Question about NAD T751 Receiver

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Right surround channel not working in some modes

I have had this receiver for years and had no issues, but it recently developed a strange problem. In test mode, the right surround channel produces no sound. Nor does it produce sound on inputs video 1, 2 and 3. However, when running on Ext 5.1 from a DVD player, all channels work perfectly. Since it works fine on Ext 5.1 the issue is not with the speaker cabling. And since it is broken in 'test' mode, it is not a problem with the source leads. Something must be going wrong within the receiver. Is there some way to reset the software or some other trick that might put it right?

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Re: Right surround channel not working in some modes

I had the same problem with the right channel.    It turned out to be a broken wire inside the receiver; it can be found connecting from the main PCB to the card for the 5.1 board.    After repairing the broken wire, it has worked fine.   


The harness connects the 5.1 low level signals to the board which are then redistributed to the amplifier section.     It is a bundle of wires in gray casing and with red, black and white wires (with shielding).


Find the offending wire, repair or replace and it should be fixed.


Hope this helps

Posted on Oct 27, 2007

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Make sure of what audio mode you've set your receiver to, as well as what the source audio signal contains.

Some modes, such as Dolby Digital/Pro Logic will adopt the input format, and subsequently use only the front left and right speakers if there are no LFE/Center/Surround channels present. Setting the mode to Pro Logic II or IIx, on the other hand, will force a signal to be spread out to the various extra channels.

Using the Automatic Field Detect mode will usually provide the most appropriate solution for the input signal, otherwise.

Also note that if your audio source is from a PC and you are playing games, some games will, when you are using the digital output of many sound cards (most notably the Sound Blaster Live! and Audigy 1-2 and Audigy SE model cards) output only stereo as their signal, but still in a digital format. Your receiver will pick this up as a stereo specific signal and avoid using the subwoofer, center and surround channels.

Unfortunately, for those cards, there is no work-around beyond using analogue output or getting a more recent, better compatability sound card, as it is a limitation between the drivers, the card and the game in question, rather than your receiver that has the issue.

If the above doesn't help alleviate your issue and/or you could clarify on what your source audio is and whether you encounter this issue with all source-types or not, please post a follow up response.

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How you power off the amp won't hurt it generally. I used to fix ONKYO amps under warranty, and I can tell you now, it will be full of dry solder joints. Take you unit to your local repairer, and they will resolder all the offending PCB's inside. This type of repair will fix 99% of strange audio noises and cutting in and out etc. for ONKYO recievers. Otherwise this is quite a good product.

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Maybe the surround processor is having a bad day... My kenwood would do similar and a reset was necessary to correct. Have you tried resetting the system? On my Sony STR DE 597 this is accomplished by powering off. Then while holding the 2 channel button down (front face plate) power on. A reset message is displayed. Your model may be similar but check your manual or download the PDF of the manual from Sony's support website. Hope this helps

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What do you have in the "multi channel input" jacks on the rear of the receiver? Those inputs Right, Left, Center, Surround R+L, and Sub are used when selecting 6 channel mode. They bypass the receivers surround processor board.

John W

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Can I assume the calibration procedure also didn't work for the Front left channel? (It's not a "surround" if it's in the front). Switch the receiver to Stereo mode to eliminate any DSP actions. Tune an FM station to eliminate any external device or cable issues. What do you hear from the two Front speakers?

OK? Select a DSP surround mode. Check all modes. What happens?

If the channel goes dead using some or all DSP modes there's probably something wrong with the processor. If they all work...

Isolate the source that exhibits the problem.

It was a bad left channel cable somewhere, wasn't it?

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1 Answer

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If you are referring to the rear speakers, it is normal. The rear speakers are not supposed to get a signal as loud as the fronts or center.

A surround sound system was originally developed for playing movies and the rear channels are for effects. In most surround modes the center channel will always be the loudest with the widest range of audio signals.

I have been repairing these type of systems since they have been on the market, so I know a lot about them.

This Kenwood you have is like most surround systems and does not have a feature that you would obviously like to have, 5 channel stereo. Only a few surround systems have this feature and they cost much more than the Kenwood systems. Denon and Marantz both make one with that feature. In 5 channel stereo you get a full signal to all the speakers. All the other surround modes you get a much lower signal to the rear speakers.

So in closing, you do not need it fixed, there is nothing wrong with it. You have a common complaint that many people have who buy a surround sound system but are not fully understanding of just what a surround systems is supposed to be capable of
. This is something that the salesman who sold it to you should have explained to you, that way you could have purchased a system that would have better suited your needs.

I would be happy to give you more help if you would like, just let me know. As I already stated, I have many years of experience with surround sounds systems, in fact I own the exact Kenwood model that you have and I like it very much. It is about the best you can get for that price.


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Receivers like this will incorrectly decode rear channel audio and pass it on to the rear channels as distorted audio. Make sure the source being used really has rear channel information encoded into it. It could have other issues but check this first.

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