On June 13, 2018 at 15:31, SWOInstaller said...
Troubleshooting an install in a brand new house.
There is a ground loop coming through the sub (Current Audio FLSUB10). At first we thought it was a defective amp on the sub and Current Audio sent us a new amp. Installed the amp and issue still is present.
The sub is connected to a Denon AVR-X2400 approximately 70' away.
How is the sub connected to the Denon? Seventy Feet of unbalanced audio? I see from the specs that this sub does not have a balanced (XLR) input and the Denon doesn't have a balanced output so you either did 70 ft. of unbalanced (Hum, Hum, Hum, Hum, Hum) or you used the speaker terminals (really? People do that?)
