Noise coming from subwoofers and centre channel

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.

@vampat  Your trouble shooting is in the pipe 5x5. Nice system.

Hi,

Well, I have something new, I continued my tests. Here are my findings.

I opened all the devices of my 2 channel audio system (Tambacqui, K50 and Hegel H590 complete silence.

Then, I connected the Madvr Envy video processor and nothing complete silence

Then I integrated my Hegel C55 5 channel amplifier, I only connected the center. Still complete silence. Now I integrate the arcam AVR-30 receiver, we can hear a slight electrical noise in the center channel and a slight rumble in the subwoofers.

Finally,  there it is, I connect an HDMI cable between the processor and the receiver and an HDMI cable between the receiver and my Zappiti player, the noise is really louder in the subwoofers and the center channel.

So, I understand that my problem occurs when a signal goes through the HDMI, what do you think?

Should I try a cheater plug and connect the receiver?

Thanks.

I did another test and connected my center directly into the receiver. Now the noise disappears in the center compared to when connected in the external amplifier. However, the noise is still present in the subwoofers... All my devices are connected on the same circuit, it's a circuit just for my electronic devices.