I dont know if the coils dead shorted or not, but I have 4 gauge running frome the battery to amp, and from amp to frame, and its not got any extra batteries or HO alt. or anything cause i didnt figure i would need it since I know the amp isnt gonna produce anywhere near 3000W, and i know ur not slamming PA, hell i dont care i didnt really like it, i got it for hella cheap used and beaten, but i did notice that sometimes the subs would get quiter then hit hard again, but it looks like it burnt where the little black things (idk what they are), stretch from the board to the amp body, where they sit in the white lithium grease i think they are cooling things or something but 2 of them had alot of black stuff around them on the board and one of the hold downs for them was hella loose