Noise coming from subwoofers and centre channel

The HDMI isolator seems to be very expensive more than 1000 $ CAD.

Also, i hope those isolator are compatible with Dolby atmos, HDR, 4K etc....

I think most of the model are not 4K 120hz 60hz.

yes, in fact, there is an unconnected coaxial cable, which was used by a former TV provider several years ago. Do you think there may still be signal even though I haven't been with this provider for years and have never had a ground problem in 10 years?

Hi,

the projector and the processor are on the same circuit…

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 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.

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.

Okay now, I removed the two HDMI cables on the processor, projector out and Zappiti player in, the noise disappeared completely. I reconnected the center to the external amplifier and there is no noise either. So it’s the video part that causes this problem. First time in 2 decades that this has happened to me...

I’m going to buy two 3 to 2 sockets, it’s not expensive.

I hope it’s not too risky to use such a socket.

I will send an email to Hegel for their opinion. thanks for the advice

Good evening, Nice testing evening!

1-I installed a 3 two 2 pong on the AVR: no change :-(

2- I added another adapter to the Hegel external amplifier: it really doesn't like the socket, very loud buzz :-(

3-I remove the Hegel one and put it on my Madvr Envy processor: I was starting to get discouraged, I put my ears on the central channel and my subwoofers, I still hear a slight buzz and crackling but I would say 70% less loud ... :-)

4- I say to myself, I'm going to add one to my JVC NZ9 to see.... and yes there is NO MORE NOISE!!!!!!!

Does it exist another solution that would have the same result as this electrical outlet? I find it strange to connect a small piece of plastic to a fairly high-end cable. In addition, is this a risk for my projector and processor? Can performance be affected? it is still 2 products worth 45K.....

IFI GND defender?

Thanks again for your good advice, I really appreciate it, thank you all

Hi good afternoon,

I only use a powerbar. Here a link of my model. All my power cable are from Bis audio ( 3prong plug)

BIS Audio PowerBIS Maestro A/C Power Bar + AC20WG A/C Power Cord Review – NOVO Audio and Technology Magazine

Thank you for your findings. Indeed, I am happy to have made the discovery but I do not want to put my system and our security at risk....with the cheater plug...

Hi,

No my system is not connected to any TV cable.

Thanks for sharing.

I tried an IFI defender socket this evening, without success, doesn't change anything.
 

All my electronics are on the same circuit, same powerbar.

The Audience Adept arp1 seems interesting at reasonable cost.

Hi,

Yes my power strip is plug via 3 prong.

I did the test to plug the equipement one by one, the noise is really introduce when the projector and processor are in action.

No it is heavy (JVC-NZ9) it would be complicated...

For the HDMI isolator, how it would works. My HDMI is connected between my projector and processus and then, it to my AVR.

Where do we connect this isolator?

Thanks

Could something like this possibly solve the problem?

FIBBR FIBBR Câble à fibre optique HDMI 8K 48 Gbit/s ultra haut débit 8 K 60 Hz 4 K 120 Hz 144 Hz HDR/eARC dynamique compatible avec PS5, Xbox Series X, PC, TV (5 m) : Amazon.ca: Électronique