Well, lets start saying that most of the sonosubs I have seen here are huge. I want to try to sneak something a little bit smaller into our living room. Lawyers have been contacted... ;-) So for a 60m2 irregularly shaped room, half of which is the actual sitting corner , I have settled on a vented Tempest sonosub design of 4" diameter x 48" height. Usage will be 70/30 music/movies. I have been playing around extensively with Unibox, WinISD and LspCAD after having read hundreds of threads and web pages. I would really appreciate some of the 'sub' humans looking into this design I am aiming at for the moment. - 4"x48" = 200L - driver,port,amp and plates gives me 175L available. - Tempest - DT300 plate amp - Minimal fill : Qa = 80 - Minimal leaks : Ql = 15 - Two flared port ends : Qp = 140 - Fb = 19Hz - F3 = 23,13Hz (I'm not able to get this down) - 4" port, 12.89" length - At 20Hz air speed reaches 25m/s, at 15Hz max at 33m/s I have allways understood that heavy stuffing is the thing to do when you have size constraints, but adding heavy filling (Qa=20)moves the F3 to somewhere around 33Hz. So what do you think? Am I missing something or is this reasonable? Or should I move to a Shiva? Or to a sealed sonotube maybe? Has anyone ever built this? Thanks for all comments!