Question about Denon AVR688

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I have a Denon AVR-688 and recently I haven't been able to use any of the surround modes at all. The only mode that works, regardless of the component, is Direct mode. Any suggestions?

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  • mike880 May 18, 2009

    Yes, no sounds are produced when using any surround mode. It only produces sound when using "Direct" mode, regardless of the source selected. I was told to respond to your Clarification request here, but the form wants me to select whether this is a Solution or I have the Same problem, I'm selecting solution since this is a clarafication regarding a possible solution

  • mike880 May 19, 2009

    Yes I've already reset the unti and the problem persists. It looks like a bad dsp board.

  • David Dunn
    David Dunn May 11, 2010

    What do you mean by "works"? No sound? When a digital source is selected do the panel indicators indicate its presence and qualities, such as "5.1", "DTS", "Dolby Digital"??



    Have you checked the Tape Monitor? It would effectively cancel all Digital Sound Processing.

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Try to reset the unit: hold "speaker A" and "Speaker B" buttons and power on the unit. Display will be flashing, release the buttons after 3 seconds. If the problem still there, most likely you have bad digital signal processing (DSP) board - send the unit to repair facility.

Posted on May 19, 2009

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