Question about Sansui RZ-5300AV Receiver

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I HAVE A PIONEER RECEIVER SX-1280. WHEN I HOOK UP A SET OF SPEAKERS TO EACH SET OF SPEAKER TERMINERALS A B C ,IF I TURN TWO SETS OF SPEAKERS I HAVE AUDIO. IF I TURN ON ALL THREE SETS I LOSE AUDIO

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  • Bob Jul 10, 2010

    This is a vintage 1978 Pioneer receiver Model SX-1280. It has 3 separate speaker outputs labeled A, B, & C. If I connect speakers to each output, then select any 1 output I receive audio, if I select any combo of 2 outputs I receive audio, BUT if I select all 3 outputs I loose audio. Any suggestions?

  • Bob Jul 13, 2010

    Did't fix the problem, but need to accept so the next problem can be reviewed.

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  • Master
  • 1,851 Answers

As you can see at the back side near the speakers connectors, the total combination of the speakers resistance must be not bellow 4ohms per channel. Since the speakers are connected in parallel and usually are 8ohm resistance, with 2 speakers you have in total 1/8 + 1/8 = 2/8 = 1/4 that is equal with 4ohms. In the case with 3 speakers you get 1/8 + 1/8 + 1/8 = 3/8 that is 2.666ohms. This total resistance is out of specifications for your amplifier (and most of the amps). The good thing is that your amp is just stoping to play; in many other cases I can tell you that the amp will get trouble.
If you'd like to clarify for me the set up for your speakers and the area you'd like to have audio, I'll try to find a possible solution suitable for your needs.

In case of a problem or clarification, don't hesitate to post me a reply.
If you are satisfied, accept my solution.

Thanks and regards
Stelios
direct FixYa link: http://www.fixya.com/users/technical114

Posted on Jul 10, 2010

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  • Master
  • 6,826 Answers

The Pioneer receiver has 3 speaker terminal sets, apparently. One for right, one for left, and one for center channels.

Sounds like a good idea. But, when you switch it to turn all three sets you lose audio completely.

Sounds to me like the amplifier for that mode (3 speakers) is underpowered for your speakers.

However, if you put low wattage speakers onto each terminal a, b, or c and it still doesn't work, then the circuitry inside might be burnt out.

There is no reason that I can see based on your description that it shouldn't play out of all three speakers if you have the recommended speakers for that receiver hooked up to it.

Good luck on fixing this.

Posted on Jul 10, 2010

  • Duane Wong
    Duane Wong Jul 13, 2010

    I wish you the best in solving the problem on this vintage receiver.

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