Question about NAD C370 2-Channel Amplifier

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NAD C370 Amplifier

When I switch the amp on it makes a loud buzzing sound that comes from within the amp itself and also comes though the speakers. It gradually fades away over a couple of minutes. What could be causing this? I have checked all my connections and everything seems fine.

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  • Anonymous Nov 22, 2008

    Hi I have had the same problem with my nad c370 a few times over the last eight years which was repaired under waranty the first two times, also on a second c370 I bought to bridge and use as a backup because Ive found the c370 so unreliable, It is the caps in the protection circuit. I was quoted £175 to have repaired through audio t. though I got it done for £60 in a local tv repair shop.

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  • 31 Answers

This sounds like a problem with the protection circuit, and/or the speaker relays. More specifically, a capacitor within those circuits that is not behaving properly. I strongly suggest having it looked at ASAP. 

Posted on Sep 17, 2008

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Hi arda5
Did you try swapping speaker connections left for right on the back of the amp to isolate the problem. If the fault stays with the speaker, then that is where your problem is. Try this and get back to me here with the results.

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