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

[Galcobar]

I'd guess it's the exhaust hanger just before the resonator. If I'm right, the hanger's cracked, rattles against the body at certain RPM. Sounds like it's coming from behind your radio because the hanger's rattling against the body under the centre console.

Easy way to check: get the engine at the appropriate RPMs, throw on a thick glove, and grip the exhaust. If the noise stops, there's your issue. Maybe $20 to fix it, if the welding shop's got good guys they often won't bother charging you.

Side note: best to do this on a lift, but if you're doing it while parked on the ground do utilize the e-brake and chock the wheels. I'd also suggest neutral over being in drive. If this doesn't work (being in neutral changes how the engine vibrates, try shaking the exhaust. It shouldn't make any noise as it's suspended using rubber doughnuts.