Loud speaker system

• US 3,983,333 A
• Filed: 04/07/1975
• Issued: 09/28/1976
• Est. Priority Date: 03/01/1974
• Status: Expired due to Term

• Current Assignee: Allison Acoustics Incorporated
• Original Assignee: Allison Acoustics Incorporated
• Inventors: Allison, Roy F.
• Primary Examiner(s): Olms, Douglas W.
• Application Number:
  US05/565,875
• Time in Patent Office: 540 Days
• Field of Search: 179/1 E, 181/144, 181/148, 181/155, 181/198, 181/147, 181/156
• US Class Current: 381/89
• CPC Class Codes: H04R 1/26 Spatial arrangements of separate transducers responsive to two or more frequency ranges
• CPC Class Codes: H04R 1/323 for loudspeakers H04R1/34 and H04R1/40 take precedence

Abstract

A room audio speaker system for use in combination with at least one room boundary surface, the speaker comprising an enclosure having a closed end wall for placement closely adjacent the room boundary surface and a second wall extending away from the end wall and providing a front edge and a rear edge, the latter forming a boundary with the end wall. Direct radiator audio reproducer means are provided generally flush mounted generally parallel to a portion of the exposed surface of the second wall. The included angle between the end wall and that second wall portion is no more than about 90°. The distance along the second wall from the center of the reproducer means to the rear boundary edge is not more than one-half the smallest outside dimension of the second wall and the closed end wall is free from any audio reproducer means.

Claims

1. A room audio speaker system for use in combination with first and second boundary surfaces, said system comprising at least one cone loudspeaker having a frequency range extending at least as low as 100 Hz, and an enclosure including a closed end wall for placement closely adjacent said first boundary surface and a mounting panel on which said cone loudspeaker is mounted extending away from said end wall and forming an angle of not more than 90°

with said end wall, said system being characterized in that;

said mounting panel provides a rear edge forming a boundary with said end wall, a side edge disposed for placement closely adjacent said second boundary surface when said end wall is closely adjacent said first boundary surface, and a front edge;

said mounting panel has a predetermined minimum dimension in a direction parallel to the outer surface of said mounting panel defining a predetermined frequency above which said panel reduces the effective radiation angle of said cone loudspeaker;

the distance along said mounting panel from the center of said cone to each of said side edge and said rear edge is not more than one-half said predetermined minimum dimension whereby when a said side or rear edge is adjacent a said boundary surface the effective radiation angle of said cone loudspeaker at frequencies below said predetermined frequency is reduced;

at least one of said boundary surfaces is a room boundary surface;

said system includes a second said cone loudspeaker; and

the distance along said enclosure between the centers of said cone loudspeakers is not greater than said predetermined minimum dimension.

2. The system as claimed in claim 1 wherein said cone loudspeakers are driven in phase.

3. A room audio speaker system for use in combination with first and second boundary surfaces, said system comprising at least one cone loudspeaker having a frequency range extending at least as low as 100 Hz, and an enclosure including a closed end wall for placement closely adjacent said first boundary surface and a mounting panel on which said cone loudspeaker is mounted extending away from said end wall and forming an angle of not more than 90°

with said end wall, said system being characterized in that;

said mounting panel provides a rear edge forming a boundary with said end wall, a side edge disposed for placement closely adjacent said second boundary surface when said end wall is closely adjacent said first boundary surface, and a front edge;

said mounting panel has a predetermined minimum dimension in a direction parallel to the outer surface of said mounting panel defining a predetermined frequency above which said panel reduces the effective radiation angle of said cone loudspeaker;

the distance along said mounting panel from the center of said cone to each of said side edge and said rear edge is not more than one-half said predetermined minimum dimension whereby when a said side or rear edge is adjacent a said boundary surface the effective radiation angle of said cone loudspeaker at frequencies below said predetermined frequency is reduced;

said system is for use in combination also with a third boundary surface and at least two of said boundary surfaces are room boundary surfaces;

said cone loudspeaker is the only loudspeaker of said system having a frequency range extending at least as low as 100 Hz;

said mounting panel has a second side edge disposed for placement closely adjacent said third boundary surface; and

,

the distance along said mounting panel from the center of said cone loudspeaker to said second side edge is not more than one-half said predetermined minimum dimension of said mounting panel.

4. A room audio speaker system for use in combination with first and second boundary surfaces, said system comprising at least one cone loudspeaker having a frequency range extending at least as low as 100 Hz, and an enclosure including a closed end wall for placement closely adjacent said first boundary surface and a mounting panel on which said cone loudspeaker is mounted extending away from said end wall and forming an angle of not more than 90°

with said end wall, said system being characterized in that;

said mounting panel provides a rear edge forming a boundary with said end wall, a side edge disposed for placement closely adjacent said second boundary surface when said end wall is closely adjacent said first boundary surface, and a front edge;

said mounting panel has a predetermined minimum dimension in a direction parallel to the outer surface of said mounting panel defining a predetermined frequency above which said panel reduces the effective radiation angle of said cone loudspeaker;

the distance along said mounting panel from the center of said cone to each of said side edge and said rear edge is not more than one-half said predetermined minimum dimension whereby when a said side or rear edge is adjacent a said boundary surface the effective radiation angle of said cone loudspeaker at frequencies below said predetermined frequency is reduced;

at least one of said boundary surfaces is a room boundary surface; and

said loudspeaker has an upper cutoff frequency not higher than the frequency for which the center of said loudspeaker is one-quarter wavelength from one of said end wall and said side edge.

5. The audio room system of claim 4 further characterized in that said cone loudspeaker is the only audio reproducer means mounted on said mounting panel, and in that said enclosure includes a second mounting panel generally perpendicular to said first mentioned mounting panel and audio reproducer means having a frequency range extending above the frequency range of said cone loudspeaker mounted on said second mounting panel.

6. The audio room system of claim 4 further characterized in that audio reproducer means having a frequency range extending above the frequency range of said cone loudspeaker is mounted on said mounting panel.

7. a room audio speaker system for use in combination with at least one room boundary surface comprising:

an enclosure having

a closed end wall free from any audio reproducer means and adapted for placement closely adjacent said room boundary surface,

a pair of side walls, each of said pair extending away from said end wall at an angle with respect to said end wall of no more than 90° and

providing a front edge, side edges, and a rear edge,

said rear edge of each of said pair forming a boundary with said end wall, and

said front edges of said pair being closely adjacent and connected to each other whereby said end wall and said side walls define a triangle in cross-section; and

,

direct radiator audio reproducer means mounted on each of said pair of walls midway between said front edge and said rear edge of said each of said pair of walls for projecting sound outwardly therefrom.

8. A room audio speaker system as claimed in claim 7 wherein said audio reproducer means are driven in phase.

9. A room audio speaker system as claimed in claim 7 wherein one side edge of each of said pair of side walls is disposed for placement closely adjacent a second boundary surface.

10. The audio room system of claim 9 wherein the distance from the center of each of said audio reproducer means to the said one side edge of the side wall on which said each reproducer means is mounted is not more than one-half the distance from the rear edge to the front edge of said side wall on which said each reproducer means is mounted.

11. The audio room system of claim 9 wherein each of said audio means is a cone loudspeaker, the distance along each of said pair of walls from the front edge thereof to the rear edge thereof is a predetermined distance defining a predetermined frequency above which said each of said pair of walls reduces the effective radiation of the said cone loudspeaker means mounted thereon, and the distance from the center of the said cone loudspeaker mounted thereon to each of the said rear edge and the said one side edge is not more than one-half said predetermined distance.

12. The audio room system of claim 11 wherein each of said cone loudspeaker has a cutoff frequency not greater than the frequency from which one-half said predetermined distance is one-quarter wavelength.

13. The audio room system of claim 7 wherein the distance from said rear edge to said front edge of one of said side walls is equal to the distance from said rear edge to said front edge of the other of said side walls, and wherein each of said side walls forms an angle of less than 90°

with said end wall and with the other of said side walls.

14. The audio room system of claim 13 wherein the distance from said rear edge thereof to said front edge thereof of each of said side walls is a predetermined distance above which said each of said pair of walls reduces the effective radiation of the said audio reproducer means mounted thereon, one side edge of each of said side walls is disposed for placement closely adjacent a second boundary surface, and the distance from each of said audio reproducer means to the said one side edge of the side wall on which said audio reproducer means is mounted is not more than one-half said predetermined distance.