upsonm Posted November 14, 2007 Share Posted November 14, 2007 Hello all, I am a newbie to the forum but a long time reader/lurker. I just started using a Denon 3805 that I purchased off of Ebay. It is in excellent condition and has seen little use according to the seller. Problem is that when I turn it on, and there is no other sound in the room, I can hear the unit making a slight buzz/humm/hiss noise. Not sure how to describe it exactly, but it is there. I just want to make sure there isn't anything wrong with it? I had a Sony DE-845 prior to this which was totally silent at power up so I am not sure what the Denon should sound like. Thank you for your time. Resp, Mark Quote Link to comment Share on other sites More sharing options...
Zen Traveler Posted November 14, 2007 Share Posted November 14, 2007 Welcome to the forum upsonm. I have a Denon AVR 3805 and it makes a couple of clicks on start-up, but doesn't make any of the noises you describe. After a second or two and it's up and running it is silent. Quote Link to comment Share on other sites More sharing options...
upsonm Posted November 14, 2007 Author Share Posted November 14, 2007 TDK, Thank you very much for the response. Now that I think about it, you might also describe it as like faint constant ring noise, similair to what you might hear after lighting off a firecracker near your ear but quiter. Anything like that or total silence on yours? Resp, Mark Quote Link to comment Share on other sites More sharing options...
Zen Traveler Posted November 15, 2007 Share Posted November 15, 2007 Well, After I posted I went downstairs to confirm. If I put my ear on top of it I can hear a slight hum, but after I step 3 feet away from it I don't hear it anymore. It sounds like a slight transformer hum, but not loud. Quote Link to comment Share on other sites More sharing options...
Guest srobak Posted November 15, 2007 Share Posted November 15, 2007 You mean like the high-pitched ring a tube TV gives off, almost in dog whistle range? Is it coming from the speakers or from the amp chassis itself? Is your amp properly grounded? Quote Link to comment Share on other sites More sharing options...
lo123 Posted November 15, 2007 Share Posted November 15, 2007 I have a Denon 1804, couple years old. Within the last year I have noticed a slight hum when it is on. If I very slightly pull up under the front right corner the hum goes away, release it and the hum is back. Suspect something inside is not grounded as well as when it was new. Otherwise no issues. Quote Link to comment Share on other sites More sharing options...
upsonm Posted November 15, 2007 Author Share Posted November 15, 2007 Gents,I really appreciate the info. TDK.....thanks for checking again and I hope that I haven't made you aware of something that will bug you like the tiny squeak in a car. I know that the sound somewhat decreases when I switch to the pure direct mode. You mean like the high-pitched ring a tube TV gives off, almost in dog whistle range? SROBAK, Yes, the sound is as you described and only emanates from the unit itself and there are no sounds coming from the speakers. None of the speaker hiss I have read about here. The closer I put my ear to the top of the unit, the better i can hear it. It is not something that I couldn't live with, I just want to make sure I didn't get a lemon. As far as grounding the unit, well I might have to. For now i have only plugged it in, hooked up my RF3's and the DVD/CD player. The unit is more complex than my old Sony so I have some reading to do about grounding. Thanks for the responses again, Mark Quote Link to comment Share on other sites More sharing options...
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