hi got my new mutant amp, using hi speaker connector, so got it connected all at front, expext for front speaker, back are in, but power is not, as it only comes with one connection to battey , need to put connector on other side, so need crimping tool, ground cable, doesnt fit on mutant, so thats need new connection, then i got power, but when connecting speaker to amp, it ask for normal neg and pos, but in the middle of the right and left it has a ground wire, why, the speakers already got a neg.