I have a Yamaha Rx-v1200 and an Adcom amp for my subs and rear surrounds. I'm getting an annoying hum when i have the 12v trigger cable hooked up. When i unplug the cable, the hum is gone. Any suggestions on how to eliminate this hum? Right now I have a simple 1/8 inch 2 conductor cable. Does anyone make a better cable for this? Maybe one with a high quality shielding? Or is this a more complex problem? Any suggestions are welcome. Thanx. Dave.