I was hoping someone here could help me. I just installed 4 in ceiling speakers for atmos with a 7.1.4 config. I was going to buy an Emotiva amp for my fronts but the one I want is discontinued and unavailable so I have to wait for their new series. For the time being I hooked up as 7.1.2. Anyway I have my Yamaha a3050 receiver running that room and 7.1 with a 3020 reciever in another. I realized that I could probably run zone 2 from the reciever to run the other 2 atmos speakers. When I hooked it up from the pre outs to an audio in on the second reciever I got sound. When I turned up the volume to 0 db on the second reciever tho I got a loud hum only on the input of the pre outs. These are the only speakers that hum. Doing research I started looking into ground loops. I tried unplugging various device power and the only thing that made it better was the cable line being unplugged from the wall. I thought it was fixed but when I got closer to the speakers there is still a faint hum. Now I am worried this would happen to any amp I buy and I am not really sure where to go from here to completely eliminate the hum. I had unplugged everything but the two amps from the Panamax surge protector I have with no luck on changes. My Ethernet switch was unplugged too but maybe it's still carrying a signal from my router in another room? Even with the only the 3020 plugged into power and not the source reciever still gives a hum on the input the pre out is plugged to. Any ideas?