Problems with subwoofer, it makes engine noise when I accelerate

[FoxHound511]

 

Hi everyone, first of all sorry for my bad English.

I write from Italy, my brother owns a 2017 ford edge vignale. Weeks ago I installed a big subwoofer for it, and as usual, there is always some problem on the first start.
Usually easily fixed ... But this time I don't know where to turn. I've read here and there before, and I think the problem is with those damn microphones, and the active noise cancellation system.
Basically, when the accelerator is pressed, the subwoofer emits a noise, in sync with that of the motor.

We tried to disable the ACM system by following the instructions on this forum, but without success, absolutely nothing seems to change.
 have the obd2 key to use with forscan. If anyone knows how to help me, I would be very, very grateful. THANK YOU!

Ah, one more thing. the source of the subwoofer amplifier was taken from the old stock subwoofer, this is because my brother doesn't want to remove all the front panels to take the source directly from the radio ...

Edited February 11, 2021 by 1004ron
Correct oversize font

[enigma-2]

Almost always caused by a poor ground when aftermarket amp/sub put in.

 

Read this;

https://www.12volt-travel.com/knowledgebase/engine-noise-in-car-stereo-speakers/

[FoxHound511]

The problem is not the ground.
Since we pierced the body and scrapped off the paint.
the ground is well connected.

other solutions?

Edited February 11, 2021 by 1004ron
Correct oversize font

[1004ron]

4 hours ago, FoxHound511 said:

The problem is not the ground.
Since we pierced the body and scrapped off the paint.
the ground is well connected.
other solutions?

Best you tell us what you've tried or tested and the results to save others making pointless suggestions.

Edited February 11, 2021 by 1004ron

[FoxHound511]

The subwoofer signal is taken from the stock subwoofer located in the trunk, the signal cables are led into an rca signal converter (impact k44)
the rca signal is then fed to the subwoofer amplifier
The old subwoofer remains connected.
the power cables of the amplifier are of a suitable diameter.
the negative is the same size as the positive, and is as short as possible.
fuses ok.
we tried to disable the active noise cancellation microphones with the obd2 stick.
The subwoofer gives this problem only behind closed doors.
when I accelerate the subwoofer emits a sound that simulates that of the motor.

Edited February 13, 2021 by FoxHound511