The Vonyx SMWBA18 is a powered 18″ subwoofer designed to give your PA system the power and response it needs. Powered by a 500W built-in amplifier with an additional 2x 250W full-range outputs for powering 2x passive speakers. Perfect for anyone wanting a compact full-range PA system for small events and functions. The 18″ subwoofer is built into a study wooden enclosure with carpeted finish and provides excellent bass response. An integrated mixer lets you connect your microphones, and line level inputs with volume, treble/bass, and echo controls. Also included is a SUB frequency adjustment allowing you to tailor the cut-off to suit your speakers with range of 20-200Hz. Suitable for mobile DJs, small/medium bars, karaoke, parties, and more.