Originally Posted by Kal Rubinson
Yes, it does sound like a ground loop and, often, it is the cable/satellite input to the plasma that is the culprit. The OP should describe his system setup for us.
My system consists of:
Anthem AVM50/ARC pre/pro;
Bel Canto eVo4 bridged driving my mains;
Simaudio Titan 200W x 5 driving center, surrounds and rears;
Rotel RCD-991 CD player;
Oppo 970HD dvd;
Bell 9200 HD satellite PVR receiver;
Paradigm Signature S2 and C3 V2 speakers;
Velodyne DD15 sub;
Panasonic 58PZ700 plasma.
Everything is plugged into a PS Audio Quintet.
I do have a ground loop issue which I've determined by breaking everything down and using the process of elimination and a cheater plug.
However, I don't think ground loops will give mechanical noise such as transformer hum. Ground loops give electrical hum through the speakers, and like I say, I have eliminated it by using a cheater plug, soon to be replaced with this device: http://www.ebtechaudio.com/humxdes.html
The cables feeding my TV/SAT are not causing the issue as I've investigated them as well.
So, with the ground loop issue resolved, I am looking for a means of eliminating the transformer hum. Like I say, it only appears when I turn my plasma on.
The hum from my speakers and hum from the transformer has only appeared since hooking up the eVo4. I've tried 3 other amps in it's place with no hum what-so-ever, so I'm thinking the amp itself is the root of the hums in being incompatible in a sense with the rest of my system.