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

I have a Sherwood Nottingham R-925RDS receiver. No matter what input I select it does not connect to the amplifier section. Everything else appears to function ok. Unit switches on & off, correct...

Let's work with FM as that is ONboard and can't be connected wrong. Does THAT work?

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' spot through 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.

May 06, 2011 | Sherwood Audio Players & Recorders

1 Answer

I want to connect YST-Sw1500 sub woofer to the AX-596 amplifier .How can I do the connections .

on ur subwoofer u will see HPF output, connect this output to MAIN IN of ur power amp (first remove jumper between pre-out and main in from ur power amp) connect pre-out of ur power amp to input 2 L&R (Left is also for mono input). the HFP selector switch will cut off 80Hz or 100Hz to the main input depending on the position enabling u to have high frequency sound on your main speakers. connect the speakers to the main output terminal of ur power amp. do not connect speakers on the woofer ouput.
make sure u are using the right impedance speakers. do not switch speaker impedance selector while the unit is on. 

Apr 04, 2010 | Yamaha AX-596 Amplifier

1 Answer

No sound at all. Power is on and all lights light up, but so sound output regardless of speaker selected or input.

I do not have experience with this particular amp. Generic trouble shooting follows:

Might it be that you have headphones plugged in? (Unplug them, they turn off the speaker output) You are absolutely certain of the settings on your amp? (check them again) Are you certain you have an input? (AM, FM, CD, AUX, other) (Make sure the input is turned ON and the source is properly selected.

Is the output protected by a fuse or fuses? (look on the back panel for fuses or fuse holder)

Everything that is suppose to be plugged in IS plugged in ... all cables are intact? Did you check them for contunity? You can check contunity with a flashlight battery, the light of a flashlight and a paper clip.

Speaker selection switches are pressed as appropriate. Speakers are connected to the appropriate outputs and they are ON. Speakers are of proper rating - and resistance? 4 ohm - 8 ohm - 16 ohm??? Any controls on the speaker are set at a neutral setting?

I'm sorry your device is not functioning as you think it should. These things are designed to work and generally, they are pretty good at it. Sometimes, they just break (stop functioning) It may be that you will have to take it back from where you got it for repair or adjustment. But I am hoping you have the headphones plugged in.

Thanks for your interest in

Dec 26, 2009 | Yamaha DSP-A1000 5-Channel Amplifier

1 Answer

Have Rotel RB-1080 stereo power amplifier. Problem: no sound from left-hand speaker. All connections are OK. Get sound from left-hand speaker when I connect it to the right-hand speaker connections of...

Try to plug a set of headphones into your amp.

If only one is working this means that either you're not getting both signals into the unit (check the signal input connectors, resolder any bad contacts), the signal doesn't get to the preamp or from the preamp into the power amp or the signal does not come from the power amp (check solder connections on preamp and power amp components, also check internal connectors - unplug, clean, reconnect).

If both headphones work well instead, then you're getting both signals into the unit and the preamplifier and the final amplifier are OK, since many amps derive headphone signal from the power amplifier via some power resistors - check for any power resistors around the headphone plug or in the section that has wires going to the headphones plug to see if this is the case - if it is, this means that the signal does get amplified, but it is not getting from the power amp to the speaker - in this case, check the following:

--- speaker connector solder contacts on the circuit board could have some damage - resolder if necessary

--- A / B speakers selector switch (if there is one, it could be a physical switch or a soft touch button driven relay so check for both) - there might be a bad solder contact on the switch pins or the switch / relay contacts may be dirty - resolder and/or clean the contacts (if they can be easily accessed).

--- final amplifier section: bad solder contacts on any power transistors, voltage regulators, power resistors, diodes, coils or other components, including internal connectors (anyway, if both headphones work well, these are all unlikely because the power amp is sending both signals out OK, however, you may want to give it a check, just in case...)

--- delayed speaker turn on relay or other relays - check for dirty relay contacts, clean with some fine sandpaper (you need to remove the relay cover which can be a bit tricky / difficult to access, mostly it's a snap-on cover, could also be resin filled and therefore impossible to open).

It could as well be a bad power amp (do the headphones test), the above suggestions are just a quick look at some common audio amp problems and possible solutions.

Also, if your unit has got many hours of use, it would be fair to check the input signal connectors - the solder contacts do get damaged when you plug / unplug the RCAs many times.

Hope all of this is not getting too lenghty and confusing... just post me some feedback if you have questions.


3rq8 (Triarcuate)

Sep 10, 2009 | Audio Players & Recorders

1 Answer

No sound output, regardless of channel selected, for 30-60 seconds

Hi Dan

The first click is the power relay connecting up the main transformer, the second click you normally hear is the speaker protection relay. When a fault condition is present in the amp, the protection circuit prevents the speakers connecting to the amp by NOT operating the relay. As the unit "settles" and works after the delay you noticed, what ever issue the amp is balancing itself it. It sounds like a leaky capacitor in transistor in the output stages. This can often be located with quick bursts of freeze coolant spray. It may also be a dry joint in the soldering about the driver and output transistors, always pays to have a visual look at it whilst you are in there. I also check power regulator stages for dry joints. The fault will be on one channel if it is signal path related, and both channels if power supply related. If you are familiar with electronic repairs, get in and have a look yourself. If not, get a NAD service guy to take a look at it for you. Good luck. Feel free to ask me any questions you may have about it.


Aug 14, 2008 | NAD C370 2-Channel Amplifier

1 Answer

Nad 317 Amplifier No sound

Could be the speaker output relays. GOOD LUCK

Apr 01, 2008 | Audio Players & Recorders

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.

Mar 23, 2008 | Audio Players & Recorders

2 Answers

PA amp + speakers

remove every sound input one by one until you find the one who make the trouble.if this procedure failed sent it to sevice center to fix it.

Oct 17, 2007 | Audio Players & Recorders

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