The Mackie SR18S powered subwoofer offers premium sound for working musicians, DJs, and venues alike. Its 1600-watt Class D amplifier packs reliable, consistent performance in a lightweight package, and its custom high-efficiency transducer ensures top-notch sound. A dedicated processing module guards against system overloads with the utmost in transparency. This state-of-the-art powered sub includes application-specific Custom Voicing presets for simplified setup; the SR18S also includes a variable crossover, easy system optimization features, versatile output options, and an integrated pole cup for your main speaker.