Originally Posted by kaigoss69
So are you now using the high level outputs? I have a HD600 and a HD900. The HD600 is dead silent. The noise on the HD900 reduces slightly when I unplug all RCAs but does not go away. They are both grounded at the same location. So one of your Amos had noise and the others didn't just like in my case?
Any updates on this? I'm concerned.