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Humming Noise
#240835 01/17/09 01:03 AM
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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
Re: Humming Noise
Race #240841 01/17/09 01:13 AM
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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 \:\)


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

-Max Payne
Re: Humming Noise
BlueJays1 #240844 01/17/09 01:55 AM
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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

Re: Humming Noise
Wid #240850 01/17/09 02:16 AM
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 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!

Last edited by Dr.House; 01/17/09 02:33 AM. Reason: Wid made me paranoid

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

-Max Payne
Re: Humming Noise
BlueJays1 #240853 01/17/09 02:21 AM
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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

Re: Humming Noise
Wid #240854 01/17/09 02:24 AM
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Totally understandable, that is why I told him if he is not comfortable using a cheater plug to read the link below.


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

-Max Payne
Re: Humming Noise
BlueJays1 #240855 01/17/09 02:27 AM
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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

Re: Humming Noise
Wid #240859 01/17/09 03:05 AM
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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!

Re: Humming Noise
BoB/335 #240860 01/17/09 03:11 AM
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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

Re: Humming Noise
Wid #240864 01/17/09 03:20 AM
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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.


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

-Max Payne
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