Waterproof passive subwoofer, 12", 800W The bandpass design of the enclosure maximizes the output volume. With a 4" "voice coil," it ensures minimal losses. The TTL12-S WP features an integrated mounting system compatible with the TTL31 WP array module. Connection to the amplifier is made through a waterproof connector. The grille is made of specially perforated aluminum, and the enclosure is constructed from Baltic birch treated with a waterproof coating.