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#240835 - 01/16/09 08:03 PM Humming Noise
Race Offline
frequent flier

Registered: 11/14/07
Posts: 12
Loc: Central Illinois
I just received my Axiom System today .. M80's, VP 100 Center,QS8's and a EP350 powered sub. I am getting a humming noise comming from the sub. Is the sub bad or have I just done something wrong. These are all powered by a Denon 3808.
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Bryan

Denon 3808,M80,QS8,VP100,EP350v3,Sony Bravia KDL-46XBR4,Sony BDP-S550

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#240841 - 01/16/09 08:13 PM Re: Humming Noise [Re: Race]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4097
Loc: Porch,enjoying Bombay Sapphire
Hello Race

I do not think the sub is bad nor you did anything wrong. This sounds like a ground loop which is a common problem when adding a subwoofer with a 3 prong cable.

The easiest solution in solving and fixing the hum is simply to pick up a cheater plug (3 prong to 2 prong adapter) which simply lifts the ground and will get rid of the hum. They usually cost $1-$2 dollars at any hardware store. If you are not comfortable using a cheater plug here is an excellent article on ground loops.

http://www.audioholics.com/tweaks/connec...em-hum-and-buzz

Congrats on your purchase BTW \:\)
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Iím armed and Iím drinking. You donít want to listen to advice from me, amigo.

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#240844 - 01/16/09 08:55 PM Re: Humming Noise [Re: BlueJays1]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6744
Loc: The Peoples Republic of Il.
From the linked article.

"NEVER use a three prong to two prong AC adapter to fix a ground loop problem. These devices are meant to provide a safety ground (via the cover plate screw to a grounded outlet) in the event a three prong plug is used with a two prong outlet. It is always best to lift the ground safely at line levels."


Alan has a good article on ground loops here.
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#240850 - 01/16/09 09:16 PM Re: Humming Noise [Re: Wid]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4097
Loc: Porch,enjoying Bombay Sapphire
 Originally Posted By: wid
From the linked article.

"NEVER use a three prong to two prong AC adapter to fix a ground loop problem. These devices are meant to provide a safety ground (via the cover plate screw to a grounded outlet) in the event a three prong plug is used with a two prong outlet. It is always best to lift the ground safely at line levels."


Alan has a good article on ground loops here.


Using a cheater plug is good idea to troubleshoot the hum and still can be used as last resort or if you are lazy like me and can't be bothered to find the hum and just use a cheater plug anyways.

Not recommended!


Edited by Dr.House (01/16/09 09:33 PM)
Edit Reason: Wid made me paranoid
_________________________
Iím armed and Iím drinking. You donít want to listen to advice from me, amigo.

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#240853 - 01/16/09 09:21 PM Re: Humming Noise [Re: BlueJays1]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6744
Loc: The Peoples Republic of Il.

That's all well and good but I wouldn't advise it to others for fear of liabilities. It wouldn't be good to have someone get hurt on that advise. Call me paranoid.
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#240854 - 01/16/09 09:24 PM Re: Humming Noise [Re: Wid]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4097
Loc: Porch,enjoying Bombay Sapphire
Totally understandable, that is why I told him if he is not comfortable using a cheater plug to read the link below.
_________________________
Iím armed and Iím drinking. You donít want to listen to advice from me, amigo.

-Max Payne

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#240855 - 01/16/09 09:27 PM Re: Humming Noise [Re: BlueJays1]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6744
Loc: The Peoples Republic of Il.

Ya know I remember when, a few years back, when I bought my first Hsu sub it actually came with a cheater plug. That's the truth.
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#240859 - 01/16/09 10:05 PM Re: Humming Noise [Re: Wid]
BoB/335 Offline
aficionado

Registered: 12/26/08
Posts: 505
The MFW-15 from AV123 suggest the same thing. As a licensed electrician I can't imagine how prevalent this advice is. AV123 seems to suggest this as a permanent solution. If there is a ground hum IT'S BECAUSE SOMETHING IS WRONG. Find the PROBLEM and get it fixed!

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#240860 - 01/16/09 10:11 PM Re: Humming Noise [Re: BoB/335]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6744
Loc: The Peoples Republic of Il.

I agree and never understood Hsu supplying them either.
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#240864 - 01/16/09 10:20 PM Re: Humming Noise [Re: Wid]
BlueJays1 Offline
connoisseur

Registered: 09/19/08
Posts: 4097
Loc: Porch,enjoying Bombay Sapphire
Axiom mentions the use of cheater plugs in the EP350 troubleshooting guide with regards to hum.

http://www.axiomaudio.com/troubleshooting_ep350.html

I don't think any manufacturer out there recommends the use of cheater plugs but it is still an option.
_________________________
Iím armed and Iím drinking. You donít want to listen to advice from me, amigo.

-Max Payne

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