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Can't kill the humming in my sub..help
#283257 12/21/09 01:33 PM
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I’m hoping someone out there can help me out with this humming problem. It’s starting to drive me nuts.
I have an axiom system with the EP500 sub, I’ve been getting that 60hz buzzing for quite awhile now, it’s to the point that I only plug the thing in when I want to watch an action movie and I know the buzz will be drowned out by everything else.
I’ve done some research and tried some things but everything so far has failed. Here’s what I’ve tried.
1) Remove ground screw (worked for a little bit but hum came back)
2) Bypass the ground by plugging the cord into one of those 3 to 2 prong adapters (made it worse)
3) Unplug cable TV from cable box to check for interference…no change
4) Plug into different outlets .. sometimes gives temporary relief
5) Unplug the input cable from sub…this works which makes me think it isn’t my electric..?
When I was trying these methods I ran across something really strange…I noticed that when I walk towards the sub the hum gets louder the closer I get.
I’m all out of ideas, the sub cable I’m using came from monoprice and I believe it is shielded. I’m willing to try about anything EXCEPT ordering a cable from monster! :P
Any ideas?

Re: Can't kill the humming in my sub..help
iammongo #283259 12/21/09 02:05 PM
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Hi iammongo,

Can you disconnect the subwoofer from the system all together and with all your other equipement off just plug the subwoofer into an outlet and turn it on (no subwoofer cable attached)? Does it hum, buzz, pop or make any other sounds?



I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne
Re: Can't kill the humming in my sub..help
BlueJays1 #283261 12/21/09 02:41 PM
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His #5 seems to indicate what removing the input from the receiver does indeed stop the hum. So it is a ground loop, just an extra pesky one.

I'd say, while it is humming, start unpluging things from each component, and then components themselves from the wall. When it stops humming note what you just unplugged. You can then try plugging some of the other stuff back in, and see if it does not return. Report back here with your findings for some ideas.


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris
Re: Can't kill the humming in my sub..help
ClubNeon #283264 12/21/09 02:49 PM
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Will do that....thanks for the advice

Re: Can't kill the humming in my sub..help
iammongo #283265 12/21/09 03:06 PM
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If it's happening without anything attached to the sub other than power, it's a problem with the amp. Call or email Axiom.


I am the Doctor, and THIS... is my SPOON!
Re: Can't kill the humming in my sub..help
Ken.C #283268 12/21/09 03:26 PM
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nope, with the sub just plugged in there is no noise

Re: Can't kill the humming in my sub..help
Ken.C #283269 12/21/09 03:28 PM
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Is the subwoofer brand new? How long have you had your entire setup? Have you added any new components or cables to your system? Has the hum always been present?

If you can borrow another sub cable off someone I would also recommend swapping out the Monoprice cable. I have never used a Monoprice sub cable but with other cables I have used from them the build quality can be hit or miss. It is always possible the shielding could be inadequate or the cable defective which is inducing hum. You seemed to have tried everything else.


I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne
Re: Can't kill the humming in my sub..help
BlueJays1 #283284 12/21/09 05:42 PM
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I just bought a ground loop filter from Axiom and my problem went away.


--
Denon 4520, EPIC80/500/VP180 Speakers
Re: Can't kill the humming in my sub..help
Hansang #283287 12/21/09 05:59 PM
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Could the hum come from a recently installed light dimmer or nearby fluorescent light? Or do you recall this problem starting after getting a new appliance like a refrigerator?

Re: Can't kill the humming in my sub..help
davew #283290 12/21/09 06:18 PM
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Good call davew.


I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne
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