Mytek Digital Stereo 96 DAC (VER.5/jan 2006) - Manual (Page 5)

Typical Setup
-Balanced Output
Stereo96 ADC 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. 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 external.
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 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.
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 btwn. different pieces of equipment. A slightly
louder source is typically perceived as "better" sounding.
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