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#149474 - 10/15/06 06:26 PM Sub emits low hum/buz
jonn21 Offline
frequent flier

Registered: 08/01/05
Posts: 16
Hello,
I have the epic midi 125 system with the ep125 sub. I have had this system for many months now and just noticed a low hum from my sub. What can I do to fix this buz sound...

thanks,
jon

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#149475 - 10/15/06 06:31 PM Re: Sub emits low hum/buz [Re: jonn21]
jonn21 Offline
frequent flier

Registered: 08/01/05
Posts: 16
I got rid of the buz. I had to unplug my tv audio from my receiver. I guess I can't have stereo when watching tv...that sucks.

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#149476 - 10/15/06 06:50 PM Re: Sub emits low hum/buz [Re: jonn21]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13567
Loc: Iowa
There are other options, that I'm sure others will offer advice. I don't have such problems with my EP500 and front projection environment.
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#149477 - 10/15/06 08:02 PM Re: Sub emits low hum/buz [Re: SirQuack]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 18044
Loc: NoVA
Ye olde ground loop problem. Others will be along shortly with advice...
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#149478 - 10/15/06 08:47 PM Re: Sub emits low hum/buz [Re: jonn21]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6789
Loc: The Peoples Republic of Il.
Here is an article by Alan that covers ground loops. As a temporary fix you could try a cheater plug. If you try this make sure not to connect it to the cover screw, you want to lift the ground.

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#149479 - 10/15/06 11:59 PM Re: Sub emits low hum/buz [Re: jonn21]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10621
Jon, the fact that unplugging the TV audio got rid of the hum indicates that it's most likely a ground loop related to a cable TV input. You can buy one of the cable ground loop isolators. In the meantime, you can try to partially remove the RCA plug so that the center conductor still makes contact and transmits the TV sound, but the outer shield doesn't make contact and carry the hum into your receiver.
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#149480 - 10/16/06 10:40 AM Re: Sub emits low hum/buz [Re: jonn21]
alan Offline

connoisseur

Registered: 01/29/02
Posts: 3258
Loc: Toronto/New York/parry Sound
Hi jonn21,

As JohnK mentioned, your incoming video signal from cable TV is almost always the source of subwoofer/TV/receiver ground loops.

Here is a link to Axiom's ground isolator, which goes between your incoming cable-TV feed and the set-top box or your TV's cable input.

http://www.axiomaudio.com/groundisolator.html

The ground isolator causes no degradation of digital or HD digital services. However, it cannot be used with satellite TV feeds of any kind.

By the way, your cable system may supply you with one of these if you complain. I've heard of one that did.
_________________________
Alan Lofft,
Axiom Resident Expert (Retired)

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