So, after reading the full 20 pages on this thread I can't extract any clear conclusion....
I have half a mind on a DIY sub disguised as a back table close to my main couch, so a driver like that STW would be the perfect match: small box profile, get ultra low frequency... But so much haters in these thread move away my initial excitement about this driver. It's actually that bad?
I must say that subwoofer/table project would complement a pair of SB16 Ultras placed on the front wall (with the main front speakers), so I want to get some extra "Slam and Oomph" on the very low bass on films (SB16 Ultras more oriented with stereo music only).
So don't you recommend that Tymphany STW-350? Would be better a simple Dayton UM18? Box size should be about 7ft3 and I'd like keep the SB16 low distortion/clean bass.