Car Electrical Woes?

[Astyl 10+ year member]

So my current electrical system consists of Stock wiring, stock alternator ( 120A Stock ) and an optima redtop under the hood.. i have a 400 watt sony amp at the moment to push my two 12's , which im upgrading very soon for my birthday is less then a month away.. but the problem is if i play my system with my car off, in under 5 minutes, probobly three or so my low battery warning light comes on, etc... i put a DMM to the battery while the system is on, and within a 2 minute period my voltage went from 12.6 ish to 11.9, all in less then 2 minutes, and i have a optima redtop... is something wrong with this situation? With the car on the voltage hovers around 13.4-13.6 with no problems, but with the car off it shoots down in a very very short amount of time.. im wondering if my batterys not up to par? hell its only a 400 watt sony amp and only has 60 amps worth of fusing, yet it drains my electrical like no tomorrow, it drops a full volt in under 5 minutes

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[AJ²06 5,000+ posts]

How about trying to keep the car on when ur bangin? //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif