Aram, it is room loading that extends the bass response of the speakers. The only way to know the response in your own listening space is to get out the trusty Rat Shak SPL meter and measure it. In the case of my HT room, which is medium-sized and has a rather high ceiling, the 100s are down about 3db at 30Hz. With the sub engaged, the room is essentially flat to 25Hz and down 3db at 20Hz. That's gotta be enough bass for anybody!
will