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Channel Imbalance at low volumes

Hi guys!

I got a sweet sounding NAD 7175PE the other day! It sounds rad at high volumes, however, at low volumes a significant channel imbalance appears. The left channel becomes MUCH dimmer than the right. The problem exists while using either the A or B terminals, but it also flips sides if I swap the left and right speakers, so it's not the speakers or speaker wires. Interestingly, the "A+B" speaker selection produces no sound for some reason. Not sure if that gives any clue as to the cause. Anyone know what's wrong? Thanks!
leemaze
leemaze OP
154 posts
 
But it sounds so good at high volumes!

What should I expect to pay for a tune-up?

Thanks!
teo_audio
932 posts
 
Impossible to say. Unless it is a full proper rebuild, which might cost $200+, then it's all going to be crutches of a sort (good crutches, bad crutches)....and the lifespan of the amp will be what the clock says when it finally fails.

This is the nature of audio electronics.  Like life, it's a series of blind and open trade-offs.
erik_squires
5,268 posts
 
The most obvious things to clean/replace are the volume and balance pots, but don't forget any speaker switches or relays.

Over time they get corroded and can act like little diodes. I had this happen with a Yammaha P2050. Replaced with new and much better relays, and added sockets for next time, problem solved.
stringreen's avatar
stringreen
5,112 posts
 
I agree with the Deoxit suggestion....also spray some in the volume/balance control (in the case)
leemaze OP
154 posts
 
There is no crackling whatsoever.  You still think cleaning is worth a try?
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