Patent ID: 8023688
Filing Date: 2011-09-20
Classification: H04R

Abstract:
1. A loud speaker comprising: an enclosure having a square diaphragm opening; a diaphragm having a square periphery shaped to conform to the square diaphragm opening of the enclosure; and a flexible surround between the periphery of the diaphragm and diaphragm opening in the enclosure; and a driver assembly supported in the enclosure and comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into reciprocating axial motion of the voice coil; wherein the diaphragm is configured to produce effectively only ultra low frequency sounds in the range of from about 20 Hz to about 80 Hz in response to signals in that frequency received by the voice coil.