Free Express Shipping! Yamaha DXS18XLF 1600W 18" Powered Subwoofer (Black) For Live Stage, Theatre, DJ Setups, Designed for Low-Frequency Extension, Woofer: 18" with 4" Voice Coil, Max SPL: 136 dB, Frequency Range: 30 to 150 Hz (-10 dB), Class-D...