Noise coming from subwoofers and centre channel

This might be overly simplistic, but what about just trying some cheater plugs?

- Turn off subwoofers and see if noise is coming from the center

- Turn on one subwoofer at a time and see when the noise starts

- Unplug/Replug the subwoofer cables, try a different cable

- Is there a PC on a UPS or something plugged into the same line. Turn that off

etc. etc, (narrow down on what’s creating the noise by process of elimination)

If the sound shows up only on the center channel and subs (not the fronts??), i am also inclined to believe that it may be something with the av processor/receiver. Check all cable connections, check for sht failing cables, make sure everything’s plugged in where it’s supposed to be, etc.

Good evening,

yes the cheater plug are on my list.

What i did tonight is to disconnect all my rack audio, a nightmare as i have many electronics…

I only have connected my 2 channel setup, front Dunlavy SC-4, 2 funk subwoofer, Mola Mola Tambacqui, antipodes K50 and finally Hegel H590.

For the moment, good news, complete silence, no hmm, no hiss. 

i will continue tomorrow, i will integrate my AVR, player, projector, processor one by one.

What do you think guys IFI gnd defender?

Thanks for all your comments.

I used to have a complicated multichannel rig and multiple stereo rigs all in one room (until i finished/managed to move all stereo gear to another room. It was indeed a nightmare looking behind multiple racks with heaps of sht, gear and cables everywhere.

I was going to suggest could it be the projector has another ground path??  Try turning it on without any video cables attached.