Question about NAD C370 2-Channel Amplifier

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Nad s200 At low volumes, my right channel goes out on my nad s200 amplifier. When I turn up the volume, with my balance turned all the way to the right, it will then kick in after some static. I wondered if it was my preamp, but I'm convinced it is a problem with the s200 amplifier.

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  • xxbadboyxx Feb 07, 2008

    Thanks for your prompt reply. After thinking about what you said, I checked the connections from the right speaker to the amp, and after replacing the wire with a new insulated wire, it now works perfectly. There must of been a short somewhere in the speaker wire which caused the problem. Funny, this is my third NAD amplifier that I've bought in the past month, all with the same problem, and turns out it was just the speaker wire.

  • fuelledbynin Oct 31, 2008

    Help! After years of trouble-free operation, both the speakers on the left channel of my beloved NAD C370 cut out simultaneously a few seconds after switching on to play music. Does this sound like the relay problem mentioned in this thread? How do I find the relay? I have no idea what a relay looks like.....

  • Anonymous Mar 28, 2014

    I use the preamp section to drive a c270 nad. The preamp is getting very warm after a few hours even though volume is very low. Thanks



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It is most probably a dirty speaker protection relay. gently tap the relay(the one that engages shortly after turning the amp on) when the fault is occurring and see audio returns. This should ascertain the problem. Replace it if it is a sealed type, or if it has a "lid" you can get off, burnish the contacts with a white business card, and give it a spray with contact cleaner/lubricant. Good luck and a "fixYa" rating would be great for my profile :)

Posted on Feb 06, 2008

  • Graeme Ross
    Graeme Ross Feb 07, 2008

    That's great you got it fixed. It would not have been a short, but more so an intermittent open circuit in the speaker wiring. The giveaway for that is that the problem resolves when you turn the vol up. The speaker protection relay is in the speaker output path just as the wiring is. I have seen the relay cause these symptoms many times



The relays are the culprit(s). I've owned several of these NAD amps. a 2200PE power amp, a 7400 receiver, a 5150 integrated amp, and a 2600 monitor series power amp. They all, with the exception of the 5150 which doesn't seem to have relays, have had the speaker /ouput section protect relays go bad. My 7400 is due again too. I used to sell this brand in college, and we'd see many of them come back after about 5-10 years with this problem. Very common.

Posted on Aug 17, 2008


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