Feel every beat. The Mackie SR18S 18" Active Subwoofer adds depth and detail to your live sound system. With 1600W peak power on board you can explosive volumes without ever compromising on clarity. That means smooth articulate bass that everyone can enjoy. Built for maximum performance. The SR18S boasts deep responsive low-end all the way down to 33Hz. Thanks to a custom high-efficiency 18" woofer youve got maximum punch for every type of performance. Add to that three voicing presets and youve got perfectly tuned audio fit for any occasion. Take centre stage with confidence. The SR18S takes the hassle out of live sound so you can concentrate on what you do best. With stereo/mono summing variable crossover frequency and polarity invert controls on board flawless optimisation is a guarantee. All you have to do is plug in and play.