Question about Denon AVR-3801 Receiver

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I have recently acquired a old Denon AVR3801 Home cinema Receiver. I have plugged it all up and switched it on, but although the system seems to work quite nicely, the amp itself makes a buzzing/humming noise that can be heard distinctly at quieter times. The noise seems to emanate from the front left hand corner near the input selector - The amp is positioned on top of the hi-fi unit with nothing on top of it. The noise eventually goes away after a while (i.e half way through a film (i.e. multiples of tens of minutes) - but is always there on switch on. I have been told that you should swith these things on an leave them on standby. Any comments

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  • sh54 Mar 06, 2009

    Obviously the are a lot of wires coming out of the back of it and there is a plasma next to it on one side and a phono deck on the other.



    I have the following connected:

    NAD DVD/CD - Optical 1/ CD AUDIO IN

    XBOX - Optical 2

    TAPE DECK

    VIDEO

    CABLE



    I have speakers set up in a 5/6.1 format i.e. I have not got the speakers required for the 7.1 setup.



    I will probably be giving the XBOX a good kicking on it tonight with the kids, I will see how long it is before the noise subsides and then leave it on standby tonight.



    Is there possibly a prefered way of connecting up - optical? etc

  • sh54 Mar 06, 2009

    The instructions state that thee has to be a fair amount of clearance around the amp (10cm above) for cooling purposes, which is why its at on top of the unit (it actually won't fit in the slot vacated by its predecessor). So the noise is pretty noticable.



    Got to build a new unit now....Doh!

  • sh54 Mar 12, 2009

    I put a film (NAD DVD) on last night - Beowulf - with the amp doing the business. The amp was not maxed out as it was late and the kids were in bed - sub not on, etc.



    However the buzzing could be heard distinctly, at quieter times, throughout the film - so it did not, as first reported, disappear as time progressed. It would seem that it might have been my wishful thinking, or I had just got used to it.



    Leaving it on standby has no effect on the situation and I am getting frowns from the missus (not good!). The noise only starts when the amp is switched on and is in use.



    I am generally using audio connectors for most inputs, with only optical for the DVD and the XBOX.

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  • 463 Answers

The solution of leaving the thing on all the time would certainly work, but most of the time a buzzing sound inside a relatively robust audio amplifier is being caused by the huge transformer coil in the thing. Or wires that are in close proximity thereto.

In some ways, you're blessed that the buzzing is coming from the unit itself, and not through the loudspeakers.

Posted on Mar 06, 2009

  • Rob
    Rob Mar 06, 2009

    My favorite way of hooking up audio is through the "coaxial" digital connection. My ears do not hear any benifit of the optical fiber connection, and even a previum RCA patch cable is cheaper than the optical patch cable. Problem I find is never enough coaxial connections on the back of my receiver. Then again, I haven't purchased any decent audio equipment since '98,



    Take care,

    Rob

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