Gainlab Audio GLA-TC2 Calibration Manual - Page 10
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Now go back to 3.3 and check if in Bypass mode you still measure 0V in between TP4 and TP5.
Most likely it will stay as you set up earlier. Repeat 3.3 and 3.4 if needed.
4.
STEP - LEVELLING
Starting point:
Input signal: +0dBu 1kHz sinewave, on both channels
Mode-HiComp, Meter- Output meter, Threshold
Switch positions:
minimum (full left), UNLINK
Measurement process: Adjust: VR1
Target: to measure +0.05dBu on the left output of the unit (not the
VU meter!)
Adjust: VR2
Target: to measure +0.05dBu on the right output of the unit
(not the VU meter!)
Error margin: 0.1dBu