The aspect of loudspeaker systems until the 1950s was poor. Continuous developments in enclosure draft and materials have led to significant audible improvements. The most notable improvements in modern speakers are improvements in cone materials, the introduction of higher temperature adhesives, improved permanent magnet materials, improved Wireless Outdoor Speakers measurement techniques, data processor aided constitution and finite element analysis.
The basket or frame must be designed for rigidity to avoid deformation, which will about-face the magnetic conditions in the magnet gap, and could even cause the inflection coil to rub against the walls of the magnetic gap. Baskets are en masse cast or stamped metal, although molded plastic baskets are becoming common, especially for inexpensive drivers. The frame also plays a considerable role in conducting heat away from the coil.
