Mytek Digital Stereo 96 DAC (VER.8/sep 2010) - Manual (Page 8)

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.
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