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#283257 - 12/21/09 08:33 AM Can't kill the humming in my sub..help
iammongo Offline
frequent flier

Registered: 08/09/07
Posts: 16
Iím hoping someone out there can help me out with this humming problem. Itís starting to drive me nuts.
I have an axiom system with the EP500 sub, Iíve been getting that 60hz buzzing for quite awhile now, itís 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.
Iíve done some research and tried some things but everything so far has failed. Hereís what Iíve 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 interferenceÖno change
4) Plug into different outlets .. sometimes gives temporary relief
5) Unplug the input cable from subÖthis works which makes me think it isnít my electric..?
When I was trying these methods I ran across something really strangeÖI noticed that when I walk towards the sub the hum gets louder the closer I get.
Iím all out of ideas, the sub cable Iím using came from monoprice and I believe it is shielded. Iím willing to try about anything EXCEPT ordering a cable from monster! :P
Any ideas?

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#283259 - 12/21/09 09:05 AM Re: Can't kill the humming in my sub..help [Re: iammongo]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4116
Loc: Porch,enjoying Bombay Sapphire
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?

_________________________
Iím armed and Iím drinking. You donít want to listen to advice from me, amigo.

-Max Payne

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#283261 - 12/21/09 09:41 AM Re: Can't kill the humming in my sub..help [Re: BlueJays1]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
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

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#283264 - 12/21/09 09:49 AM Re: Can't kill the humming in my sub..help [Re: ClubNeon]
iammongo Offline
frequent flier

Registered: 08/09/07
Posts: 16
Will do that....thanks for the advice

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#283265 - 12/21/09 10:06 AM Re: Can't kill the humming in my sub..help [Re: iammongo]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 18044
Loc: NoVA
If it's happening without anything attached to the sub other than power, it's a problem with the amp. Call or email Axiom.
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I am the Doctor, and THIS... is my SPOON!

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#283268 - 12/21/09 10:26 AM Re: Can't kill the humming in my sub..help [Re: Ken.C]
iammongo Offline
frequent flier

Registered: 08/09/07
Posts: 16
nope, with the sub just plugged in there is no noise

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#283269 - 12/21/09 10:28 AM Re: Can't kill the humming in my sub..help [Re: Ken.C]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4116
Loc: Porch,enjoying Bombay Sapphire
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.
_________________________
Iím armed and Iím drinking. You donít want to listen to advice from me, amigo.

-Max Payne

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#283284 - 12/21/09 12:42 PM Re: Can't kill the humming in my sub..help [Re: BlueJays1]
Hansang Offline
aficionado

Registered: 02/07/07
Posts: 602
Loc: New York
I just bought a ground loop filter from Axiom and my problem went away.
_________________________
--
Denon 4520, EPIC80/500/VP180 Speakers

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#283287 - 12/21/09 12:59 PM Re: Can't kill the humming in my sub..help [Re: Hansang]
davew Offline
buff

Registered: 02/25/08
Posts: 44
Loc: San Jose, CA
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?

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#283290 - 12/21/09 01:18 PM Re: Can't kill the humming in my sub..help [Re: davew]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4116
Loc: Porch,enjoying Bombay Sapphire
Good call davew.
_________________________
Iím armed and Iím drinking. You donít want to listen to advice from me, amigo.

-Max Payne

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