i recently purchased 2 15" incriminator lethal injections which say they only take 600 watts rms......just wondering if this is true or not because im lookin to upgrade to a bigger amp but dont want to overpower them, i currently have a hifonics 1600 watt brutus ran at 1 ohm to them with all stock electrical. whats the best amp for me? considering the sundown saz-1500d which is supposed to put out around 1900 at 14 volts thanks oh and also what battery should i put in the rear??