As to how many hz you can actually hear from the subwoofer, I think the more important issue is the visceral feel you get from the sub. At the lower octaves you can feel the pressure more than hear it, if that makes any sense...
with regards to this point, i think the axiom subs produce sub 20hz frequencies (as do the SVS's for that matter), at around 50-60dB.
Is this a usable level or is it just a technical spec so that we can say "our subs do make subsonic levels". Also, what happens when i'm listening at say...80dB or so (or -13...whatever the hell that means haha) and the movie has a sound recorded at 10hz but the sub can only produce that sound at 50dB, does it just go haywire and not render it at all, or does it just render at at a lower level.
P.S. - That Junk Jiggle reference was PRICELESS.
