buzz noise from loud speakers

vibeline · 6th January 2007, 10:22 PM

this is my first post I hope I am in the right place.

My front speakers are driven by a denon poa2800 amp the center and rears ar driven by my yamaha 5890 receiver. when I turn the tv on I get a quiet buzz out of my front speakers only. It does not increase or decrease with volume adjustment. When I turn the tv off the buzz stops I think it is from the cooling fan in the tv. I ran an extension cord from the basement to plug the tv into the buzz is still there when I turn the tv on.
(50' away different circuit)

The denon amp pics up the noise the yamaha 5890 does not?????

Is there some gadget I can plug the tv into to stop the buzz from back feeding into the wall outlet?

My rig
50" LCD sony grand wega
yamaha 5890 reciever (drives center and rears)
nad 521bee cd player
Denon poa 2800 (drives front speakers)
paradigm monitor11 fronts
paradigm cc370 center
paradigm adp370 rears
seismic 12 sub
monster 2100 power bar

Thanks for the help

ocool_15 · 7th January 2007, 04:47 AM

Since it doesn't increase with volume it isnt a being fed into the amp input.

Seems odd you pick that up through the amplifer power supply but the first thing I would try is a filter on the fan itself.

Basically make a low pass crossover on the leads going into the fan. It will likely be 12V and I wouldn't bother with anything expensive. A filter consisting of a inductor and cap in series corresponding to the frequency of the fan(converted from rpm) would likely also work. That would be placed in parrallel with the fan.

There may be other solutions but that seems easy enough.

Spasticteapot · 7th January 2007, 05:24 AM

Quote:

Originally posted by ocool_15
Since it doesn't increase with volume it isnt a being fed into the amp input.

Seems odd you pick that up through the amplifer power supply but the first thing I would try is a filter on the fan itself.

Basically make a low pass crossover on the leads going into the fan. It will likely be 12V and I wouldn't bother with anything expensive. A filter consisting of a inductor and cap in series corresponding to the frequency of the fan(converted from rpm) would likely also work. That would be placed in parrallel with the fan.

There may be other solutions but that seems easy enough.

I'd just get a surge protector. They often have inductors to isolate RF.

Dave Bullet · 7th January 2007, 06:03 AM

If the denon is earthed, the tv not and yamaha not - then it could be a ground loop problem. (However - ground loop hum often varies with volume).

A simple test is to run a grounding cable from your TV chassis to ground.

If you suspect the TV fan - can you temporarily disconnect your TV fan to see if it stops?

How close together are the components - could it be some sort of EM interference?

David.

dublin78 · 7th January 2007, 04:22 PM

Maybe the rear speakers are shielded, and the fronts are not?

dublin78 · 7th January 2007, 04:24 PM

Ooops.
Isn't shielding designed to stop interference being produced by the loudspeakers?

vibeline · 7th January 2007, 04:33 PM

Quote:

Originally posted by Dave Bullet
If the denon is earthed, the tv not and yamaha not - then it could be a ground loop problem. (However - ground loop hum often varies with volume).

A simple test is to run a grounding cable from your TV chassis to ground.

If you suspect the TV fan - can you temporarily disconnect your TV fan to see if it stops?

How close together are the components - could it be some sort of EM interference?

David.

I grounded ererything the buzz is still there.
I disconnected the fan in the tv the buzz is still there, so it must be something else in the tv

Netlist · 7th January 2007, 04:36 PM

As a simple test, disconnect the TV and give your system another source, e.g. a CD-player. See if the buzz is still there.

/Hugo

pinkmouse · 7th January 2007, 04:37 PM

And does the Denon buzz with no input at all?

vibeline · 7th January 2007, 07:19 PM

The only time I get the buzz is when the tv is on.
If I shut the tv off, the buzz goes away...........
It does not buzz from the cd player, dishnet reciever,direct tv receiver, dvd recorder or dvd player.

6th January 2007, 10:22 PM	#1
vibeline diyAudio Member Join Date: Jul 2006	buzz noise from loud speakers this is my first post I hope I am in the right place. My front speakers are driven by a denon poa2800 amp the center and rears ar driven by my yamaha 5890 receiver. when I turn the tv on I get a quiet buzz out of my front speakers only. It does not increase or decrease with volume adjustment. When I turn the tv off the buzz stops I think it is from the cooling fan in the tv. I ran an extension cord from the basement to plug the tv into the buzz is still there when I turn the tv on. (50' away different circuit) The denon amp pics up the noise the yamaha 5890 does not????? Is there some gadget I can plug the tv into to stop the buzz from back feeding into the wall outlet? My rig 50" LCD sony grand wega yamaha 5890 reciever (drives center and rears) nad 521bee cd player Denon poa 2800 (drives front speakers) paradigm monitor11 fronts paradigm cc370 center paradigm adp370 rears seismic 12 sub monster 2100 power bar Thanks for the help

7th January 2007, 04:37 PM	#9
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	And does the Denon buzz with no input at all? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

7th January 2007, 07:19 PM	#10
vibeline diyAudio Member Join Date: Jul 2006	tv makes it buzz The only time I get the buzz is when the tv is on. If I shut the tv off, the buzz goes away........... It does not buzz from the cd player, dishnet reciever,direct tv receiver, dvd recorder or dvd player.

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7th January 2007, 04:47 AM	#2
ocool_15 diyAudio Member Join Date: Nov 2004 Location: sk	Since it doesn't increase with volume it isnt a being fed into the amp input. Seems odd you pick that up through the amplifer power supply but the first thing I would try is a filter on the fan itself. Basically make a low pass crossover on the leads going into the fan. It will likely be 12V and I wouldn't bother with anything expensive. A filter consisting of a inductor and cap in series corresponding to the frequency of the fan(converted from rpm) would likely also work. That would be placed in parrallel with the fan. There may be other solutions but that seems easy enough.

7th January 2007, 06:03 AM	#4
Dave Bullet diyAudio Member Join Date: Jan 2002 Location: Wellington, New Zealand	If the denon is earthed, the tv not and yamaha not - then it could be a ground loop problem. (However - ground loop hum often varies with volume). A simple test is to run a grounding cable from your TV chassis to ground. If you suspect the TV fan - can you temporarily disconnect your TV fan to see if it stops? How close together are the components - could it be some sort of EM interference? David.

7th January 2007, 04:22 PM	#5
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	Maybe the rear speakers are shielded, and the fronts are not?

7th January 2007, 04:24 PM	#6
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	Ooops. Isn't shielding designed to stop interference being produced by the loudspeakers?

7th January 2007, 04:36 PM	#8
Netlist diyAudio Moderator Join Date: Jan 2003	As a simple test, disconnect the TV and give your system another source, e.g. a CD-player. See if the buzz is still there. /Hugo

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