Weired Noise comming from the area behind the radio, Please help Options

[phantom]

I have this weird noise coming from the area behind the radio. It’s a constant, biiiiiiiiin, noise that only happens when I’m driving at RPM range of 2000 and 2300. When I let go of the accelerator to drive a lower range it goes away, if I drive higher than 2300 RPM I have no noise.
Could this be an ECU related issue?

I took my radio our and all the other parts. I thought that this would happen because of the vibration of the car while driving that two pieces of plastic or metal were rubbing with each other, the car vibrates more when I don’t have it on. But it being at a specific RPM range while I’m driving, I have no idea where this is coming from.

Your help is really appreciated. Thanks in advanced

[DGAF]

YOU ALSO MAY WANT TO CHECK YOUR IDLER PULLEY AND MOTOR MOUNTS. SOMETIMES THE ENGINE SITS ON BARE METAL AN THE HUMMING SOUND OF A BAD IDLER PULLEY MAY SOUND A LITTLE CONFUSING. EVEN THE AC COMPRESOR MAY BE RUBBING AGAINST THE AC CLUTCH.

GOOD LUCK MAN...