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Twin box, bi-amped active btwn bass and coax, passive Xover for the coax (hoping for a modified 1st order series). Quasi M&K style push-pull / aperiodic vented & eq'd, targeting ~ 80% Qtc .707 Vb (per my shrinking box experiment I took it down to 70%, so backing off that minimum size a bit). This nets a bass unit 10.25W x 17H x 12.5D. Top unit will be ~open backed 10.25W x 7.5H x 6.5D (plus grills). Initial goal is to run the coax full above 300, so 1st order HP ~145 to 150Hz (depending on what it can do dB-wise in my room).
Started making sawdust- got the bass box mostly cut (was getting tired, so thought best to leave the mistakes for another day…).