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#385989 - 11/21/12 10:21 AM Re: Hum from Subwoofer [Re: Davidworks]
Davidworks Offline
regular

Registered: 11/20/12
Posts: 7
would a monster power/surge box clean the noise or block the loop?

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#385996 - 11/21/12 01:38 PM Re: Hum from Subwoofer [Re: Davidworks]
cb919 Offline
connoisseur

Registered: 02/17/09
Posts: 1041
Loc: Ottawa, Canada
Not sure as I am not a subject matter expert. However what I was recommending was one of these which is what I used since I had one lying around.

Or you can just buy a ground loop isolator from Axiom or other sources which may be easier than the grounding block I suggested.
_________________________
Dan
In/On Wall 500 w M2 Center Channel

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#386003 - 11/21/12 05:15 PM Re: Hum from Subwoofer [Re: Davidworks]
Davidworks Offline
regular

Registered: 11/20/12
Posts: 7
that looks like a great idea.....but the only connection I have to Rogers is from the modem through the boxee to the amp......would it make it that far? I have a very strong feeling its a ground loop, but I am trying to figure out the best way to break the loop without having to run an extension cord to the kitchen....so to say....

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#386005 - 11/21/12 06:49 PM Re: Hum from Subwoofer [Re: Davidworks]
cb919 Offline
connoisseur

Registered: 02/17/09
Posts: 1041
Loc: Ottawa, Canada
For $5, why not try one from The Source? You'll just need a short piece of coax to connect to wherever you put this in line. Of course you'll also need a copper wire to make the ground connection.

I grounded my Rogers coax right at the demarcation as i had access to the house ground of my fuse panel right there. That is about 50 feet of coax (and a few splitters) away from where I was getting my ground loop hum when my PVR was connected into the HT.

Also I recall somebody mentioned once when this topic was discussed before that you could try calling the provider and ask them to come change/improve the ground of their cable into your house.

Good luck!
_________________________
Dan
In/On Wall 500 w M2 Center Channel

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#386031 - 11/22/12 09:13 AM Re: Hum from Subwoofer [Re: Davidworks]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13309
Loc: Iowa
I am not familiar with what Rogers and/or Boxee is that you keep referring, but when I had a hum like this I was able to stop it two ways.

1) Unplug the coax feed from my wall to the direct tv box. Also, if I cut back the outer part of the coax, and lifted the ground cutting back and exposing about an inch of only the wire, the sound would.

2) Placing a cheater plug on my sub to the outlet was another way to elimate the noise.

Right now I use the cheater plug for my 350 subs. The 600 stopped humming as soon as I removed the included ground screw.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
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#386051 - 11/22/12 05:22 PM Re: Hum from Subwoofer [Re: Davidworks]
exlabdriver Offline
aficionado

Registered: 09/07/11
Posts: 801
As I've detailed elsewhere, I had persistent hum from my twin Velodyne subs. I suspected the Shaw Cable installation after much reading on the net. What was interesting is that a 'Customer Review' at Future Shop slammed this model (DLS-3750) for having a loud hum & he returned 2 of them to FS. It most likely wasn't the sub's fault at all.

After many unsuccessful experiments over considerable time, the only method that completely killed my hum was to attach a jumper wire from the outside barrel of one of the unused subs' RCA Jacks to the outside barrel of an unused RCA Jack on my Sony XBR TV. Alligator clips work great for this or you can build a harness using only the outside connection on the RCA Plug.

Interestingly, attaching the jumper to the Cable TV Coax outer shield did not work.

Good luck...

TAM

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