Originally Posted by TheEAR
TC-3000 an SPL driver....
Watch out it is also a SQ driver in the proper hands and...setup.
Sorry, the TC3k has too much inductance to have any role in a serious music system. Might be fine to boom around with, for rattling your bones on synthetic explosions. But that nasty and amusical old 3HP motor, even updated with shorting rings, is just not for serious music listening.
Some drivers not mentioned on this thread that are worth considering are the JBL W15GTi, McCauley 6174, and (barely mentioned) the 15" and 18" Aura NRT-based drivers.
In that volume, for music listening with smallish mains and if I had to pick one driver, I'd probably go with the W15GTi because it's cheaper than the Auras, though the new Creative XBL^2 driver might get the nod just because it's something I haven't yet played with.
But what I'm actually doing for a similar preferences (sub designed to mate with superior mains, with high-fidelity reproduction of live acoustic music as the primary consideration by far, only difference being it is a system designed for multichannel music) is using three Peerless XLS12's with their matching PR
's in ~105L of cabinet volume. The cabinet I've commissioned (six sided, with the woofers firing 60deg from each other to balance the internal forces) would exceed your height criteria, so if you must do a rectangular box I'd consider upping the volume to 4.5 cubic feet and running four of them instead of threee. Multiple motors mean less excursion at typical listening levels for greater linearity and subjective dynamic "ease."