The JBL's PRX718XLF powered PA subwoofer produces precise and powerful bass. This powered speaker performs admirably as a single sub in a sub/sat system or in multiples in a scalable, large-format SR system. This sub's durable build allows it to withstand rigorous pro touring schedules. It's stackable and lightweight for rapid setups and teardowns. A JBL differential drive dual-voice-coil 18" woofer is powered by a 1500 Watt Class D amplifier, with powerful DSP providing crossover capabilities, polarity optimization, protection, dynamic limiting, and component optimization.