I have been reading about Ground Loops, and have tried to troubleshoot to success, and am having an issue I would like some input on.
I replaced a 2 prong Yamaha subwoofer with a 3 prong HSU VTF-2 Subwoofer. When I did this I had a horrible hum. I diagnosed it down to a ground loop, and a lot of it was coming from my coax cable. I had comcast come out and ground it out, but I still have about 10% of the noise.
I purchased a ground loop isolator http://r.ebay.com/bLFqWO
and it also reduced the sound somewhat, but I still have a hum.
I can use a cheater plug, and that reduces it completely, but I just don't feel wonderful about using one.
1. Is the isolator I purchased such a crappy one, that I should buy a better one?
2. Should I try a directional cable? (as described here) http://oreilly.com/pub/h/4241
3. Blue Jeans cable suggested that if I rewired my the cable run with their LC-1 cable, that that should fix it?
Is there anything else you guys need to know?
Thanks a ton in advance.