im buying 2 kicker comp c12 8ohm in a sealed box and a Sony XM-SD22X from a friend he has one sub mounted normally and another mounted backwords is this the best way to do it? if not which is? and should they be wired in parallel or in series because the amp runs 500 watts RMS x 1 bridged output at 4 ohms (4-ohm stable in bridged mode)