P900.4 best configuration?

Hey guys.

I've got this precious mobile soundsystem


The setup is as follows:
amp: Precision Power Phantom P900.4 LINK
drivers: 4 x10" Precision Power PM-104 LINK
tweeters: 2 xPrecision Power PT.2 Bullet Tweeters LINK

All this is hooked up to a 12v AGM battery 80Ah
The drivers are mounted in each 18 liters cabinets, airtight!
They are wired parallel - 2ohms per driver.

I've been wondering how to setup the amp correctly for loudest and lowest power consumption, and of course it is ok if it sounds good too..

To illustrate my lack of understanding this amp, here's a paintsketch


I hope you guys will help me out.

That looks great, I hoping you're going to tell us that the top section lights up.