ok so i have a avic-x710bt and i was getting bad static output from my rca. when i had my front output and subwoofer outputs plugged it my subwoofer would go nuts bass hard on volume 0 with the car just on ACC not even started . so i sent it into pioneer under warranty and they replaced the internals completely. so i get it back from pioneer and still the same problem idk what the hell is going on and this is with the engine off and the car in acc. i have a alpine cda105 in my dash right now and everything is 100% my wiring is perfect.

My amp went nuts at first too but it turned out that i had not plugged the connector all the way in. Maybe try AV Sound settings>Sub woofer> Phase and select "reverse"?

Is the amp making a buzzing noise? or is making noises every so often.

It also happens to the front and rear outputs. It sounds like really bad alternator whine but the car isn't started