Patent ID: 7916890
Filing Date: 2011-03-29
Classification: H04R

Abstract:
1. An ultra low frequency transducer comprising: a basket having a polygonal front opening; a driver assembly supported by the basket 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 long reciprocating axial motion of the voice coil to produce ultra low frequency sounds; a diaphragm having a polygonal periphery shaped to conform to the front opening of the basket and being connected to the driver assembly for movement with the voice coil; and a flexible surround having a polygonal inner periphery connected to the front opening of the basket and a polygonal outer periphery connected to the periphery of the diaphragm, the surround comprising at least three straight side sections with a curved corner section between each pair of adjacent side sections, wherein at least two of the at least three side sections are of equal length; whereby the transducer is capable of effectively reproducing only about the lowest two octaves of music from about 20 Hz to about 80 Hz.