Got four of the OB15 woofers that I’m thinking of building two IB manifolds for with two drivers in each as two subs for music in a home studio.
Modeling seems to indicate that with 250W per woofer, each would hit Xmax 18mm at 30Hz @ 111db and Xmech at 20Hz @ 107 dB. With a 1st order BW HP filter @ 20 Hz excursion stays below Xmax (peaking @ 24 Hz). Max SPL is 115dB and F3 @ 32 Hz and F6 @ 23 Hz. With a bit of room gain and moderate EQ, this sounds like it could work out pretty nicely for music, no…?