Question about Denon Audio Players & Recorders

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Just bought used Denon 700 adv, can't get the sound right. voices are not crips and hard to understand. Tried all different surround modes and adjusted each speaker for Treble and Bass. Changed to two really good big stereo speakers and still have fuzzy voices. Don't know if this a adjustment problem or bad amp.??

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  • nick_colb625 Apr 07, 2011

    My input source is Vizio Digital TV optical output. I forgot to say that when I use the headset the voices are crystal clear, but when I go through the speakers it gets fuzzy. some TV channels are worse than others but none are "right". I paid $125.00 for this setup with 4 speakers and 1 subwoofer. Is it worth my trouble to attempt to have it fixed or should I just take my loss and forget it.



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You didn't mention what the source of your material is that you are inputting to the Denon and that may make a difference. If you have AM/FM selected, the problem could be in the receiver. If the source doesn't matter and you have distortion from any source, then the problem is in either the output amplifiers (which may be larger modules) or in the power supply. Not being able to hear it, it's tough to exactly diagnose but your description sounds like 'clipping distortion' and this can happen because of too low of voltage from the power supply. This can again, come from a failed voltage regulator IC or from capacitors that have decayed and are not filtering as they should. Any good tech should be able to pinpoint it better after hearing the distorted output.
While researching that model, I saw dates ranging back to 2003 and if it has been used a lot, this is long enough to have failed capacitors since they mostly come from China and there were millions of them made with poor electrolyte quality causing relatively early failure. I have US made electrolytic capacitors that are well over 30 years old that test close to their new values. Those from China have a lousy track record.

Posted on Apr 06, 2011

  • Steve Allison
    Steve Allison Apr 07, 2011

    > when I use the headset the voices are crystal clear

    The signal for the phones output doesn't pass through the final amplifiers but is 'picked off' between a preamp and the final amp. It is very possible that these stages are not using the same supply voltage since their demands are very different; most of the circuitry consumes little current compared to the finals and is often not even the same voltage at all. If both (or all) channels are producing distortion at the speakers, I believe the power supply section servicing the output stages is at fault. I don't know what labor costs in your area but the components most likely to be at fault are not expensive.



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