Denon AVR-1612 buzzing sound PC 3.5mm audio out
I have a Denon AVR-1612 connected to my PC's 3.5mm audio out jack for sometime. Lately I've noticed a very loud buzzing when the PC audio out is connected to the Denon's V.Aux audio in from the front panel.
Once I was able to move the cable and the buzzing disappeared until I moved and reconnected the audio cable again. This happened only once and moving the audio cable currently has no effect on the buzzing sound.
Th 3.5mm stereo audio cable from the PC audio out is connected to a 3.5mm to RCA stereo Y spitter that's connected to the Denon V.Aux in on the front panel.
After going into the AVR-1612 setup and playing around with various settings and adjustments including cross-over frequency, etc. The buzzing has subsided somewhat when the AVR's volume is around -10 - 12 db however it's starts to become significant at around -8 db, higher volumes the buzzing starts to become bad again.
I'm planning on purchasing a Ground Loop Isolator such as a Boss B25N. Also perhaps getting another audio cable and installing some ferrite cord noise suppressors on both ends of the audio cable.
I'm wondering what else I can do to test and eliminate the buzzing noise? Try other connectors and cables?
I'm unable to isolate the interference that's causing the buzzing. I've tried moving around and reconnecting the speakers and cables. Moving the PC to AVR audio cable, moving around any other cables near the PC, AVR and speakers.