Magnetic fluid loudspeaker assembly with ported enclosure

Details Magnetic fluid loudspeaker assembly with ported enclosure Magnetic fluid loudspeaker assembly with ported enclosure

1996-09-23

1998-05-26

Kuntz, Curtis

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

381192, 381194, H04R 2500

Patent

active

057579466

ABSTRACT:
A miniature loudspeaker assembly comprises a loudspeaker drive unit housed in an enclosure. The drive unit comprises a magnet unit defining a magnetic air gap, a voice coil in the air gap, and a diaphragm coupled to and driven by the voice coil. Magnetic fluid is injected into the air gap to occupy interstices between the voice coil and the poles of the magnet unit. The enclosure has a volume between about one eighth and about double a compliance equivalent volume of the loudspeaker drive unit. Preferably, the enclosure volume is less than or equal to the compliance equivalent volume of the drive unit. The enclosure may have a port. The free space resonant frequency of the ported enclosure may be between about 50 percent and about 60 percent of the free space resonance frequency of the loudspeaker drive unit.

REFERENCES:
patent: 4017694 (1977-04-01), King
patent: 5335287 (1994-08-01), Athanas

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