I need help with my car audio system!?

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First L

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What size alternator should i upgrade to if i am pushing two kicker ZX750.1 amps on two L712s. My alternator now is 115 amps and i am thinking about putting an extra battery on each amp, is that necessary?
I have a 1.5 farad cap now but i figured with the batteries it wouldnt need it, so yall are saying one extra battery and a bigger cap?
and yes i usually push it pretty hard, i have already melted a hiphonics 1200 watt amp, but that was me being stupid cause that was way to small for both speakers.
thanks for the chart, i already new about the cap but i was thinking that the extra battery would help with the power and not take too much away from my alternator
right now im thinking about running 0awg wire from my car battery to an extra in the trunk with a 300 amp fuse inline. Then 4 awg to each amp with caps but the caps kinda just for looks. figured they wouldnt hurt anything.
 
Here is a guide that will calculate what size alternator and power wires you need http://www.box.net/shared/uchv4dbk88

You will need Microsoft Excel. If you don't have Excel, use this link http://www.box.net/shared/nkkw1dhk4g
 
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