Thin loudspeaker construction complementing enhanced mid- and low frequency reproduction has a foam membrane with corrugated outer region and ring seal

摘要

The loudspeaker has a metal cap (11) containing the magnet (12) and coil suspension with plastic frame (14) connected to it. The membrane (15) comprises foamed polyurethane with corrugated outer region (16) and ring seal (17) fitting a recess of the outer frame.