Krack499

iTrader: (1)

When the radio turns on I get a weird deep crackling noise that I believe is coming from the sub then when I shut off the truck and open the door theres a noise that's almost like a low piano key it's not every time but most times anyone know what is causing it I'm pretty sure it's coming from the sub

connorfx4

Factory or aftermarket sub?

Krack499

iTrader: (1)

I'm assuming factory

johnny_tucson

That happens a lot when amplifiers are about to go/going bad. I don't know why but that has been my experience. It could also simply be an issue with your ground and/or positive power wires at the amp or wherever the wiring harness takes it to the other end.

Krack499

iTrader: (1)

Ok so where's the amp is it in the box

connorfx4

I had a noise like that before from my subwoofer. It was caused by a loose rca cable coming out of the amplifier.

johnny_tucson

It should be mounted on the outside of the factory subwoofer enclosure. You might have to remove a bolt to get at it. If it's not the factory enclosure I would suggest checking all connections at the amplifier AND behind the stereo. If you notice that it is not factory a common place to mount an aftermarket amp in our trucks is behind the back seat or under the front seats.