The dublin tcx118b 18 band pass subwoofer from turbosound is a band pass subwoofer designed to complement tcx series midhigh cabinets in a wide range of installed and portable music sound reinforcement applications it consists of a double suspension 18 low frequency driver with an insideoutside wound coil in a low distortion dual port band pass enclosure and is designed for maximum sound pressure level and extended low frequency response the cabinet is constructed from 18 mm 34 birch plywo