Subwoofer Humming - AVS Forum
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post #1 of 7 Old 01-26-2012, 09:55 AM - Thread Starter
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Hello,

I'm having some problems with subwoofer humming I can't figure out. Ive tried to plug the sub into different outlets, unhook every source from the receiver, unplug the cable box, and used a ground loop isolater from radio shack. Nothing has worked. I also tried connecting the subwoofer to the lfe input and the sub/sat input. The sub/sat input had less buzzing but was still noticeable. Anyone have suggestions?

The sub does not hum when turned on and not connected to receiver.

Also, what is the sub/sat input for?

The subwoofer is a dynaudio sub 250.
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post #2 of 7 Old 01-26-2012, 04:40 PM
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If you have disconnected the rca from the sub input and get no hum when the subwoofer is powered up, try connecting the rca cable to the subwoofer and not the AVR before powering up. If you get the hum, then you might try replacing the rca cable from the AVR to the subwoofer with a new (possibly better shielded) one. Your rca cable might be picking up RF interference from someplace.
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post #3 of 7 Old 01-26-2012, 05:01 PM - Thread Starter
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I switched the RCA. It Worked. Thanks.
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post #4 of 7 Old 01-26-2012, 08:41 PM
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Sounds like power supply hum. You need better capacitors in the power supply to filter that out.
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post #5 of 7 Old 01-26-2012, 09:38 PM
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Quote:
Originally Posted by tostaylo View Post

I switched the RCA. It Worked. Thanks.

Curious if you used RG6 cable (the best), or RG59 (still very good, usually the
yellow video cable), or just the red/white audio cable. Before and after. Thanks
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post #6 of 7 Old 08-27-2012, 01:06 PM
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Quote:
Originally Posted by tostaylo View Post

I switched the RCA. It Worked. Thanks.

Could you tell me what cable you decided to use? I also have a subwoofer hum.

Hum isn't there when there is no cable attached, but there when there is one attached even if the other end is dangling in space. Leads me to believe that it is acting as an antenna as mentioned in this forum.

Most "subwoofer cables" seem to be double braid shielded. Is this typically enough? What diameter and specs do you look for and what capacitance is necessary?

I have this little guy and otherwise like it a lot. http://www.polkaudio.com/products/psw10

WARNING: You have now entered a no @#$%tard zone. Please gather your anti-vaccine propaganda nonsense and slowly back out the way you came in.
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post #7 of 7 Old 08-28-2012, 04:55 AM
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You could try a quad-shielded rca connection which you can get at Radio Shack, monoprice.com, and (possibly) home depot. It may not solve your problem if you have a ground loop which sometimes (often) originates with a poorly (or ungrounded) cable connection.

A ground loop isolator can help
http://www.parts-express.com/pe/showdetl.cfm?partnumber=265-012
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