The P300-12T ported powered subwoofer is an “all-in-one” solution when adding bass to a factory system or just to save space. This model features a 12” subwoofer in a sealed enclosure powered by an internal 300 watt amplifier. "Closed-loop" design ensures optimum performance between woofer, amplifier and enclosure. Built-in 0°/180° phase switch. Separate low level and speaker level inputs. Built-in adjustable bass boost EQ. Adjustable 12db/Octave low pass crossover. Detachable Power/Ground connector. Intelligent auto turn on/off function. Thermal and over voltage protection. High-efficiency, low current design. Remote bass level control included Proprietary high output woofer. Constructed with 5/8" MDF Large AWG input terminals. Covered with industrial heat activated vinyl.