Question about Onkyo Amplifiers & Preamps

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L or R Channel cuttint out

I have two Onkyo M-1501 Amplifers that have the same problem. After they are running for a bit one of the channels either shuts off, or is on a really low volume level.

If I cycle the power, then I can hear it again, but after a bit, one of the channels shuts off.

Any help would be appreciated

Posted by on

  • gholt Jan 09, 2009

    Would the short be in the amp?



    I never have this problem when I hook it to other decks. I'm just wondering if a transistor has blown out because of age, etc that would cause this as well.



    In the past, I had 2 or three speakers hooked up to the amp. So, I think it was running at 2 ohms with 3 speakers rated at 8 ohms. (I did this before I knew it would cause problems.) If this helps anything.

  • gholt Jan 09, 2009

    Additionally, the only time this seems to happen is when a left and right channel are running, not just one channel, but both speakers were hooked up at the time.



    I will try it tonight and see what happens.

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You have a shorted speaker, crossed speaker wires Or a blown speaker. The amp is reacting to the short.

Start with one speaker by itself, unplug the rest. Check the polarity. Run it on the channel that cuts out. can you replicate it? Check the connections on the amp, and see if they are really close to touching.

Absolutely if it happens on both amps, unless you bought both B stock or Remanufacturerd and they have the same problem. This is rare

Hope that helps you!

Charles


Posted on Jan 09, 2009

  • charles durando Jan 09, 2009

    I would say it were the amp if it were not exactly happening on two different identical amps.
    there is the possibility that one of the sources is causeing the problem, you could also try changing the RCA cables to the sources.




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I see now how it could have happened to both amps. Yes, this triple speaker combo will cause this problem.

Next time if you want to run speakers like that, instead of parallelling them, series them.
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Here is a great primer, dont worry about the calculations and mumbo jumbo, the pictures should tell you what you need to know to get it done.

http://www.termpro.com/articles/spkrz.html


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