Question about NAD T760

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No signal from sub connected to NAD T760 in test mode.

Energy Encore 8 Subwoofer connected to NAD T760 sub woofer input using single RCA to RCA interconnect cable. When the NAD is turned on I get a woomf from the subwoofer so the sub seems to be receiving signal but it does not operate in test mode nor in normal pro logic or ears. Cant think of what has changed in my set-up to create recent problem.
Using preset 1 with all speakers large and sub-woofer on. Tried preset 2 to no avail.

Any ideas.

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  • ahmorgan May 24, 2009

    Thanks I tried your suggestion of using the front pre-out from the receiver. No signal. The sub does not have an on/off switch. It does have a blue light which comes on intermittently I think while its waiting for a low signal from the amp. The funny thing is when I touch the end of the interconnect cable which goes into the amp I get feedback in the sub. Also when it touches the outside of the amplifer around the pre out sub woofer connection on the amp I get strong feedback in the sub.

    What if I use the tape out?

  • ahmorgan May 27, 2009

    I did plug the sub in through the tape out and got a fairly strong signal through the sub so the problem points to the bank of audio pre-out connections on the T760. (Confirmed earlier by trying the sub in the pre-out front connections) Next step I believe would be to take the amp in for repair.

    Potential problem might be the solder connections on the board as these do not take kindly to heat.

    Thanks for your help.

  • ahmorgan May 27, 2009

    Did try plugging in the Encore 8 subwoofer through the tape 1 and got a strong signal from the sub so the problem points to the pre-out on the T760. Normally the sub is plugged in through the pre-out sub. This might have been confirmed when I tried the sub through the pre-out front which also provided no signal.

    Next step is to take in for repair. suspect the problem may lie with the solder connections on the board as the T760 is prone to overheating. Thanks for your help on this.



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Try using front pre out to the sub from the receiver. the crossover is in the sub anyway. If this works change your settings on the receiver and test again. If sub is still inop, could be an internal issue with the sub amp. Does your sub amp have an on/auto/off switch or light? check that as well. Hope this helps, if you need further assistance, send a reply and I'll help some more

Posted on May 24, 2009

  • Frank Fulton
    Frank Fulton May 25, 2009

    Interesting that your main out is not functioning... You can use Tape to test just make sure "monitor" is on. The feedback at least lets you know your amp and sub are ok. You can use any product that has an output to test to make sure the sub is triggering correctly. Check your Pre-out settings on the receiver as well if possible, generally the front pre out is always on. I'm wishing I could be in front of it now as it's always easier that way! Interesting note: when you have headphones plugged in, sub-out is off. It also does not work in "test" mode. If it's connected to a TV; Get into the receiver OSD setup menu put a cd on w/some bass and check your setting, your adjustment is from -10 to +10. That's a big spread and may be the issue. If you don't have the manual, Hope this helps some more.



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