Behringer EUROPOWER EP4000 - PCB Schematic

PCB SchematicEUROPOWER EP4000
Page 3
left pin D30 on heat sink should be +55 no signal
left pin D31 on heat sink should be -55 no signal
to set bias, gain down, no signal, measure voltage across
R106 (Ch1) or R2 (Ch2) and adjust VR6 (Ch1) or VR3 (Ch2)
for minimum x-over distorion or 0.09v (90mv)