I owned Mahlers for six years, have owned other large speakers and have heard a lot of large speakers - "slam" is the Mahler's forte. In each speaker, you have two 10" woofers, two ports, and two 7" mid/bass drivers. The 7" mid/bass drivers are the same 7" driver used in the WattPuppy and Maxx II's, they are normally used as bass drivers, and are, due to first-order crossovers, down only 6 db. at 35 Hz. (and that's just the mid/bass drivers). Largely as a result of the foregoing, the speakers are tipped up in the midbass and move a lot of air -- they'll pin you up against a wall.