i put a sont xm-d400P5 amp in my friends car and he bumped for three days until he came back to me and all the amp did was blow fuses. We would disconnect the power, put in two new 30 amp fuses, and as soon and the power is put back onto the amp it blows the fuses. We hooked up his old kenwood and it plays fine again. Is it sony being sony..i have no idea