Parasound HCA 2200 Hum problems

Hello , my2200 does not hum, i was wondering if youve heard of turning the bias up on the 2200 i hear it sounds better,,,,, have you heard of this , and if so could you explain how to do this please.... any info would be greatly appreciated...... JC...

was interested to see this,thought mine was isolated problem my 2200 11 hums thru transformer,what can be done?

I have a Parasound 1206. I'm all for a lower noise floor. Any suggstions would be appreciated.

I have a Parasound HCA 1200 II that hums through the center and surround channels (not driven by the amp) unless I disable the ground.

My CD player sends a signal into the television sets in all of my rooms with them and creates herringbone lines on a couple of channels. It does this when set to standby or powered up for play. If turned off completely there is no problem. I do not play the set next to it wwhen listening but others are annoyed watching sets on these channels in other rooms. A power conditioner did not help even plugged into the designated didgital sockets. What will filter out this noise?