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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)?
Follow Ups:
Have you tried disconnecting the cable ( that goes into your device which probably is hooked up to the AV) from the wall unit ? After much messing around i had all my av stuff on one Monster power unit and my hifi stuff on another. Together with the ground breaker, i got rid of all the hums that i experienced
I had the exact same problem you describe in this and the following posts. I bought the Denon AV3801 and also noticed that in Direct mode i had no hum. I posted my problem in Tweaks ( i think). I had to buy the ground breaker from HomeTech. This sits between the (cable) wall plug and my vcr. Immediately i noticed the hum had dissappeared.
With shipping it came to $10. A bargain.
Nick,My Denon AVR4800 does this as well, although I've only noticed it when the input switch is set to "TV" and the feed is off. I believe that unless the sound is significantly audible, i.e. noticeable from where you sit, this is just a resistor circuit design topology used by many manufacturers that cuts out as soon as a signal is detected. Tha alternative design attenuates the ground circuit but you pay for that with a lower quality sound. Bottom line is, if you only hear it when your ears are close to the speakers then it is not a concern.
Steve
You didn't mention if you had the volume up or down when you heard the noise. Some processors have lots of digital noise when there is nothing going through the digital circuits. That would explain why you don't hear anything in "direct" mode, which bypasses the digital circuitry. Try hooking your speakers up to the receivers' amps and see if the noise is still there. I hate to say this, but this is not unheard of with SS processors. Denon has pretty good customer support, so I would call them and see if they've had similar questions.Mike
The noise is constant irrespective of volume setting. My speakers have been set up directly to the receiver's outputs with identical (read noisy) results!I'll ring up the kind folks at Denon to see what they recommend. While you really have to have your ear to the tweeter to hear it, the noise is very audible and should not be present if quality digital results are desired.
I don't know if anyone with a "pure" A/V pre-amp will stumble upon this post but I would value your feedback on how much "digital" noise your setup provides...
Thanks,
Nick
At higher volume levels I can hear noise when there is no signal being input to the processor. I believe this is because there are no muting circuits, as there are in almost every CD player. A cost/complexity issue? Who knows. If you have to put your ear against the speaker to hear it, I think you've got an acceptable noise level.Mike
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