Question about Sony MUTEKI HTDDW1600 Theater System

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I have a sony HTDDW7600 or 8500 there is absolutely no sound coming out of the unit, i checked the manual for the trouble shooting and the only thing i could think of was something about a protective device on the reciever. please help

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  • Master
  • 8,546 Answers

Is it alive but silent or just plain dead?

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Posted on Mar 19, 2011

  • 2 more comments 
  • shadowsquall Mar 19, 2011

    active but silent, it's annoying, it's one of the latest models though, 7.2 channel model, if there is a difference.

  • shadowsquall Mar 19, 2011

    and i think it is internal, would you have an idea of any operating temperatures? and i did try it "naked", it's not the speakers, tested them my self, i spent a good while triing to figure out how a short could occur, the video processing stil works though, just not the audio.

    on a side note, is there any telltale signs that a speaker has blown without plugging it in?

  • David Dunn
    David Dunn Mar 19, 2011

    I can't find the manual.

    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.

    How does it work for test tones or just plain old FM?

  • David Dunn
    David Dunn Mar 19, 2011

    You could tape the speaker leads across a small battery the speaker would click or sound like static if there is continuity from the wire through the voice coil. Or if you have an ohmmeter, just measure it for short or open = BAD. Something near the stated impedance is good.

    Your problem is NOT a dead speaker.

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