The CFX218-S subwoofer was developed as a companion to other CF and CFX series loudspeakers in high level entertainment applications needing the powerful sub bass punch and physical impact associated with 18-inch subwoofers. It is equally at home in fixed installations such as performance arts centers installations and in mobile applications where it will be moved on a regular basis. Its enclosure is ruggedly constructed from multi-ply hardwood to withstand the abuse it will receive in portable application and it is rigidly braced and lined with fiberglass to suppress resonances and rattles, and to assure low distortion high level performance. It is equipped with handles to assist in moving it around. Tripod sockets on one long side and on one end allow it to be used as a mounting base for associated full range loudspeakers, eliminating the need to carry tripod stands. Heavy duty 6-inch casters are available as an option for units that will be regularly moved from one location to another.