Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
Has your technician done a swept sine test on both chanels to get a response curve? Has he checked for distortion? I think I'd check those two things first. You may have a problem that's easier to find with measurements than listening by ear. This kind of test should be done first end-to-end, then at each amplification stage in the circuit. You will eventually find a point where the signal changes from what is present at the inputs, and by narrowing down each stage one at a time, your technician should be able to find the cause.