MASSIVE POWER AND SUPERIOR BASS: The ZETHUS-118SPW powered subwoofer delivers rich and solid low-frequency reinforcement with its outstanding 800W continuous, 1600W peak power (8O) handling capability. Equipped with a built-in high-powered class-D amplifier, a top-quality 18' woofer with a 4' voice coil (145 oz. magnet), and featuring an aluminum frame, it ensures powerful bass and exceptional sound quality. STURDY CONSTRUCTION: Built to withstand the rigors of professional use, the ZETHUS-118SPW features a high-grade plywood construction and a heavy-duty perforated metal grille. This robust design and materials effectively dampens unwanted vibrations, while provides reliable protection during transportation.