Question about Denon AVR-3801 Receiver

1 Answer

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

Posted by on

  • 1 more comment 
  • 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




    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.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 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,




1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have buyed a panasonic 5.1 home theater before five years due to electrical variation the player was damaged all the speakers are in good condition ineed a suitable player to run the home theater need...

If your Speakers are in good condition, you can try buying a suitable wattage AV receiver with a bluray player of your choice brand ( Yamaha, Onkyo, Harmnkardon, Denon, Sherwood...etc) You can utilise your favorite speakers again.

Oct 27, 2013 | Panasonic 5.1 DVD Home Cinema System 1000W...

1 Answer

Connecting ps3 to home cinema

For sound use the Digital Coax in, if the PS3 has digital out. Most HiFi home cinema systems have HDMI with all channels audio through HDMI. Check cinema settings to configure input for hdmi audio, also check PS3 audio output setting options to include all supported audio type by your receiver. It's not just a plug and play. Both systems need to gor through a user setup process to make sure they sync and play well with each other.

Jul 24, 2009 | Audio Players & Recorders

1 Answer

Simple question?? how do I connect my Panasonic subwoofer to my denon receiver?

I have a very similar problem with the same exact Panasonic sub. I went to Best Buy and Radio Shack looking for an adapter, and they basically told me that one does not exisit. Apparently, Panasonic designed the home theater system specifcally so that it could not work if any part of the entire system was ever seperated.

May 27, 2009 | Panasonic SC-HT930 System

1 Answer

115v home cinema in 220v area

If it dosn't have a switch on the back to run in 220 I thought it did ??
then you will have to use one of those huge transformers they have over there and run it at 120

May 09, 2008 | Denon AVR-4308CI Receiver

1 Answer

I took my Denon receiver to a local repair facility, because it wouldn't fully "boot", after shutting down, when I tried to run a computer rca plug (on both ends) from our computer to a in wall -...

Please post the exact symptoms. What do you mean by not "booting up"? Does it click on then click off? This would mean that the unit is in protect mode which is usually caused by a problem with the output amplifier section not the Micro. Do you have any experience with electronics repairs? If so, I can try to guide you through the repair.

Let me know.

May 09, 2008 | Audio Players & Recorders

Not finding what you are looking for?
Denon AVR-3801 Receiver Logo

376 people viewed this question

Ask a Question

Usually answered in minutes!

Top Denon Audio Players & Recorders Experts


Level 3 Expert

5444 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

The Knight
The Knight

Level 3 Expert

75386 Answers

Are you a Denon Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides