Gonna drop the Alpine FR125S's to 200Hz too, so Extremis 80Hz-200Hz see if I can't get more from them without clipping. 120Hz bandwidth, these stupid 850.4s better start pulling some weight around here.
Extremis 850.4 80Hz 12dB Alpine 80Hz 30dB 42dB total, 200Hz 30dB top
FR125S 650.4 200Hz 12dB Alpine 200Hz 30dB 42 dB total play with the high transition to tweets
MORE POWER! lol Yes, squeezing the last drops. When the subs come on the HF suddenly doesn't seem so loud and wonderfuly unique... just simply trying to keep up.
Set everything back to 24dB, I don't understand the mathmatecal argument about even and odd distortion but it does seem to sound a touch better every time I put it back. The Extremis are up at 400Hz, so the FRs are 200Hz 12dB and 400Hz 24dB. The 850.4s seem to have a touch more headroom this way, but I do seem to have less midbass... sounds a bit hollow. The punches seem a bit more snappy and tight though.
So you want a nice mobile system? There is no need to spend $7500 to do that. It doesn't take much in the way of a subwoofer for starters.
This is what I'd do:
4 MFW-15's in a large sealed box (~13cu ft/driver) with about 100w per driver and a 15hz highpass. I'd imagine in a small space this could get you easily flat to 20hz at ~120db.
A 2-way with a Beyma TPL-150H ($500/ea and 102db sensitive from 1.2khz-20khz) in the kickpanel angled towards the center crossed to a sealed B&C 8NW51. This combo will have sensitivity in the range of 96db and should be capable of over 110db from 250hz-20khz. A 4-channel amp should suffice. Maybe a 4x25w amp. It doesn't need to be fancy and you probably won't use but 5w anyway.
For EQ, use 3 MiniDSPs. One for each 3-way and one for the subs.
Doing the math in my head with much rounding, this should be under $3k and will be capable of making you deaf across the entire audible frequency range without breaking a sweat or taxing your alternator. Still crazy, but should be pretty killer. You could do a similar setup in a home theater, bur I do a 2-way with a 12-15" woofer.
I guess I sort of passed this over, when really this is what I was asking for.
Beyma TPL-150H is 10"x10"x6" deep.. tough to get in the kicks but I suppose doable.
B&C 8NW51 Looks amazing. Much more area than the Extremis for starters.
Peerless 835028 10" XLS Shallow Subwoofer. So all this right here would highly outperform what I have now with less power?