ground speaker with amp

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.
 
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jc1234
i did , just shows digrams, no mention of the black cable, but spoke to halfords there didnt have a clue, so i gues it there for extra, he also told me not to crimp a connector on the power cable to amp as if you not good at, it can be very crap, suggest just shove on metal plate and tighten it. could of finshed it today if dhd came to my house quickder, but gonna get back speakers working, and if all fine , start re routing front to amp.
 
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