"Did you model WMTMW like Paul W. did?"
the floor bounce calculation was for just one driver.
"All 3 use the SEOS-18 with the BA-750 for now."
with a 12" midrange, it would seem the 12 or 15 inch seos would have better directivity matching, but having pattern control to a lower point has advantage too.
"If a 15" model is used, Bill thought this one looked good:
the 15fw76 is quite similar in performance and price, but includes demodulating ring.
"I generally don't like the tone..."
no worries. he was just pointing out a potential stupid idea. its always good to call out stupid ideas!
"Would anyone ever max out a 12" midrange"
that's probably sufficient for total overkill. my concern is actually whether or not the 21" will be able to keep up, even with a couple thousand watts of power. considering that it starts with both lower sensitivity and the spectral content of music can be 10db or more higher in the bass than the midrange.
yeah. that's the one being considered here.
"I did think about using the internal walls of the 12" enclosure as sides for the subwoofer ports..."
just keep in mind that might cause some diffraction problems.