Eh hem!...Subwoofers... What do ya know?

@erik_squires  placement in terms of nulls makes perfect sense.  I will read more into that

Whoever is interested in subwoofers for his audiphile setup shall strongly consider "The Swarm" subwoofer system from Audiokinesis (or some simmilar setup of 3-4 small subwoofers). I'm using this kind of system (4 subwoofers) with Soundlab electrostatic speakers and I enjoy it so much. Previously I've used a single REL subwoofer with Quad speakers but the marriage was not realy good. 

1) From what I read here, it seems like multiple in-wall subwoofers would be a good swarm solution...yes/no?

Yuck! The beauty of DBA is quantity matters more than quality. But, come on! A man's got to know his limitations.

2) Millercarbon: what subwoofers do you use for 16ohms?

Morel 10", which are a nominal 8 ohms each. With four subs and two amps you can get a total 4, 8 or 16 ohms simply by changing the way they are connected to the amp(s). 

I only have 1 powered sub. No DBA. I found that modeling my room, which is an “L” shape, and using it to model a horn, resulted in incredible bass, fast and tight. 

Pouring money into the problem is back-asswards.