Perfectly suited for use with CZR full-range speakers, the CXS18XLF is a bass-reflex type subwoofer with extended low frequencies, outstanding clarity, and best-in-class 133dB SPL performance. The lightweight yet durable plywood cabinet can be fitted with an optional wheel kit (SPW-1) for true portability. Perfect for professional touring musicians, DJs, and sound engineers who need that extra-low, thundering bottom end. Durable white finish.