The BOSE's MB24WR low-frequency loudspeakers are meant to supplement Bose LT arrays and other subwoofer applications with additional bass. This passive speaker comes in black and is weather resistant. Dual 12" high-excursion woofers with 4" voice-coils and a discrete power handling of 800W RMS are featured in the Baltic birch enclosure (3200W peak). The subwoofer has a frequency response of 40 to 280 Hz and a front-loaded transmission line design that reduces port turbulence distortion by providing a peak-free extended low-frequency.