Ah, those poor folks who have to lug around their massive box subwoofers, they should have bought the Hsu TN-1220HO, which goes down to 20 Hz and weighs only 30 lbs. (The 500W amp is in a separate unit, and the cylindrical design apparently doesn't need as sturdy a frame as box.)

Thus cylindrical subs can be better for your health.

--Martin