Loudest possible setup without adding battery/alternator?

So now we're working with...

Upgraded battery

160a stock alt

34.5 ft^3 cargo area (that's total, I want the box to be the same height as the top of the rear seat, not higher or lower. Yes, I want to keep my rear seats.)

More suggestions are welcome!

 
So now we're working with...
Upgraded battery

160a stock alt

34.5 ft^3 cargo area (that's total, I want the box to be the same height as the top of the rear seat, not higher or lower. Yes, I want to keep my rear seats.)

More suggestions are welcome!
u could do a 1200- 1500 watt amp on your stock electrical. i have a jbl1200.1 that i used on 1 15" and i had a diamond 400.4 for my comps all hooked up via 4 gauge wire in my 95 nissan maxima. a regular battery from advanced auto and a stock alt.........

 
I did a set up like that last year for a guy at work with short money. Stock Nissan pathfinder electrical with a crappy batt up front.

AQ 1200D pushing to 15" SDC's and it hits surprisingly hard and kills on the lows. Solid mid 140's on music would be my guess. Not an SPL killer, but for what he has it does quite well and beats up on all the local JL/Kicker set ups...

Box was 8.5cubes @ 38Hz and fit no problem. Really beats up his vehicle, but also sounds quite good when I can get him to play real music.

 
My first set up was a budget deal, Like most peoples. But the thing I learned from it was matching subs to power was real important. I walked into a stereo store and said what is the cheapest subs you have, They handed me two Powerbass PS 12's for 90 bucks. 250 rms 500 peak.I had them on a "850" watt Kenwood amp. in a slot port with long ports tuned to 40 I believe. It did 142.1 Term-lab in the trunk. Not bad for 200$ counting the amp. I already had the box and 4 gauge.

For low wattage, Light efficient subs are an option. Yes even cheap subs can work for good for you. Didn't sound half bad either. Plus that system was still pounding when I sold it a year later.

Edit: Stock electrical pretty much. 4 gauge and an old battery that came with the car. 96 Ford Contour. later I added a small Audioforce 220 battery. One of the little ones the size of a kinetic 600.

 
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