......you who now have your WHOLE system grounded by my suggestions or your methods.....turn on your receiver with the tone controls set where you usually listen with them set, and make sure every source to the receiver is turned off....(dvd player, cd player, turntable, etc)....raise the volume knob on the receiver all the way up....is that hum gone?....turn it back down and power up a source, say your DVD player, choose it on the receivers inputs, but produce no signal from the chosen source....raise the volume all the way up and see if you still hear that static....turn it back down and choose another source one-by-one until you have listened to every source you have....if you heard no hum from amp sections, or static from the sources, your 500 mains are now worth 900....all I can say is take it or leave it.....
