Just splice in the positive and negative wires to the internal terminals on the block. Only do either the rear or the front speaker outs. Do not combine outputs.
yeah more than likely you have a white... white/black... grey... grey black... and either 2 black or 2 brown wires... the whites go to the left speaker... the greys go to the right speaker... black stripe means negative... and if the signal isn't strong enough ground the brown or black wires...