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Subwoofer has a Hum

I have two Martin logan Descent subs. The one sub has a slight hum, the other one is fine. both are hooked up to my Bel Canto pre2p preamp through rca outputs.
I tried changing the pc, used a cheater plug to by pass the ground. I have all dedacated circuits for my gear. There is no hum in my main speakers which are the ML Ascenti. The sub hum is reduced when I remove the ic going to it. I tried to switch the ic's, use differant outputs on the preamp. I still have the slight hum coming from only the one sub.
Can anybody give me some advice in this matter.

Thanks
Russ
russb

Showing 2 responses by russb

russb OP
91 posts
 
Nsgarch
I am using Audioquest dimoundback. If i hook up the ic in mono two to one sub the hum is gone. i seem to only have the hum when i hook up in stereo one ic to each sub. i am using a sound meter to measure the output of the hum in each sub. they are pretty much equal with no ic's hooked to them. When i hook up the ic's to each sub the hum will peg the meter at 60hz 10 inches away from each sub. i would appreciate any help you can give me.

Thank You
Russ
russb OP
91 posts
 
Thanks everybody for your help. I fixed it with Nsgarch suggestion of using two cheater plugs on both subs. I guess I had a ground loop problem. I also changed direction of current flow with My ic's
Thank You
Russ
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