The StudioLive(TM) 18sAI is an active PA subwoofer system with an 18-inch ferrite low-frequency driver. Driven by 1,000 watts of Class D amplification, its Active Integration 32-bit, 96 kHz DSP gives these groundbreaking new subwoofers studio-monitor accuracy and delivers wireless and wired control of all setup, tuning, and monitoring functions, using free SL Room Control software for Mac®, Windows®, and iPad® (coming Spring 2014). Designed to complement the full-range StudioLive AI speakers while still being flexible enough to work with other powered loudspeakers, the StudioLive 18sAI has stereo line inputs (XLR/1/4-inch combo) and full-range, switchable stereo/summed-mono line outputs (XLR) with an adjustable alignment delay that allows the subwoofer to correctly combine with the full-range cabinets. Features include: · 18-inch transducer with 1,000-watt Class D amplifier · Active Integration 32-bit, 96 kHz DSP with variable crossover, dynamic limiting, and excursion limiting · Coming Spring 2014: Wireless networking with free SL Room Control software for Mac®, Windows®, and iPad® enables complete setup, tuning, and monitoring · Stereo line inputs (XLR- ft.î combo) and switchable stereo/summed-mono line outputs (XLR) with adustable alignment delay (0, 2, or 4 feet) · Integrated pole insert and interlocking stacking provisions