Dolby, it seems that louder automatically means better sound to you and nothing else.
You even named this thread “Small but loud…” You should study other aspects as well because they are important such as smoothness, distortion level and tonality just to name a few.
Those JBL theater subwoofers are made to produce down to around 30Hz but at high SPL. Some may extend down to 22Hz but at -10 db.
http://www.jblpro.com/pages/cinema/lfsub.htm You keep talking about chest pounding, you haven’t experienced subsonic performance of some of the subs including custom build type out there, have you.