Loudspeaker apparatus

• US 4,064,966 A
• Filed: 03/11/1976
• Issued: 12/27/1977
• Est. Priority Date: 03/11/1976
• Status: Expired due to Term

• Current Assignee: William D. Burton
• Original Assignee: William D. Burton
• Inventors: Burton, William D.
• Primary Examiner(s): Tomsky, Stephen J.
• Application Number:
  US05/666,006
• Time in Patent Office: 656 Days
• Field of Search: 181/144-156
• US Class Current: 181/144
• CPC Class Codes: H04R 1/227 using transducers reproducing the same frequency band
• CPC Class Codes: H04R 1/2842 for loudspeaker transducers

Abstract

A loudspeaker apparatus is disclosed herein having a sealed enclosure for housing a pair of multiple pairs of matched loudspeakers. The rear faces of the loudspeakers are effectively arranged so as to be directly exposed to each other via a tone chamber and operably coupled to be energized so as to move concurrently inward and outward. The respective pairs of loudspeakers having their effective radiation directed in the same direction along parallel longitudinal axis for radiating acoustical energy in a combined predetermined propagation pattern.

Claims

1. A loudspeaker apparatus comprising:

an enclosure having an internal sound chamber;

at least a pair of loudspeaker units secured in said sound chamber in fixed spaced apart relationship, each of said loudspeaker units facing in opposite directions in back-to-back relationship;

an air column carried in said enclosure having one end terminating adjacent the front of a selected one of said loudspeaker units and the other end terminating in close proximity to said other loudspeaker unit and having a length so that acoustic wave energy radiation from said other loudspeaker unit and from said air column is additive over a predetermined frequency range;

said air column is folded over upon itself so as to reverse the radiation direction of acoustic wave energy radiating from said selected loudspeaker unit;

a partition fixly carried in said enclosure having opposite wall surfaces defining a portion of said air column;

said partition associated with said selected loudspeaker unit for elongating and folding said air column so as to achieve said reverse direction of acoustic wave energy radiation;

said partition further includes a wall separating adjacent portions of said air column and a third portion of said air column extending at a right angle to said adjacent portions;

each of said loudspeaker units includes a vibrating cone and wherein said cones are electrically coupled in an out-of-phase relationship so that said cones move in unison.

2. In a sound amplification and projection

system having conventional vibrating cone loudspeakers, the combination comprising:

an enclosure having a sound chamber having a front wall, a rear wall and top and bottom walls joining the opposite ends of said front and rear walls in sealed relationship;

a first and a second of said loudspeakers carried by said front and rear walls respectively in back-to-back relationship so that acoustic wave energy radiates from said loudspeakers in opposite directions;

a confined air column carried by said enclosure for receiving acoustic wave energy radiated by said second loudspeaker and for re-directing said received acoustic wave energy into a propagation pattern parallel to and in the same direction as acoustic wave energy radiation from said first loudspeaker;

means coupling each of said loudspeakers in an electrical out-of-phase relationship so that air between said loudspeakers moves back and forth in unison in response to movement of said loudspeaker cones; and

said confined air column includes partition means for lengthening said column and for reversing the direction of acoustic wave energy radiation from said second loudspeaker.