NOT ENOUGH?!?!? In what way? ULF Tactile response, midbass slam (I can actually believe that one in a small room), or just can't reach Ref?
WTF will be enough, 'fear for your structure' SPL? 'Fear for your life' SPL? Nearfield pistol/rifle/shotgun/artillery blasts triggered by a threshold on the soundtrack?
Having been 100 meters away from a 155mm Howitzer I didn't know was going to send some hurt downrange (without hearing protection), I can tell you that 'fear for your f'ing life' SPL starts at around 140dB if it is not anticipated. Do you really need that, and the innumerable 'what, can you repeat thats' you will ask servers in crowded restaurants for the rest of your life?
Maybe he just needs a Crowson transducer surgically implanted into his diaphragm, although his answer will be interesting.
Due to the wide bandwidth and high sensitivity of the drivers I'm using for the subs and MBMs I'm building, I'll probably have > ~140 dB capability between 60-200 Hz or so, and I'll have > 130 dB capability from 20-1000 Hz probably. I *might* be able to reproduce that Howitzer cannon, but I guess it depends on its spectrum. That kind of capability scares me, like what happens if I have an equipment malfunction? My DSP runs on a computer and is essentially running at 100% volume all the time. What if I encounter a software bug, or a neutrino flips the wrong bit in memory and causes it to output white noise to all channels?
I remember when a Bose Acoustimass module with two 5.25" drivers put a big grin on my face. Later I thought a 12" Velodyne was just insane...then a 15"...then a 18"...then two 18s...etc...etc...etc.
Wow, does Bose offer its Acousticmass modules with bigger drivers? I have a hard time believing a pair of 5.25" drivers can do much of anything.
My first audio system other than a tape recorder was hand-me-down from my mom of an old Marantz stereo receiver and a pair of Bose Interaudio 4000, ported with 10" woofers. The bass they offered, while a bit one-noteish, was very satisfying compared to most other speakers I'd heard and even some subs. The weak point was the 3" paper cone mid/tweeter, which seemed to overload and distort badly before the woofers ever complained. I remember thinking "The Matrix" sounded really cool on them, and I lived with and enjoyed them for over 15 years in all. I never thought of them as being that great (and they weren't), but they still sounded better than the vast majority of stuff in other peoples' homes.