Purpose-engineered and built for real marine duty, the M-Series component speakers deliver maximum audio performance in any open-air boating environment. The M770-CCW component woofer is optimized to operate with a large volume of air behind it (at least 2 cu. ft. / 57 l). If you need a 7.7-inch component woofer that operates in a small sealed enclosure, select our M770-TCW, instead.