So continuation from my receiver dying on me..... Setup is was marantz as pre, hafler p3000 amp, either Wharfedale 10.1 or Elac uni-fi speakers with Oppo and TT connected to it. There is also cable, a ps4 and ps3 connected to the tv, but I am driving that right to the tv for now trying to figure out the issues, so not connected to marantz. Also have computer, router and modem in this room but plugged into different outlet and surge protector. I have tried everything I can possibly think of to fix my issues First, had a hum coming from speakers when I added my phono stage (Vincent Phono 8). It’s the only piece of equipment I have that even has a ground connection on the back. Never got any hum with other pre’s I used. TT is a TEAC TN300 which is internally grounded. There is no ground connection on marantz or hafler. I was never was able to figure that out.... Friday night I did a test of unplugging everything from the receiver to start connecting things one at a time. Started with my Oppo. Hum went away for the night, all good. Saturday switched from wharfedale to unifi speakers. Still ok in the morning and afternoon. Saturday night my marantz NR1403 died on me. I had a 1608 in another room so trying that one yesterday and getting a hum again. The hum goes down as I turn down the gain on the hafler. Tested the outlets themselves and they are properly grounded. The phono pre is out of the equation at this point. Tried plugging things in different outlets. Never had these issues with my cheap ****ty Sony system and CD player If anyone has any suggestions (other than get rid of the A/V receiver, because that can’t happen now and friends have similar ones and don’t have this issue) PLEASE send them my way. I really don’t want to return these great speakers and the amp to my buddy and go back to cheap garbage.