Subwoofer hum...
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Joined: Sep 2009
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I received my speakers a few weeks back and didnt get a chance to hook anything up until yesterday. What a treat. However, the subwoofer (EP350) is causing a humm in all the other speakers. I have a Denon AVR-3805 amp, and the sub is connected via an RCA type cable to it. I know nothing of configuring the amp and sub (filters LFE whatever) so if anyone has any pointers for me...
As soon as I unplug the sub, complete silence (no more hum). Sounds like electrical interference almost... (tried different outlets...)
Thanks,
Marc
Last edited by SUBnet.192; 10/26/09 04:22 PM.
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Re: Subwoofer hum...
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Joined: Sep 2008
Posts: 4,116
connoisseur
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Hello, This sounds like you are experiencing the dreaded ground loop. A quick way to try to eliminate the hum without any troubleshooting is simply by attaching a 3-2 prong adapter also known as a cheater plug to the end of subwoofer power cable. Just remember this is usually against electrical code and is not meant to be used as a permanent solution. The article below describes the steps needed in order to solve what component is causing the hum and how to get rid of the hum completely. The key to solving ground loops is being patient and methodical in the process. http://www.axiomaudio.com/tips_eliminate_hum.html
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.
-Max Payne
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Re: Subwoofer hum...
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Joined: Sep 2009
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Thanks for the link. Interesting read.
However, I had tried isolating the source (I unplugged the power from every component one by one and no luck.) I also unplugged the audio cable from the component to the amplifier, still no change. Only unplugging the sub got rid of it.
From reading this, the only thing I didnt try it unplugging the cable TV from the STB. Wouldnt unplugging the STB from the wall do the same thing though?
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Re: Subwoofer hum...
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Joined: Sep 2008
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Try disconnecting the cable running to the STB and unplugged. This is a common source of ground loops. Also try a cheater plug with the subwoofer power cable. You can pick them up for around $1 at any hardware store.
Can you also try this for me? Does the subwoofer hum if it is plugged into the outlet, turned on, without any cables connected to it.
Good luck!
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.
-Max Payne
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Re: Subwoofer hum...
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Joined: Sep 2008
Posts: 4,116
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I forgot to mention, there might be a ground screw present on the back of the EP350 amp (ground screws seem to be common on Axiom subwoofers). In the past they have suggested people to unscrew them if they are experiencing hum. This might solve the issue as well.
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.
-Max Payne
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Re: Subwoofer hum...
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Joined: Jan 2004
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shareholder in the making
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shareholder in the making
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I"m at work, but don't think my new 350's have a ground screw like the EP DSP series...
M80s VP180 4xM22ow 4xM3ic EP600 2xEP350 AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85
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Re: Subwoofer hum...
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Joined: Apr 2007
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If you have cable TV then that is likely the cause. If so, you might need one of these: http://www.axiomaudio.com/groundisolator.htmlWorked great for me.
-David
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Re: Subwoofer hum...
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Joined: Sep 2009
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Ok. If I unplug the sub's coaxial, it's dead silent. Once plugged I get the hum.
I unplugged the sub from the wall outlet and plugged it in to my Monster Cable (I know...) power center and it has gone down significantly but it's still there. Unplugging the coax going to the STB helped a bit more. So I guess I would need one of those Ground Isolators, but that doesn't seem to fix everything...
There is a ground logo next to a regular screw behind the EP350. I'll try removing it...
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Re: Subwoofer hum...
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Joined: Feb 2007
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The only fix for me was to buy the ground isolator. Problem fixed.
-- Denon 4520, EPIC80/500/VP180 Speakers
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Re: Subwoofer hum...
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Joined: Sep 2008
Posts: 4,116
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Does the screw look like this below. Otherwise I would not unscrew it. When looking at the EP350 guide just now it does not say anything about a ground screw being present. http://www.axiomaudio.com/troubleshooting_ep500.html#This is what the one on the EP500 looks like. click on view chasis ground screw
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.
-Max Payne
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