600 W of Power. Tuned Frequency Range – 47Hz – 125Hz. Plenty of Low End Volume. Rugged Birch Plywood Cabinet. Alto Truesonic TS-Sub 12 600W Active Subwoofer Overview. The Alto Truesonic SUB12 comes equipped with 600 W of power and a tuned frequency range to provide smooth, low-end production in the 47Hz-125Hz range. The subwoofer also offers stereo inputs, an internal active crossover and a rugged 18mm Birch plywood cabinet with durable metal recessed handles. Truesonic subwoofers are an effective, economical, and professional choice to extend the frequency range of your live performance reinforcement.