What I've got in mind is something like a main array of TC9 and then the B4N side firing or angled front firing, but taking on the load from around 300Hz down.
More like the FAST idea of just helping out on the bottom end. It does mean larger towers though, and vented will probably give best low end extension. Possible to do passively, but I think I'd do it as a two way active setup, allowing phase correction and room optimised crossover finest performance...
How many do you plan on using? ~ 3 mm x-max, still need a lot of them compared to a bigger size woofer array.
I'd place 25 of them as closely as possible to one side of the TC9s, and the vent(s) on the other side. Although, I'd use the Visaton KT 100v instead of the HiVi.
Goedemorgen!
What do you think about the Visaton KT 100v? Visatonshop | KT 100 V 4 OHM | Lautsprecher und mehr
What do you think about the Visaton KT 100v? Visatonshop | KT 100 V 4 OHM | Lautsprecher und mehr
Goedemorgen 
It isn't quite efficient (at 80 dB 1W/1M), and I doubt it has much x-max, about +/- 2 mm? It's cheap though. KT 100 V - 4 Ohm - Visaton Diskussionsforum
It isn't quite efficient (at 80 dB 1W/1M), and I doubt it has much x-max, about +/- 2 mm? It's cheap though. KT 100 V - 4 Ohm - Visaton Diskussionsforum
Goedemorgen
It isn't quite efficient (at 80 dB 1W/1M), and I doubt it has much x-max, about +/- 2 mm? It's cheap though. KT 100 V - 4 Ohm - Visaton Diskussionsforum
Well, take 25 of them in a line, and efficiency and x-max seem relative. Or am I on the wrong path? I wouldn't want to use them in a R'n'R PA, though
Has anyone tried these yet?
https://www.digikey.com/products/en?keywords=Tymphany NE123W-08
I can't believe Digikey sells them!
https://www.digikey.com/products/en?keywords=Tymphany NE123W-08
I can't believe Digikey sells them!
Well, take 25 of them in a line, and efficiency and x-max seem relative. Or am I on the wrong path? I wouldn't want to use them in a R'n'R PA, though
x-max on the TC9 is 2.55 mm. Sure it has smaller Sd area, but whatever I'd choose has to top out the TC by at least 2x. More headroom
.The Visaton:
54,1 x 25 x 2 = 2705 (volume displacement)
Compared to a single Scan Speak 30W type of driver (or a Peerless XXLS):
466 x 12.5 = 5825 (volume displacement)
An array of TC9's:
36 x 25 x 2.55 = 2295 (volume displacement)
See what I mean?
Wow 14.2mm Xmax on a 4" fullrange driver. That's pretty extreme!
http://www.tymphany.com/wp-content/themes/pathfinders/cache/pdfs/NE123W-08.pdf
http://www.tymphany.com/wp-content/themes/pathfinders/cache/pdfs/NE123W-08.pdf
I did notice that, and it's price...
Yeah much cheaper from Digikey than anywhere else.
Watch out because other datasheets for NE123W-08 suggest Xmax is 3,1mm
That would seem much more realistic when we look at that surround.
The only high x-max (small) full ranger I know is the Audience A3:
