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#153234 - 12/08/06 08:09 PM Sub hum won't go away
Stymie Offline
veteran

Registered: 08/17/06
Posts: 132
Loc: Edge of Distraction
Need some additional troubleshooting steps as the standard ones aren't working. Unless I'm doing something wrong, which is very possible.

My system had been playing for several hours when the sub started humming very loudly. I shut everything down (switching off the power on the EP500) thinking it may have gotten hot or something. So, I waited an hour or so and switched the 500 back on before turning on the revceiver. The 500 started back with the hum. Ground loop issue? I unplugged the line in on the 500 and it still hummed. I then moved the 500 plug (all components are plugged into a Tripplite HT10DBS)to a different circuit. Still she hums. This is with the line in disconnected from the sub. I then disconnected the incoming cable connection from the HT10DBS. It feeds into this before it feeds into the cable box. Still she hums. I then disconnected the outgoing cable from the HT10DBS that actually feeds the cable box. So, incoming is disconnected from the HT10DBS and the outgoing is disconnected. The line in on the sub is disconnected and the plug is on a different circuit via a construction grade extension cord. I even tried using a two prong plug to eliminate the ground prong. No dice.

Any suggestions? I was planning to head to the store to get an isolator, but if the cable is disconnected from the equipment and it's still humming, would it make a difference?

This really blows as I was planning to watch Miami Vice the movie tonight.

All suggestions are appreciated.

Edit: Meant to add that I also removed the chasis ground on the back of the 500 and it still hums. Just to clarify, there is nothing connected to the 500 during these tests.
Stymie


Edited by Stymie (12/08/06 08:16 PM)
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#153235 - 12/08/06 09:57 PM Re: Sub hum won't go away [Re: Stymie]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10389
Sty, from your description it appears that you've taken all the steps to identify/eliminate a ground loop and that isn't the problem. Especially since this suddenly developed after playing for quite a while it would seem to indicate a defect in the sub amp. Probably you should contact Axiom directly as to how to proceed.
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#153236 - 12/08/06 10:04 PM Re: Sub hum won't go away [Re: JohnK]
Stymie Offline
veteran

Registered: 08/17/06
Posts: 132
Loc: Edge of Distraction
Thanks for the reply John. Contacting Axiom was my next course of action. I was hoping that I missed something though.
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#153237 - 12/08/06 11:32 PM Re: Sub hum won't go away [Re: Stymie]
Ajax Offline
axiomite

Registered: 12/30/03
Posts: 6250
Loc: Cleveland, Ohio
Gotta agree with John. Give Axiom a call. Sorry you have to go through this. The good news is, Axiom will take good care of you.
_________________________
Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton

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#153238 - 12/09/06 04:53 AM Re: Sub hum won't go away [Re: Stymie]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
Quote:

This really blows as I was planning to watch Miami Vice the movie tonight.


Did you, by any chance, let on to the sub that you were about to watch THE MIAMI VICE MOVIE?!?

I'd try to rule out suicide before calling Axiom.

Bren R.

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#153239 - 12/09/06 07:52 AM Re: Sub hum won't go away [Re: Stymie]
real80sman Offline
connoisseur

Registered: 05/16/02
Posts: 1124
Loc: Ontario, Canada
Stymie,

Have you tried step 8 in your manual?

Quote:

GROUND LOOP:
If your subwoofer is producing a 60 Hz hum; remove the Chassis Ground Screw. If this does not solve the 60 Hz hum, call 1-866-244-8796 or consult the full manual at www.axiomaudio.com/manual_ep500600.html





This may take care of it.
_________________________
Shawn

Epic 80/600 + M3's + Custom Finish Algonquin V3's

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#153240 - 12/09/06 09:36 AM Re: Sub hum won't go away [Re: real80sman]
MarkSJohnson Online   happy
shareholder in the making

Registered: 09/27/04
Posts: 10886
Loc: Central NH
Shawn:

Stymie wrote:
Quote:

Edit: Meant to add that I also removed the chasis ground on the back of the 500 and it still hums.




So it looks like he DID try that....
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#153241 - 12/09/06 10:28 AM Re: Sub hum won't go away [Re: MarkSJohnson]
real80sman Offline
connoisseur

Registered: 05/16/02
Posts: 1124
Loc: Ontario, Canada
Well, there you go! I read his post twice and missed it both times. I really need to SLOW DOWN and absorb everything I read before replying.
_________________________
Shawn

Epic 80/600 + M3's + Custom Finish Algonquin V3's

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#153242 - 12/10/06 12:51 AM Re: Sub hum won't go away [Re: real80sman]
Stymie Offline
veteran

Registered: 08/17/06
Posts: 132
Loc: Edge of Distraction
I opened a ticket with Axiom this morning and they're going to get back to me with the next steps. Hopefully it's not fatal.

Maybe I should have gone with Superman over Miami Vice.
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#153243 - 12/10/06 10:37 AM Re: Sub hum won't go away [Re: Stymie]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13333
Loc: Iowa
So have you tried removing the ground screw as mentioned above?
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M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
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#153244 - 12/10/06 11:00 AM Re: Sub hum won't go away [Re: SirQuack]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6720
Loc: The Peoples Republic of Il.

It's been said 3 times he already tried removing the ground screw.
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"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#153245 - 12/10/06 11:06 AM Re: Sub hum won't go away [Re: Wid]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13333
Loc: Iowa
Hey man, any chance you tried removing the ground screw.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#153246 - 12/10/06 11:34 AM Re: Sub hum won't go away [Re: SirQuack]
Stymie Offline
veteran

Registered: 08/17/06
Posts: 132
Loc: Edge of Distraction
Quote:

Hey man, any chance you tried removing the ground screw.




I......will......not......succumb.....to.....peer pressure!!!

I think I'm having LFE withdrawal.


Edited by Stymie (12/10/06 11:35 AM)
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#153247 - 12/10/06 03:47 PM Re: Sub hum won't go away [Re: Stymie]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13333
Loc: Iowa
Have you ruled out your house wiring? Maybe run a very long extension cord to your neighbors to see if you still get the hum.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#153248 - 12/10/06 04:58 PM Re: Sub hum won't go away [Re: SirQuack]
real80sman Offline
connoisseur

Registered: 05/16/02
Posts: 1124
Loc: Ontario, Canada
I know for sure that I wouldn't get the HUM at the neighbours. But then again, I don't get the HUM here either.
_________________________
Shawn

Epic 80/600 + M3's + Custom Finish Algonquin V3's

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#153249 - 12/10/06 05:40 PM Re: Sub hum won't go away [Re: real80sman]
danmagicman7 Offline
connoisseur

Registered: 12/16/05
Posts: 1467
Have you tried turning the sub off?
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M22s|VP100|QS4s|HSU STF2

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#153250 - 12/10/06 06:57 PM Re: Sub hum won't go away [Re: SirQuack]
Stymie Offline
veteran

Registered: 08/17/06
Posts: 132
Loc: Edge of Distraction
Quote:

Have you ruled out your house wiring? Maybe run a very long extension cord to your neighbors to see if you still get the hum.




Unfortunately, that's not an option. If Axiom doesn't have a quick fix, I may take it to a friend's house to see if it does it over there.


Quote:

I know for sure that I wouldn't get the HUM at the neighbours. But then again, I don't get the HUM here either.




Bummer, no hummer.




Edited by Stymie (12/10/06 07:01 PM)
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#153251 - 12/10/06 07:25 PM Re: Sub hum won't go away [Re: Stymie]
real80sman Offline
connoisseur

Registered: 05/16/02
Posts: 1124
Loc: Ontario, Canada

_________________________
Shawn

Epic 80/600 + M3's + Custom Finish Algonquin V3's

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#153252 - 12/10/06 07:37 PM Re: Sub hum won't go away [Re: real80sman]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13333
Loc: Iowa
Yeah, that 80's guy is starting to get up there in age. As am I, ha ha
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#153253 - 12/10/06 10:59 PM Re: Sub hum won't go away [Re: SirQuack]
PC_Innovations Offline
newbie

Registered: 12/10/06
Posts: 1
You may want to try & unplug your cable box. It's fairly common in my area to have this be the problem. If it goes away, you may want purchase one of these Ground loop isolation transformer Works like a champ everytime for us.

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#153254 - 12/11/06 12:45 AM Re: Sub hum won't go away [Re: PC_Innovations]
danmagicman7 Offline
connoisseur

Registered: 12/16/05
Posts: 1467
Quote:

You may want to try & unplug your cable box. It's fairly common in my area to have this be the problem. If it goes away, you may want purchase one of these Ground loop isolation transformer Works like a champ everytime for us.




He's already done that.
_________________________

M22s|VP100|QS4s|HSU STF2

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#153255 - 12/11/06 06:20 AM Re: Sub hum won't go away [Re: danmagicman7]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5408
Loc: Bowmanville, Ontario, Canada
Does the sub hum if you disconnect it from all the audio equipment ? Don't play with the levels, leave everything as is, just disconnect the audio cables.

EDIT -- in the original post it said the sub hummed even when the line in was disconnected. Folks, I don't think this is a ground loop.


Edited by bridgman (12/11/06 06:25 AM)

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#153256 - 12/11/06 02:02 PM Re: Sub hum won't go away [Re: bridgman]
FordPrefect Offline
connoisseur

Registered: 07/05/02
Posts: 1334
Loc: Ancaster, Ontario
perhaps it doesn't know the words......
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#153257 - 12/13/06 06:08 PM Re: Sub hum won't go away [Re: FordPrefect]
Stymie Offline
veteran

Registered: 08/17/06
Posts: 132
Loc: Edge of Distraction
Well, the 500's amp has been removed and is on the slow train to Canada.

I've been complaining to my wife about missing the 500's contribution to movies and such and she indicated that she couldn't tell the difference!

Hmmmm..... maybe I should get a second 500. I think she'd notice two of 'em.
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