Active 1200-Watt 18" Subwoofer. The frequency range and crossovers of the Truesonic TSSUB18 and TSSUB15 have been tuned to provide smooth, low-end sound production in the 37Hz-125Hz range (42Hz-125Hz for the TSSUB15). They also offer stereo inputs, an internal active crossover, and are housed in rugged, compact, 18mm Birch plywood cabinets with durable metal recessed handles. When you're ready to extend the frequency range of your live performance reinforcement, Truesonic subwoofers are the effective, economical, and professional choice. Exacting details were planned and provided in the Truesonic TSSUB18 and TSSUB15. From the modern digital power amp to the internal crossover and handpicked drivers, they are class-leading subwoofers and worthy of the Truesonic name. As active subwoofer systems, The Truesonic TSSUB18 and TSSUB15 offer a massive 18" LF long-excursion driver and large 15" LF long-excursion driver respectively. They're rated at a whopping 1200 watts and feature a 3" copper sandwich voice coil, which means you'll have plenty of low-end volume when you need it most.