Question for the HT guys regarding line noise

[777php]

I recently finished setting up my home theater with a HTPC. When I went to plug the TV coax cable into the Happauge 250 on my HTPC the subwoofer started to buzz.

The chain goes as follows;
- coax into HTPC
-- DVI from HTPC to Infocus 4805
--- component from 4805 to Pioneer VSX-D811s
---- RCA composite from Pioneer VSX-D811s to Wharfedale Powercube 10 subwoofer.

I unplugged the coax cable and the buzzing stopped altogether, so at this point I figure that the line is pretty dirty and noisy. Would a line filter fix the buzzing noise? If so which ones should I buy? Do they have ones that are bundled with surge protectors? Are those not recommended?

If not line noise, what could it be?

Thanks guys.

 

[777php]

I also should mention that I have an Xbox connected to the receiver via Component

 

[MustISO]

Google "ground loop hum" and see if that's what you have. Is everything plugged into the same surge protector?

 

[777php]

no, they are plugged into three different surge protectors. The HTPC , projector, and receiver are on different ones. The sub and receiver are on the same.

so a ground loop isolator attached to my sub may do the trick?

 

[YOyoYOhowsDAjello]

Can you try plugging them into the same outlet to see if it solves your problem?

Ground Loop was the first thing that popped into my head too.

 

[777php]

I'll try pluggin them into one surge to see if that fixes the problem. I'll do it when I get home tonight. Maybe I'll pick up an isolator at Radio Shack before I go home.