RED: Silicone the box? i hope you mean first use wood glue and maybe silicone the edges to make sure it's 100% airtight?
And you don't need to do that much screws, they only hold the wood together till the glue dries, screws don't really hold the box together.
1 screw per 6 inches should be good enough.
BLue: You really don't think the PA amp will do 2300W RMS or close to it?
It does less then 2000w at 1 ohm.
I should atleast recommend a hifinics amp or a other maxxsonics brand amp, because you're budget is quite low.
As a subwoofer i would use a Sundown SA 15 or a Fi SSD 15 (it does costs a bit more but it's a better woofer.)
Or a DC Lvl 3 although i don't know how much they cost.
I don't want to offend u but if u're systems were something close to SQ you should know a lot more.(You probably meant it didn't needed to sound loud but just sound decent. )
Lol, the guy that said that u needed to remove the top plate doesn't know a lot about woofers...
Because it's glued down and the magnets hold it down, it's almost impossible to remove it without destroying it.
I thought he had 3 amps. don't know where i got it from.
But as you already know they don't do 6.5kw at 14V.
And with box rise it will be close to 15kw-16kw. (with all 4 amps)
Like Boon just said, 2 250amp alt and 5 batts but i suggested 2 300amp alt and 2-3 batts it would be cheaper i think and more then enough power.
The impedance graph is totally different.
On the previous box u had more boxx rise then this one, so more power and more current draw=more voltage drop.
:facepalm:
Sundown subs are good, fi subs are good, dc subs are good, ascendant audio subs are good, t3 audio,digital designs subs are good.
Make a choice of what fits in you're price range.
Edit: i can hear it.