i have a 02 a4 1.8t. non bose. i lost power to my rear speakers the other day. so i went looking around the car, i lifted up the rear seats on the right side.. it was all burnt and melted.. this little black box under there had fried itself. is it a power relay or an amp? but regardless of what it is.. i need to replace it. where can i find one?

 

so no one has a clue?? i can't find this part anywhere.. it runs the rear speakers. i dont have a part number because the damn thing melted itself.