2. speakers
  3. 1130010212

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
snofun3
599 posts
 
Nothing like a hummer. No, seriously, let's see if AGon will let this through (2nd try), while DK ads are rountinely permitted.
In any case, not trying to be a wise guy, but have you tried swapping the subs? If the hum moves with the sub it's the wiring, if it doesn't it's the sub.
It also sounds like there could be some kind of ground loop. Have you plugged them into the same outlet, or swapped outlets?
Get to me offline and maybe I can help. I tired of trying to compete with the DK ads for thread space.
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
dlstephenson
121 posts
 
Just purchase a Blue Circle BK-86. It will take care of it and you wont have to unGROUND your equipment.
gold
45 posts
 
Cheater plug is the easiest fix...If you don't like the looks of those things try a Monster Power HTPS 7000. I am amazed at how well this unit cleans up the hum.
deechisound's avatar
deechisound
8 posts
 
Get a ground loop isolator, I had the same problem with my sub and my tubes. I got mine from parts express.
More to discover