Yamaha CXS18XLF 2000W Passive Subwoofer (Black) - 18inPerfectly suited for use with CZR full range speakers, the Yamaha CXS18XLF is a bass reflex type subwoofer with extended low frequencies, outstanding clarity, and best in class 133dB SPL performance. This bass reflex subwoofer boasts 2,000 watt power handling, a 29Hz 150Hz frequency range, and can tackle any application you throw at it. A great sounding, custom designed transducer delivers rafter shaking low end. The CXS18XLF can take full advantage