Professional 500-Watt powered subwoofer for PA applications. It features powerful 18'' long-excursion transducer with high temperature voice coil, precise reproduction of ultra-low frequencies, 500-Watt Class-D amplifier with comprehensive over-excursion, thermal and clip limit protection, built-in active stereo crossover, tunable and switchable Bass Boost plus Phase switch and variable High Cut control for perfect sound alignment. It offers subwoofer Level control, Power, Signal and Clip LEDs for perfect monitoring, intelligent limiter for maximum sound performance and woofer protection and internal switch-mode power supply for noise-free audio, superior transient response and very low power consumption. Subwoofer is equipped by pole socket for mounting with commercial spacer poles, ergonomically shaped handles and rugged steel grill for optimal speaker protection.