I use some Entec L2f woofers with Rockport Syzygy speakers in a room not much smaller than yours, 16' x 24' x 8.5', but I would sure use two of them just outside the Hales....The presentation becomes about 20% larger than running the Rockports full range (they fall off the map in the mid thirties).....The Entecs will image in the bass as I can turn off the main amps and listen to bass image all over the place here.....They also have a 1hz notch filter wherein you can notch out the room modes, the nasty ones in the 70s and 80s.....Demian Martin hasn't built these in years, but I can put you in contact with him if you like as he might be able to find a pair for you.....
