOSLINK
IN
SWITCH AND FUSE INSIDE
AES/EBU, SPDIF1, SPDIF2 and OPTICAL inputs
are seamlessly switchable on the front panel. This
switch can be used as input selector for 4 sources.
They operate in "single wire" mode for all sampling
frequencies. Inputs accept signal up to 96k.
WWW.MYTEKDIGITAL.COM
Analog outputs are +4dB balanced. They can also
be used to drive unbalanced inputs (pin1 GND, pin
2 signal, pin 3 NC). If the signal is too hot for
consumer unbalanced input, turn down the gain
using internal precision gain trimpots.
3
Introduction to Stereo96 Series Converters
The MYTEK Stereo96 series consists of two 1/3 rack units- the
Stereo96 ADC and the Stereo 96 DAC. They are also a part of an
extended family of 1/3 rack units which also includes Stereo192
converters, SRC and Studio Clock. Stereo96 converters can be used as
stand-alone devices for variety of studio applications such as
mastering, recording and playback, whenever the highest quality
conversion is required.
Users choose Mytek converters primarily for their outstanding sound
quality. The sound of Mytek converters can be described as
"transparent". We design our converters to be as faithful to the signal as
possible, rather than follow philosophy of some other manufacturers
who offer "analog" or "tube" sounding converters. Mytek converters
are closest to a straight wire, which is especially evident when used at
full 24/96 resolution. Sonically they are equal or better than the most
expensive mastering converters. Even when used in 16 bit mode, the
Stereo96 converters produce 20dB (10 times) less distortion than
typical converters found in budget recording equipment. On Mytek
website you can find and download various sound samples to evaluate
Stereo96 series sound quality and compare it to the sound of other high
end converter units. To download samples log onto:
http://www.mytekdigital.com/compare/listening_tests.htm
Stereo96 DAC features include:
-2-channel, 24bit, 96-kHz D-to-A conversion. 192k upsampling
in SuperLock(tm) mode.
-All sample rates playback with 100-kHz analog bandwidth in
SuperLock(tm) mode
-THD+N = -107 dB (0.0005%)
-120 dB Dynamic Range A-weighted
-AES/EBU and S/PDIF hi speed digital inputs (25-200kHz)
-Digital input source-selection switch
-Balanced, +4dB outputs (+29 dBu) with adjustable gain
trimpots
-Unbalanced operation with consumer levels
-Variable or preset output level controls, switch selectable with
high-performance conductive plastic attenuator
-Direct connection to powered monitors, the built in attenuator
can be used as volume control
-Built-in 0.5A high current drive, hi-speed headphone amplifier
-Total jitter immunity via Superlock™ technology
4
Overall L/R signal gain- turn it down for unbalanced consumer -10dBV
sources- use sinewave alignment procedure described further if necessary.
Default is typical +4dB output level.
Internal input gain trimpots:
JP1, JP3 - bypass output capacitors. This will extend the low frequency
response to 0Hz. It is important that the signal has 0 or very little DC
component. DC can be harmful to your speaker system. If unsure about any DC
coming from the source, then leave the capacitors in the signal path (default.)
JP2, JP4 - insert front stereo potentiometer as the output XLR volume controldefault- used typically when power amp or powered speakers are connected to
output. Turn it down for unbalanced consumer -10dBV sources.
Internal analog output jumpers:
Default
Capacitor
Bypassed
Default
Pot Removed
Stereo96DAC internal trimpots and jumper assignments
(remove top cover to access)
5
T1 Amp 20mm
Slow Blow fuse
115VAC/230VAC
power switch
Typical Setup
Balanced Output
Stereo96 DAC is equipped with 2 XLR analog outputs. For best signal to
noise performance it is recommended that the signal destination has a
typical kOhm impedance (1-20kOhm) input with standard +4dB line
level balanced signal. Alternatively a more sensitive unbalanced signal
destination can be used as described in subsequent paragraph.
In typical setup the DAC is running on its internal clock in Superlock
(tm) mode. In this mode Mytek DAC serves as a very stable low jitter
clock source which enables TOTAL jitter immunity which means that
any jitter at the DAC digital in is completely removed. In this mode all
digital input formats sound exactly the same with no jitter distortion due
to jittery source, jittery CD or long input cables. Because of careful
design this clock is as good or better than dedicated studio clock
generators. Additionally in Superlock(tm) mode signal of any format
(any FS, 16, 20 or 24 bit) is upsampled to 192k/24 bit resulting in overall
more realistic and accurate sound. When synced to “digital input” the
DAC works as a typical CD Player DAC where jitter is attenuated but its
effects can be heard. This second mode is provided for comparison
purposes- it allows mastering engineer to assess how the program will
sound when played by consumers on their typical DACs.
Setup for typical balanced operation includes following steps:
1. Setup internal jumpers to desired mode of knob operation. Setup all
other connections. Set sync to Superlock(tm). Alternatively for testing
purposed set sync to input.
2. Select desired signal source. Solid selector led at given input means
proper input lock. If input led is flashing there is either no signal or a
problem with locking to it. The DAC will automatically sync to any
frequency btwn 32-96k (external input sync) or 32-192k (Superlock(tm))
3. Play the program- you should be seeing level on the meters as well as
hearing the signal at output XLRs and headphones. Turn up the volume
knob if necessary. If levels at your power amp are inadequate for the
volume knob position- change the out alignment using trimpots.
6
Analog Output Alignment
1. Turn the output pot all the way up or disable it.
2. Play a digital audio source (DAW generator, test CD etc.) set to
approx. 1kHz at the peak operating level you have chosen (let's say you
have chosen -18dB).
2. Send the signal from the analog output to the console VU meter. If you
don't have a VU meter you can use an AC voltmeter set to measure AC
RMS values. "0 VU"at + 4dB corresponds to 1.225 Volts RMS measured
between pin hot (2) and pin cold (3) at the output XLRs.
3. Using a tweaker or a small screwdriver adjust the analog output
trimpots until the VU meter reads “0 VU".The alignment has to be
performed with accuracy of 0.1dB to be considered accurate.
Similar alignment procedure with 0.1dB accuracy is required for valid
A/B listening comparisons between different pieces of equipment. A
slightly louder source is typically perceived as "better" sounding.
7
Output driving unbalanced destination
Stereo96 DAC is equipped with 2 XLR analog outputs. For best signal to
noise performance it is recommended the signal destination has a typical
kOhm impedance (1-20kOhm) input with standard +4dB line level
balanced signal. It might be desirable to use a superior sounding
amplifier equipped with unbalanced ins to an inferior one which has
balanced inputs. The DAC can drive unbalanced inputs as easily as
balanced ones. Pin 2 of output XLR should be feeding “signal” of the
RCA, pin “1” should be connected to “shield” and pin “3” should be
disconnected. If a ready made XLR to RCA adapter is used, make sure
pin 3 is disconnected inside (typically it’s shorted to gnd). Additionally,
since typical unbalanced input is more sensitive at -10dBV, it might be
necessary to lower the output gain using internal trimpots (see
“alignment”).
Typically the DAC runs on its internal clock in Superclock (tm) mode. In
this mode Mytek DAC serves as a very stable low jitter clock source
which enables TOTAL jitter immunity which means that any jitter at the
DAC digital in is completely removed. In this mode all digital input
formats sound exactly the same with no jitter distortion due to jittery
source, jittery CD or long input cables. Because of careful design this
clock is as good or better than dedicated studio clock generators.
Additionally in Superlock(tm) mode signal of any format (any FS, 16, 20
or 24 bit) is upsampled to 192k/24 bit resulting in overall more realistic
and accurate sound. When synced to “digital input” the DAC works as a
typical CD Player DAC where jitter is attenuated but its effects can be
heard. This second mode is provided for comparison purposes- it allows
mastering engineer to assess how the program will sound when played by
consumers on their typical DACs.
Setup for typical unbalanced operation includes following steps:
1. Setup internal jumpers to desired mode of knob operation. Setup all
other connections. Set sync to Superlock(tm). Alternatively for testing
purpose set sync to external input.
2. Select desired signal source. Solid selector led at given input means
proper input lock. If input led is flashing there is either no signal or a
problem with locking to it. The DAC will automatically sync to any
frequency between 32-96k (external sync) or 32-192k (Superlock(tm))
8
3. Play the program- you should be seeing level on the meters as well as
hearing the signal at output XLRs and headphones. Turn up the volume
knob if necessary. If levels at your power amp are inadequate for the
volume knob position- change the out alignment using trimpots.
9
Rack Mount Shelf
The Stereo96 DAC is 1/3 rack space wide and 1U tall.
Mytek provides a 1U rack mount shelf as an accessory to mount up to 3 of
the 1/3 rack units. The units are attached to the shelf with a small screw
connecting the shelf to the bottom through a threaded hole on the bottom of
the unit.
When mounting the unit to the rack, you must follow these procedures to
ensure that you do not cause any damage to your unit:
1. Remove the rubber feet. If the feet are left on then you run the risk
of bending the chassis and/or the circuit board.
2. Use the supplied 1/4” 440 threaded screw only. Any longer and you
can cause permanent damage to the circuit board!
If you want to leave the rubber feet on then you have to be extra careful to
not overtighten the screw past the point of bending the chassis. 1/4” will
possibly work with the feet on but 3/8” 440 thread is recommended, although
there is a higher risk of circuit board damage with a longer screw.
10
Companion Stereo96 ADC
Stereo96 ADC is a two channel hi-end Analog to Digital converter for
recording and mastering applications. The main feature of this converter is
its outstanding sound quality which makes it suitable for the most
demanding projects when preserving the original signal quality is required.
11
Specifications
Conversion:
2-channel, 24bit, PCM 192-kHz D-to-A
conversion in SuperLock(tm) mode ( 96-kHz Dto-A conversion in input sync mode when digital
input sync is used)
All sample rates playback with 100-kHz analog
bandwidth in SuperLock(tm) mode
Resolution:
24 bit (16-24 bit input accepted)
Dynamic Range: 120dB A-weighted, 117dB Total
THD+Noise:
-107dB (<0.0005%)
Internal clock jitter:<10picoseconds
Analog Outputs:
+4dBm balanced or unbalanced , 75 Ohm,
trimpots and potentiometer for level control.
For variable or preset output level controls,
switch selectable with high performance
conductive plastic attenuator (for direct conn. to
power amp or speaker)
Digital Inputs:
Hi-speed (25-200kHz) AES/EBU, SPDIF,
Optical TOSLINK SPDIF/AES.
Digital 4 input source-selection switch
Jitter .
<10psec Total jitter immunity via Superlock™
technology
Headphone Amp Hi End, High Current Class AB Amplifier
Mains:
100/115V-220/240V 50/60Hz switchable
Dimensions:
1/3 rack space wide x 1U high x 8” deep
(5.5”x 1.6”x 8”)
Weight:
4 pounds
12
Warranty
This Stereo96DAC digital audio converter is warranted by Mytek to the
original purchaser against defects in workmanship and materials used in
manufacture for a period of one year from the date of purchase. Faults due
to customer misuse, unauthorized modifications or accidents are not
covered by this warranty.
No other warranty is expressed or implied.
Any faulty unit should be sent, shipping prepaid, to the manufacturer
service center. Prior to shipping the client should obtain an RMA# from
Mytek for warranty services. Units sent without RMA# will not be
accepted.
Mytek extends affordable repair service for all units manufactured to date
that are not covered by this Warranty.
13
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