You get a Pair of the PB16-Ultra which is the most powerful and sophisticated ported box subwoofer SVS has ever developed and touts all new driver, amplifier and control platforms along with several radical innovations designed to establish the PB16-Ultra as the ultimate reference standard for bass. Massive all new 16" ultra driver with unprecedented 8" edge wound voice coil ensures astonishing output and low frequency extension with pinpoint accuracy and speed in transients. Stunningly powerful, new Sledge 1500-D Amplifier with fully discrete MOSFET Output and 1,500 Watts Continuous, 5,000+ Watts Peak Power delivers effortless and intelligent power with nary a trace of distortion.