Dome or cone midrange

I would use the SB34NRX75-6 for subwoofer and the SB Satori MW19P-8 or the Scanspeak 18W/8434G00 as midbass. Not the TAD, even if it's a very nice driver. It's just don't fit the rest of the setup.

If you use the TAD, surely use a dsp to cross it with a lower sensitive setup, otherwise it won't work well and may cause fire if you try to tame that TAD with resistors to the level of the rest. And i would cross the TAD as a subwoofer (below 100Hz) to make up for the missmatch in directivity. Below that frequency, directivity is omnidirectional anyway (except with cardioid subs, but you won't do that) so the mismatch does not matter at all, above it matters a lot. Bot the Satori and the Scanspeak easely go below 100Hz, so that is not the problem.
 
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