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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 1 response by nsgarch

nsgarch's avatar
nsgarch
2,524 posts
 
Without knowing what kind of (RCA?) ICs you're using, point the arrows back to the preamp instead of toward the amp or subs. Leave the cheaters on the subs PCs and on the amp(s) PC(s). Do ground the preamp.

I'd still like to know what kind(s) of ICs you're using. Oh yeah, and make sure they cross any power cords at right angles, and don't run them right along the baseboard, they might be paralleling an AC line in the wall.
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