Question about NAD C320 2-Channel Amplifier

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Amplifier overheating and swtching of

Hi I have expericed my amp overheat and switch off on two occasions when connecting it to a mixer. It plays ok for a couple of hours but then overheats.

It is connected to the same set of speakers (Yamaha) I have at home and I haven't experienced over heating at any time then.
Apologies for not putting any more specifics on the type and size of speakers. If you require this information please let me know and I will get the details.


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  • zsbeat Apr 06, 2008


    Thank you for your reply, apologies for the delay i have been away.
    I also sent a separate email if you are wondering who that was.

    My NAD amp is C 320BEE and my speakers are
    Yamaha NS 55.



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You need to provide me the specs of your amp, your speakers. Impedance important. You are experiencing overload, overheating caused by overload. You have a wider frequency range using a mixer and that affects the output stage of your amp and can cause to fail.

I am from Yamaha service before and they have speakers that has 4-6Ohms impedance only. And you have to know your amp if capable of handling such low impedance. you may not have problem with the power but it should be impedance.

Posted on Mar 25, 2008

  • Redentor Rivera Apr 06, 2008

    Please try to find out the specifications of your NAD, im not familiar with the model. if you can look at the back panel to find the output power ratings like watt per channels (RMS) and the impedance of speakers (you will see that somewhewre in the speaker terminals). I weanted to know first if your matching is possible. because definitely you have an overload but maybe there is a way to solve that by switches at the back panel. See if you have a speaker impedance selector. NS55 is medium power speaker system. But it may be possible that oyu have overdriven the speakers one time and that the voice coils must have gone shorted a little and impedance became lower then. that will cause your amp to trip.

  • Redentor Rivera Apr 06, 2008


    have you tried using the amp without the EQ? please try it and see if it will still does the same turning off. I have checked the specs of your amp and speakers and your speakers has got a lot of power to handle. it is a mis match with your amp but it wont cause any problem though because your speakers gets more power handling capacity than the amp. anyway... just try bybassing the EQ and see if it will still trip. if it doesn't then you must be overdriving your amp not your speakers. because the power output of your NAD can handle up to 110W depending on your loads. if you power uo too much then it will cause your nad to trip. the impedance of your yamaha speakers is 6ohms rated at 250W... thats a lot of power to handle and 100 % more than what your amo can give. But the thing is are you sure at no time you have tried to poiwer up the amp too load that the sound of your speakers are already distorted? what type of music do you frequently play? bottom line is load are overloading. or maybe another solution is give your amp a better cooling system, a fan on top. prolonged use of your amp at high power will require more ventilation. if you are experiencing chutting of at high volumes only then maybe you can use a blower fan on the top grill. it may not look good in your furniture but it wil help. if you are setting up your audio system, i suggest that you dont put anything on top of your amp to give better ventilation. normall we tend to place the amp at the bottom, that is not good for we choke the vents for the amp and it will cause trouble. I hope your speakers did not get damaged. if you don't hear an abnormal sound performance ony oru speakers specially your woofers, then it could be your mid range or the tweeters. It could even be the crossover networks. but its very hard to tell now which is which. we isolate first one by one. ill guide you.

    1st bypass the EQ and see if it will work normal. if it does then put it back again. try to use a fan on top of the amp and use it at hig volmues for a while, giving it more ventilation. if it does not trip then it is only a case of overheating. if it doesn't trip often and occassional only, there should be nothing wrong with both amp and speakers. you just need to ventiallte it well. try it first then let me know..

    God bless



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