PSB makes several different subwoofer models from small desktop subs like the SSE100 to the incredibly powerful and refined SSE450 The S10 is in the sweet spot between where high value coexists with legendary PSB performance Employing a specially developed long throw 10 polypropylene woofer and powerful magnet assembly it is matched to a highly efficient 150W Power Amplifier and placed in a well-engineered enclosure that is carefully tuned for deep crisp bass response all the way down to an earth shaking 22Hz The S10 is a vented or ported design that takes advantage of the woofers back wave to extend bass response and power output