I'm having a tough time getting rid of a ground loop hum in my home theater, and I'm looking for some tips.
My theater consists of:
- Denon AVR-2809 (2 prong power cable)
- Rotel RMB-1075 (2 prong power cable)
- Epson 1080UB projector (3 prong power cable)
- Sony blu-ray player (2 prong power cable)
- PS3 (3 prong power cable)
- Xbox 360 (2 prong power cable)
- Wii (2 prong power cable)
- Squeezebox (2 prong power cable)
- SVS Sub (3 prong power cable)
- Satellite receiver
With just that equipment everything was working great. No issues. Everything is run off the same circuit, but due to the location of the projector and sub, they are off a different outlet. I have moved them closer and tried off the same outlet, without success. Everything else is plugged into an APC Power Bar.
I added a Wyred 4 Sound DAC-2 in the hopes of improving my 2 channel experience, and now I've got a hum.
I'm using the HT bypass feature, so my front left and right go through the DAC, then to the Rotel. My surrounds and centre go direct from the Denon preouts to the Rotel.
I can make the hum disappear by disconnecting the HDMI cables for the projector, PS3 and satellite. If any of those are connected it will hum. I've completely removed the satellite from the equation (coax unplugged, HDMI unplugged, power unplugged) and it will still hum with the PS3 and/or projector, so it's not just ungrounded coax.
I can also make the hum disappear by disconnecting the interconnects for the surrounds and centre channels to the Rotel.
Lastly, if I use a cheater on the DAC power cable, the hum is gone.
Any advice on what to try? Since the cheater works, what would be a safe alternative, since I know cheaters are not to code, and am not interested in something that could be a potential risk.
I've tried grounding the Denon to the outlet, with no success. I'm really at a loss as to what to try.