The 5000 Series 10" Sub-Woofer is optimized for home theater and distributed audio systems, and includes a 10" poly cone in a sealed enclosure with a 150 RMS power amplifier. This amplified sub-woofer has choices of line and high level (speaker level) inputs and high-level outputs (post crossover). It also employs a variable crossover from 50 Hz to 200 Hz, phase reversal switch, volume control and power switch.