The Mackie SRM1801 powered subwoofer effortlessly delivers 1000 watts of room-shaking Class-D power in a lightweight, portable design. The 18" woofer delivers superior output. Its active electronics include a precision crossover and tuning filters which provide amazingly accurate bass response. The robust, solid-wood speaker enclosure is covered with high-durability, textured black paint, and includes an integrated pole cup that's a perfect fit for your Mackie SRM450v2. Ideal for small clubs, DJs, or any portable sound reinforcement application, the Mackie SRM1801 subwoofer completes a lightweight, easy-to-use Mackie powered system.