buzzing noise when opening door

[Question Mark]

Vehicle: Volvo xc 70.

Components:

Gladen Utopia

Mosconi dsp 6to8

Mosconi Zero 4

Mosconi As 100.2

I get a summing buzzing noise in all speakers when I open the left drivers door. When I shut it. it's all good. Signal Sources coming directly from the phone. Signal cables and speaker cables are on the carpet (except the speakercables in door). Appreciate all the help I can get.

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[Mayhem]

Solid products you have there.

Is your amp by chance under the drivers seat and you’re grounding in that surrounding area? Specifically to a seat or seatbelt bolt.

Could you put your car and neutral, open the door, and give it some gas. I want to see if the sound goes up in sound/frequency with the raising of RPMs.

I can’t stand any type of buzzing or interference with my signal, it’s most likely a ground. We’ll fix this.

 

[Question Mark]

The amps are Placed in the trunk to the left side. The original battery is also placed to the left side in the trunk. the main Power cable is crossing under one of the amps, but I've tried to lift the amps away, with no help. I'm starting to think it might be the original head unit. I know there is a loop. When I ground the chassis The sound gets lower (the original ground is still Connected) As I mentioned earlier. I've tried to play signals from the phone to pypass the radio, but the radio is still Connected to the wires even thought It's turned off. I havent disconnected the radio because the chance of getting the airbag lamps lid. I can try buy a set of iso contacts to try and play another headunit tomorrow.

 

[Mayhem]

The amps are Placed in the trunk to the left side. The original battery is also placed to the left side in the trunk. the main Power cable is crossing under one of the amps, but I've tried to lift the amps away, with no help. I'm starting to think it might be the original head unit. I know there is a loop. When I ground the chassis The sound gets lower (the original ground is still Connected) As I mentioned earlier. I've tried to play signals from the phone to pypass the radio, but the radio is still Connected to the wires even thought It's turned off. I havent disconnected the radio because the chance of getting the airbag lamps lid. I can try buy a set of iso contacts to try and play another headunit tomorrow.

When you say you ground to the chassis, is that to the chassis of the HU or did you add a ground to the car?

 

[Question Mark]

When you say you ground to the chassis, is that to the chassis of the HU or did you add a ground to the car?

I ment to say the chassis of the headunit. everything is Connected directly from the battery. (exept the Power and ground to the original headunit/radio)

 

[Mayhem]

I ment to say the chassis of the headunit. everything is Connected directly from the battery. (exept the Power and ground to the original headunit/radio)

Ah ok. Are you doing the RCA to HU chassis ground?

If you can, I would add another ground to your battery. You could just use the existing ground that is there (if its good enough), just add another run.

That should lower the noise or remove it.

The thing that is weird is that it happens with the door opening...

Possibly some type of light/relay that is triggering the noise?

Sometimes this could happen from the source (phone) picks up or gives off signals that are picked up by the RCAs and gives interference. But that can't be it since its good when the doors shut.

 

[Forcefed2002]

Some vehicles have a circuit that keeps power to hu until it thinks you've exited the vehicle, by opening drivers door, it opens the circuit via the plunger in the hinge area of door. Any correlation you reckon?

 

[macsdad 10+ year member]

I must say that I am impressed with this thread, no tom foolery, just honest advise to actually help a brother addict I mean audiophile. And nice equipment dude, it would drive me crazy to have that nice of a set up and have this type of issue with it. Good luck with your troubleshooting. I hope it is a simple fix.