Question about NAD C370 2-Channel Amplifier

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Power but no sound

I just received this amp second hand and everything powers on and switches between speaker selections and input selections fine, but I am getting no sound out from either speaker selections nor the headphone jack. Can you give me somewhere to start?

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  • lukeroberts Apr 20, 2008

    I figured out the problem this afternoon. The connections from the pre-out to the main were loose enough to cause this problem. I feel a little dumb.

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The cables going from the pre-out to main were just loose enough to cause the problem

Posted on Apr 20, 2008

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I have a Sony TA-AX 301..powers up fine.. and can


Make sure your speakers are the correct impedance for the amp. They should be 8 Ohm.

Connect them to the Speakers A sockets on the back of the amp.

Set the Speaker selector switch on the amp's front to Speaker A

Connect your source as detailed in the other answers.

Set the graphic EQ to either Off or Flat or put all the sliders to the middle position.

Apart from setting the volume on the amp, that should be it. If there's still no sound then you should recheck your wiring and input selection (make sure the red & white are connected to an IN and not and OUT on the amp). KIf there's still no sound then either the speakers or the amp (or both) have a fault.

Sep 16, 2014 | Audio Players & Recorders

1 Answer

How to turn off mute from receiver


I can't find a mute button on your receiver, but there are a few things that can avoid getting sound to your speakers.
Before trying anything, please turn the volume knob down to a very low volume. It the amp is set to a high output and the speakers get everything with a bang, they could be damaged seriously.
The amp can manage to sets of speakers. A and B. The can be switched on separately, both or non. Make sure the group you connected the speakers to is engaged, or to test, switch on both.
Then there is the headphone plug. If a plug is in there, it will kill all sound going to the speakers. Also when the contacts in the socket are oxidised, this can cause no sound coming through.
So if you have a sound input, on port 1, a CD player, and you select CD. You should hear sound coming out of the speakers if you select A and B. Eventually you can press in a headphone in to listen if there is sound in the amp.
Oops I just found another thing. You can connect / disconnect pre and power amps on the back of the amplifier. Look on the part I add here from the manual and check if the bridge is in.



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Jun 25, 2014 | Yamaha RX-V990 Receiver

1 Answer

I have no sound out of the front speakers. Mute button is off, speakers work fine. Only have sound (very little) if volume is turned way up.


NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.

Turn the volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the amp's
full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume
it's probably not there.

Carefully examine the front panel for clues like a misplaced Source Selection, Mute, Tape
Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or 'dead'
spot through defect or idleness and is causing your symptom. Turn the POWER OFF and operate
every control throughout its range a number of times, especially rarely-used ones like Tape
Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

Jul 10, 2011 | Yamaha RX-V870 Receiver

1 Answer

All of a sudden our receiver stopped working. The display looks fine, but there is no sound.


Turn the volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Source Selection, Mute, Tape Monitor control or Multichannel Analog Input selected.

If you have an aha moment turn the volume to something reasonable and see if that helped.

Jun 26, 2011 | Harman Kardon AVR 320 Receiver

1 Answer

I HAVE A ONKYO TX-910 RECEIVER THAT I PURCHASED IN 1993. IT PRESENTLY HAS NO SOUND. SHOWS POWERED UP & REMOTE CONTROL WORKS. HAVE CHECKED ALL THE SPEAKER WIRE CONNECTIONS & THEY ARE FINE. CAN THIS...


NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.

Turn the volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or 'dead

Apr 09, 2011 | Onkyo TX-910 Receiver

1 Answer

Cannot Power Up, Sometimes can


i had a real nice yamaha natural sound receiver and the relay that switched it on went bad a lot..... try the relay???

Apr 26, 2010 | Yamaha RX-V650 Receiver

1 Answer

Yamaha RX-V2700 no sound from any speaker outputs


Make sure that you have the correct input signal selected.
Also, check if the sound is not muted.
If you have a multi-room speaker switch, make sure it is set correctly to main speakers.

Apr 28, 2009 | Yamaha RX-V2700 Receiver

1 Answer

No sound


1. check if the amp is in PROTECTION mode (might be a bad speaker or shorted output)
2. check the 'MUTE' switch
3. try to use the FM/AM mode to isolate an input source. If there is sound then check input source.
4. ...still no sound have a techinician check it.

Apr 15, 2008 | Denon AVR-2400 Receiver

1 Answer

Speaker hook ups


It seems you are implying that your receiver itself has got an amp though small. You use another amp to boost your power, is that right?

It will definitely damage both your receiver and amp, just waiting which one to go first if you do what you are saying. In the first place how do you connect your receiver to the second amp? it has a line out i suppose? and for now your speakers are only connected to the booster amp? So it is only a matter of selecting where your speakers get connected when you wanted. DO NOT, in any case splice your speaker wire to attach your receiver speaker to the output of your booster where your speakers are connected.

What you can do is just make a switch selecting which source you will use for your speakers. You just need a simple toggle switch 2poles/double throw. 1pole for each channel (R/L) connect your center pole to speaker, the other selectable 2poles to the output of booster, the other pole to the receiver. (each channel) that is your safest. If you a a techie you can actually make a power driven relay switch to select the speakers where to get connected but maybe you can not do that on your own. it has to be someone with knowhow, simple design though. the same principle, your meccanilca 2pole/double throw switch will be replaced by the same specs but relay. elecically driven whrn you turn on/off your booster.

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Mar 23, 2008 | Audio Players & Recorders

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