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Peculiar noise phenomena with Denon AVR-5700

24.4.252.228

Posted by NickS on January 21, 2001 at 13:35:02

Ever since acquiring the Denon AVR-5700 I have been satisfied with its impressive performance for both HT and music. Over time I became sensitive of noise that eminates from the speakers in any of the multi-channel modes when nothing was playing. After carefully checking cables and adding power conditioning, ferrites and shorting caps to inputs, a distinct buzz could still be heard particularly through the center speaker. Almost seems like something untoward is occurring within the Denon receiver.

I'm using the Denon receiver as a pre-amp with signal being sent to three Adcom GFA-555 amplifiers. With the Denon in the off position there is an extremely faint (nearly inaudible) hum through the speakers from the Adcoms indicating that they are on and that EMI/RFI is reasonably under control.

Now comes the interesting part: the noise through the left front and right front speakers decreases significantly in stereo mode and all but disappears in direct mode. While perfectly delighted with the system's stereo performance, I remain puzzled with what could possibly be causing the noise in multi channel modes.

Anyone with a similar experience (or better yet, fix)?

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