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The Dayton RSS265HE is also a great option when it comes to T/S for small enclosures but the Seas has proven linear excursion. You could also fit two of the notch larger Daytons (RSS315HO-4) in 40 liters with a Q of 0.6 . The SB has a great track record but the excursion is pretty nonlinear...
The mk II Dayton Reference looks very good on paper - larger voice coils and high excursion, with inductance kept in check. I’ve never used them. They’re 20% off today, with a good return policy if they don’t work out, so may be worth serious consideration.
That said, FWIW I tried the previous Ref 265 (Velodyne SC10 cabinets) in my old desktop system, and ended up going back to the OG Peerless XLS10s (Triad Bronze “in wall” subwoofers pushed against the wall under my desk) they were supposed to replace. I don’t think there should have been any difference but for whatever reason (I don’t remember why now) I just liked the old ones better and went back to them.
Also one more word about modeling. When I model a closed box today, I only look at one thing: can it reach theoretical full excursion with the power I plan to use in that box. That’s a crude measure to be sure, but gets you in the ballpark of being able to make use of all your power and all your excursion.
???As the board insists on having a downfire (sagging) config.
Times the solution doesn't come from in the obvious ;-) Cost of no concern? Go for BMS neo drivers or JBL's XBL^2 p/a woofers.
BMS makes high performance drivers that are also beautiful (the back end of the 8N519 is a work of art - makes me want to try them as midbasses in OB) but are hard to source in the US. I also don’t know if they have a long throw 10 or 12. Those are midbass sizes in BMS’s market. Maybe you know of one?
I don’t think JBL made a 10” or 12” PA sub (could be wrong) but differential drive (not XBL - JBL never used that) woofers are quite deep. The old car audio JBL W10GTi it (basically their pro audio differential drive platform with a heavy cone and rubber surround) might have been a good fit, but they’re long out of production. If one’s hunting unicorns then Aurasound NS10-794-4a or NS12-794-4- would be the ones to get anyway.