"horns are hard to build"
you may pardon my noobishistic foolishness wrt to some of the advanced thinking that abounds in this thread but as a simpleton wrt to being able to follow instructions, after viewing many designs and possibilities for sub builds, the structural beauty and integrity/simplicity of the "lowarhorn" and the "submaximus" should make any semi-experienced builder (and a lazy man at that) recognize a good thing when he sees it.
especially when you have the data that shows the possibilities.
if you have the room for placement(options) and the patience and resources for the EQ and if you want to and can go BIG and get one heck of a sub "fix", with no regrets, a feeling of no compromises and "dero zefects" well...
just my .02
If you lived in OC, I'd help build one (MAX) just for the h3ll of it.
now from another thread, what about ? those rotary plans . . .
THE BIG ROOM: Mitsy DLP 73837 Xbox1 PS3 slim Panny BD 220
Denon X4000 and Emotiva UPA7 for 9.2
Klipsch F3 FL/R, G-28 C, RB 51's, FW's , RS3II SBL/R, RC3II, SL/R, SLX-FH's
2 30" BF THTLP'S and SubMaximus and Inuke6000DSP