i have 4 re audio sex 12s. im looking for one big 2 ohm amp or 2 1 ohm amps. the subs are dual 4 ohms. they are 600 watts rms. im looking for something really efficient on electrical. i have big three upgrade, 220 amp alternator and a knetick 2000. bout to get a xs power 6500. again im looking for some efficient any opinions cricisism or anything is appreciated