Feedback/subs playing

[Tdh777]

First off, the setup is in an 03 Essie bauer expedition with the factory audiophile headunit with factory sub.

I am not a newb to car audio at all. Just new to this problem, I am adding a loc unfortunately as I know they ****, a Memphis 250.1 and two pioneer tens. I had this setup in a previous vehicle and it was hitting 130db. Now it is in the new truck and every time I shut a door the subs just progressively get louder until they max out. If I open the door it stops. The loc is connected to the passenger rear door speaker for the input. Anyone have a good idea as to what this is. I have electrical testing equipment avaliable. Any help would be greatly appreciated

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