PB16-Ultra features a massive 16†Ultra driver with astonishing 8" edge wound voice coil, a stunningly powerful 1,500 watts continuous, 5,000+ watts peak power Sledge amplifier with fully discrete MOSFET output, triple 3.5" front-firing high-flow ports and an innovative subwoofer control and DSP smartphone app with custom presets for precise tuning. The ultimate ported box subwoofer.