High-performance 500-Watt powered subwoofer for PA applications. Powerful 12' long-excursion transducer with high temperature voice coil provides incredibly accurate and pulse-pounding bass Built-in active stereo crossover provides high-pass filtered outputs for full-range loudspeakers. Tunable and switchable Bass Boost plus Phase switch for ultimate low-frequency performance. Subwoofer Level control to adjust the balance between subwoofer and the full-range speakers.