high end subwoofer...which one tho?

I own two F-15 subwoofers from Rythmik Audio with clear, articulate, fast and not flabby results. They're audiophile subwoofers that do extremely well in both two-channel audio listening and home theatre applications. I spent several months researching subwoofers over the Spring and Summer, so I know what you're going through. The questions seem endless...

1. Driver size?
2. Room volume?
3. Ported vs. non-ported vs. TL
4. Amp power... what is too much or too little?
5. Cost considerations... best bang for buck.
6. Build quality and reputation?
7. Audiophile or Godzilla foundation smashers?

I chose Rythmik Audio after talked to representatives from all the usual suspects. I'm very pleased with the F-15's.

Im running a Fathom 112 (single) and love it, but..... I auditioned several others and for HT use IMO most of the high end units will work beautifully. I chose mine based on 2 channel use (I thought it was better controlled, other opinions may vary. For HT use I'd be happy with anything mentioned on this thread. if your house and budget can take it the new paradigm 25 looks pretty dangerous!

Rel Studio

Velodyne DD18

JL Audio f113

.
...forget about the Velodyne DD-18 as someone suggested here. It is waaay to much overkill for a room your size.
.