Noise Test - Gallien-Krueger 8000RB Service Manual

8) Engage Hi-boost switch, compare to Fig. 12. (Disengage).
9) Engage Bi-amp switch. Compare 100W output to Fig. 13.
10) Compare 300W output to Fig. 14.
11) Set Freq. Knob 10, compare 100W output to Fig. 15.
12) Compare 300W output to Fig. 16. Disengage Bi-amp switch.

Noise Test

1) Remove oscillator input.
2) Turn front panel knobs to 10, switches out.
3) Connect speaker to 100W output and listen for noise. It should be smooth and not crackling. Repeat for 300W
output.
4) Change AC voltmeter range to 1V
5) Noise( both amplifier outputs) should measure less than 400mV.
6) Engage low-cut, contour, and hi-boost. Noise<400mVrms.
7) Volume to 0. Noise< 110mVrms.
8) Boost to 0. Noise<15mVrms.
9) Engage bi-amp switch. 100W noise< 20mVrms, 300W noise< 5mVrms.
RETURN KNOBS TO ZERO, SWITCHES OUT- READY FOR BURN-IN.