I could also do (4)3" ports @ 32Hz.

Or (8)2" ports at 31Hz.

 

I'm wondering if maybe i should just go with 2 x 12" Q's in a sealed enclsoure?
I've never heard 12's in a sealed enclosure, would they move more air than my single 12BTL in ported?
Also, are they able to play low <30Hz.

 

Q 12 sealed box:

Enter Qts .37
Enter Vas 0.999405068 (ft3)
Enter Fs 34.2 Hertz
Enter Vb 1.5 (ft3)

Qtc = .4776
Fc = Hertz 44.15
F3 = Hertz 73.18

Sealed Subwoofer Speaker BOX DESIGN - Qtc Calculator

I don't think they'd be as loud as one ported 12 but below the tuning freq. they would be a lot louder, good for rap. 3.32 cf3 total/displacement .16. If a sealed box rolls off at 43hz and a ported box is tuned to 33hz than the ported box should be louder down to 23hz, right?

If you don't use a sealed box look at higher rms 12's and tune lower (gz audio). 2.5-3 cubes @ 30-35hz.

 

You seem to know more about this sort of thing than I do. =]
So it would not be advised to do two 12" Q's in sealed if I want more bottom end output?

 

The ported box would have the same roll-off until 23hz and would be +3db but there are also two Q's so it's (generally) +3db, they cancel eachother out, therefore the sealed box would be best just because it's tighter. The BTL has better efficiency by about 3db though. If you want hella lows that get loud enough get an LMS driver that rolls off at 30-35hz like an Eclipse SW8200 (670-1000w) or a Soundsplinter RL-S 12/15 (2000w). Both of them have 30-35hz tunings in optimal to +/- .5 cf3. Efficiency is lost but it makes up for it in the low end. Also the Audiopulse LMS-Ultra 15 on 5k would destroy things.

 

I like that SS RL-S, however it looks like it's only a single 4ohm voicecoil.

I have a Soundstream 1.2500D amplifier.
It only does 2500RMS @ 1ohm or, 1700 @ 2ohm.

So far, I really appreciate your help.
Maybe, my best possible option here is to upgrade the vehicle to something with a larger trunk opening. lol

 

Minimum & maximum space vs tuning:

Audiopulse Axis 12 2500w
.6cf3 = 47.37hz
1.4cf3 = 36.31hz

RE XXX 12 2000w
1.267cf3 = Q .707 / 36.75hz

Soundsplinter RL-S 12 - SPL 80.5db - 2000w
2cf3 = 37.78hz
2.5cf3 = 36.52hz - optimal
3cf3 = 35.66hz

SSA Xcon 12 1750w
.9cf3 = 49.91hz
1.5cf3 = 43.76hz

SSA Icon 12 1000w
1cf3 = 47.68hz
1.35cf3 = 43.77hz

Soundsplinter RL-P 12D4 1000W
1.35cf3 = 41hz

JL W7 1000w
1cf3 = 49.64hz
1.5cf3 = 43.46hz
2cf3 = 40hz

Image Dynamics IDMAX 12D4 1000w
1.5 cf3 = 44.15hz
Graph http://www.*********************/man...DMax12D4V3.pdf

Image Dynamics IDQ 12 500w
1.3725cf3 = 46.75hz (Q .707)
Graph http://www.*********************/man...20D4%20V.3.pdf

SSA Dcon 12 300w
.9cf3 = 58.67hz
1.2cf3 = 52.71hz

 

Can you cut the opening or double the power?

 

I was thinking about cutting the opening, but I've decided that I'll wait until I have a vehicle more suited for larger enclosures, and spend my time and money with that.

Thank you for taking the time in helping me, I very much appreciate it!

 

two 12"s off 2krms given the space you have would be best