Natural rubber surround and handcoated paper cone with coated fabric dust cap, reduce resonances and distortion. A large magnet system and a symmetrical driving force accomplished through a special coil winding technique for the voice coil give an excellent linearity. A very large magnet system provides a reasonable effi ciency and a low Q. Extremely stiff and stable injection moulded metal basket keeps the critical components in perfect alignment. Large windows in the basket both above and