a few weeks ago i watched Master and Commander on DVD and afterwards checked my Blue Planet Watt meter.
the loudest parts were cannon shots, i believe.

the max Wattage was 605 Watts, but this includes the front and back speakers (amps) who also were contributing to the sound, and more importantly, my Hafler amp is not as efficient as the sub's amp or the QSC.

the loudest i've heard was the tripod coming out at the beginning of WOTW; at the time, i had set the sub's gain by ear on tv programs, which proved to be about 6 dB hot.

when the tripod put it's foot down, the sound coming out of the sub was so loud that after resisting the idea for a couple of minutes, i could not refrain from getting up and checking to see if there was a hole in the floor in the vicinity of the sub.
floor was ok, and the sub did not bottom, but i was shaken and had to take a breather.
it must have been near the max output.