Alesis S1 Active Subwoofer 250w powered 8" driver goes down to 40hz

Used very little. probably less than 40 hours. Sounds great. Works perfectly.

Designed for project studios, commercial recording studios and post production facilities requiring a reference source for low frequency monitoring, the S1 Active Subwoofer is the perfect solution for both music and audio post mixing. Featuring a proprietary front-firing driver and a powerful true 250 watt internal amplifier, the S1 Active offers low frequency extension for standard stereo mixing as well as excellent low frequency effect (LFE) channel reproduction for multichannel surround applications

• Driver: Custom-tooled 8" mica-impregnated polypropylene cone, large radius Santoprene surround, 40 ounce single piece ferrite magnet, 88.5dB sensitivity
• Frequency Response: Selectable 40Hz to 60Hz/80Hz/100Hz/ 120Hz, 2dB
• Signal To Noise: >117dB Low Pass Filter: 4th order Linkwitz-Riley switchable at 60Hz, 80Hz, 100Hz & 120Hz
• Filter Out Frequency Response: 40Hz-500Hz, 2dB Satellite
• High Pass Filter: Fixed, 80Hz @ 6dB/octave
• Amplifier: 250 watts RMS into 4 ohms
• Amp Distortion at 150 watts: 60Hz: 0.04%, 40Hz to 500Hz, 0.1%
• Input Impedance: 2 x 5K ohms unbalanced, low level in (1/4" jack); 2 x 15K ohms balanced, low level in (1/4" jack); 2 x 200K ohms high level in (speaker terminals)
• Controls and Indicators: Power on LED, clip LED, filter out control, level control, polarity flip control, power switch
• Connectors: 1/4" Line level inputs (2), 5-way binding post speaker level inputs (2), 1/4" Line level outputs (2), 5-way binding post speaker level outputs (2)
• Power: 100/200 or 115/230 VAC, factory set per region
• Weight: 36.5 lbs. (80.5kg)