In reply to:

it can still pull over 115 dB at 20 Hz in (small) room with corner placement.

117 dB at 20 Hz at listening position about 3.5 feet away to be exact. I didn't max out my sub all the way, but I didn't want to push it any harder because I don't want to accidentally break it just to see its limits; but it was using a lot of excursion.