Yea....with 6 of those I could do 150+dB @ 25Hz. Ewwwwwww! That would be soooo EVIL!
I already do 150+ at 25hz 
2 DMX 15's--Reconed
4 P1500.1's
Dodge Ram 1500 club cab
plays over 150db from 24hz-40hz still high 140's to 18 hz...
MECA style with T/L mic at headrest--Louder at the dash 
Hmmm.yea...but I'm not talking burps, I'm speaking of bass bxing and bass race.......playing music and doing an average over 30 seconds. I can currently play at 151.6dB on music @ 40Hz. I can burp 156.7dB @ 51Hz.
That's with 6 DMX15's and 3 P3000.1 amps backed up by 6 BATCAP3000mbatts and a 250amp alt by EXCESSIVE AMPERAGE in a Grand Caravan.
If you can truly do 150dB @ 25Hz, I would love to hear it. Not many can clain what you do. I'm steady working on it though.