US3385929A

US3385929A - Support for a high fidelity stereophonic system

Info

Publication number: US3385929A
Application number: US384607A
Authority: US
Inventors: Magyar John; Spencer Richard Houghton
Original assignee: CLAIRTONE SOUND CORP Ltd
Current assignee: CLAIRTONE SOUND CORP Ltd
Priority date: 1964-07-23
Filing date: 1964-07-23
Publication date: 1968-05-28
Anticipated expiration: 1985-05-28
Also published as: GB1069539A

Description

J.MAGYAR ET AL.

SUPPORT FOR A HIGH FIDELITY STEREOPHONIC SYSTEM I Filed July 2:, 1964 May 28, 1968 v 3 sheets-sheet 1 INVENTORS J 01/ "#6)?! lP/MMD flaw/WW M 644% orumvnq May 28, 1968 J. MAGYAR ET AL 3,385,929

SUPPORT FOR A HIGH FIDELITY STEREOPHONIC SYSTEM 3 Sheets-Sheet 2 Filed July 23, 1964 f A J! I mum FIO.9.

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May 28, 1968 J. MAGYAR ET AL 3,385,929

. SUPPORT FOR A HIGH FIDELIT; STEREOPHONIC SYSTEM Filed July 23 1964 I 3 Sheets-Sheet o United States Patent 3,385,929 SUPPORT FOR A HIGH FIDELITY STEREOPHONIC SYSTEM John Magyar and Richard Houghton Spencer, Toronto,

Ontario, Canada, assignors to Clairtone Sound Corporation Limited, Rexdale, Ontario, Canada Filed July 23, 1964, Ser. No. 384,607 11 Claims. (Cl. 179-1) ABSTRACT OF THE DISCLOSURE A high fidelity stereophonic system including a turntable, a pair of speakers and a common support for these components including a column which supports the turntable and also an elongated boom, the speakers being mounted, in practice, on opposite ends of this boom such that vibrations from the speakers are effectively dissipated during travel along the boom to prevent feedback to the turntable unit.

The present invention relates generally to an improved high fidelity stereophonic system, the improvements broadly being concerned with a common support physically integrating the various components of said system, and more specifically with selective regulation of the directional sound radiation of the system to promote an optimum stereophonic effect.

The usual basic components of a high fidelity stereophonic system include a turntable and associated turntable components and a pair of loudspeakers, said components in a usual custom installation being separately housed in individual enclosures which only in rare instances are physically integrated on a common support. By spacially isolating the system components, and more particularly, the low frequency sound loudspeaker from the turntable, the problem of vibration feedback therebetween is obviated. However, but for the vibration feedback problem it unquestionably would be more commercially preferable to have the system components integrated on a common support.

Accordingly, it is broadly an object of the present invention to provide a common support for the individual enclosures of the component parts of a high fidelity stereophonic system which achieves physical integration of said system and which also maintains a spacial relationship between said enclosures to a degree which is effective to prevent the transmission of vibration therebetween which adversely affects sound reproduction of the system.

More specifically, it is an object to provide a common support for said various component enclosures which, on the one hand, permits a relatively compact spacial arrangement of said enclosures, and on the other hand offers a sufficiently long path through which vibration can be transmitted therebetween to substantially dissipate much of the system vibration.

The present invention is moreover concerned with closely matching the acoustical characteristics of the listening environment to the known characteristics of the recording environment to correspondingly promote a closer match between the reproduced sound and the original sound. Thus, for example, a musical piece recorded in a cathedral and under usual conditions therein where the performers are hidden and the audience hears only reflected sound waves, is recognized according to the present invention as requiring playback in the listening environment in a manner which duplicates this total indirect transmission of the sound to the listener. Similarly, a musical piece recorded in other environments, as for example in a nightclub, might require playback which transmits the reproduced sound both directly and indirectly to the listener to more closely match the sound "Ice transmission of the original recording and listening environments.

Thus, it is a further object of the present invention to provide in a common support for a high fidelity stereophonic system means for mounting the loudspeaker and enclosure assemblies thereon which permits selective adjustment in the directional sound radiation of said loudspeakers to achieve any desired degree of direct and indirect sound transmission.

A common support according to the present invention includes an upstanding hollow column having opposite vertical slots in its upper end accommodating the medial portion of a laterally extending boom. A mounting plate accommodating a turntable enclosure is provided with a cylindrical collar which is slidably disposed in the upper end opening of the column and seats against the boom to secure the same against movement under the weight of the turntable. The loudspeaker enclosures are mounted on the remote ends of the boom in spaced relation from and on opposite sides of the turntable enclosure supported on the column. More particularly, the arrangement of said enclosures on the boom is, on the one hand, compact in that the enclosures at their closest point are not far removed from each other, while on the other hand, the path through which vibration can be transmitted therebetween as determined by the points of connection of said enclosures to said boom is sufliciently long to substantially dissipate much of the vibration of the loudspeakers of the system.

Additionally included within the scope of the present invention are several embodiments of rotatable mountings for the loudspeaker enclosures which permit selective adjustment in the directional sound radiation of the loudspeakers of the system to regulate, as desired, the manner in which the reproduced sound is transmitted to the listener, that is whether directly or indirectly by reflection from surfaces of the listening environment.

The above brief description, as well as further objects, features and advantages of the present invention will be more fully appreciated by reference to the following detailed description of presently preferred, but nonetheless illustrative embodiments in accordance with the present invention, when taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a front elevational view of an assembly of a high fidelity stereophonic system and a common support therefor embodying features of the present invention;

FIG. 2 is a side elevational view of the assembly of FIG. 1;

FIG. 3 is a plan view of the assembly of FIG. 1, as seen from a vantage point beneath the assembly;

FIG. 4 is a partial side sectional view, taken along lines 4-4 of FIG. 1, illustrating on an enlarged scale the mounting of the boom and turntable enclosure support plate on an upstanding column of the support;

FIG. 5 is a partial front sectional view, taken along lines 55 of FIG. 4, further illustrating the mounting connection shown in FIG. 4, and additionally the manner in which the electrical wiring is disposed through such connection;

FIG. 6 is an exploded view of FIG. 4 more clearly illustrating the order of assembly of the parts making such connection;

FIG. 7 is an exploded view of FIG. 5, with the electrical wiring removed, and particularly illustrating notches on the boom for seating the same on the column;

FIG. 8 is a detailed isolated view, on an enlarged scale, of a loudspeaker and enclosure assembly with portions of the enclosure broken away to illustrate one embodiment of a loudspeaker mounting;

FIG. 9 is a still further enlarged detailed view of the assembly of FIG. 8, with portions thereof in section to illustrate one embodiment of a rotatable boom mounting for said loudspeaker and enclosure assembly;

FIG. 10 is a view similar to FIG. 8 but of another embodiment of a loudspeaker mounting;

FIG. 11 is a plan view, in reduced scale, projected from FIG. 10 as seen from a vantage point beneath the assembly of FIG. 10;

FIG. 12 is an elevational sectional view, taken along lines 1212 of FIG. 11, of another embodiment of a rotatable boom mounting for a loudspeaker and enclosure assembly; and

FIG. 13 is a plan sectional view, taken on lines 1313 of FIG. 12, illustrating the cooperating stop pins of such rotatable mounting which limits rotation of said mounting to one 360 degree traverse.

Shown in FIG. 1 is a preferred embodiment of a common support, generally designated 10, for the

several component enclosures

12, 14 of a high fidelity stereophonic system. The relatively large generally rectangular enclosure 12 will be understood in practice to house not only the turntable of the system, but also the amplifier and other such component parts of the system, but for simplicitys sake will herein be considered as principally an enclosure for the turntable (not shown) of the system. The generally spherical enclosures 14 each house a loudspeaker of the system. As shown in FIG. 1, the

enclosures

12, 14 are relatively compactly arranged on the support 10, each of the loudspeaker enclosures 14 being spaced at their closest point only a comparatively small distance D from the opposite ends of the turntable enclosure 12. However, while achieving this desirable compact spacial arrangement, it will be noted that the path through which vibration of a loudspeaker could be transmitted to the turntable of the system, taking for example the left hand loudspeaker enclosure 14 relative to the turntable enclosure 12, is determined by the respective points of contact A and B of these enclosures with the common support 10 and thus is several times the distance D. Accordingly, the common support 10 of the present invention which permits, on the one hand, such a compact spacial arrangement of the

enclosures

12, 14 while, on the other hand, maintaining a comparatively long vibration path between said enclosures represents an optimum solution to obviating vibrational feedback between the component parts of the system consistent with an economy of space.

As shown in FIG. 1, the common support 10 includes a hollow cylindrical column 16 supported in a vertical upright position on a wide leg base 18 suitably connected to the base of the column. As is best shown in FIGS. 4-7, the upper end 20 of the column is provided with opposite vertical slots 22 for accommodating an elongated horizontally disposed boom 24 (see FIGS. 1, 2) and also cylindrical extending collar 26 Welded to the underside of a mounting plate 28 for the turntable enclosure 12. In order of assembly, the medial portion 30 of the boom 24 is first slidably disposed in the slots 22 such that spaced notches 32 provided on the underside of said boom engage the bottom surfaces 34 of the said slots for generally seating the boom 24 within the column 10. Following this, the mounting plate collar 26 is slidably disposed in the end opening 36 of the column 10 and seats against the upper surface 38 of the boom, this sliding connection between the collar 26 and column 10 being secured against rotation by the engagement of the upper end of each slot 22 with spaced blocks 40 welded to the outer periphery of the collar 26. To further prevent rotation of the collar 26 within the column 10 and also to interconnect the collar 26 and boom 24, the length provided the collar is such as to project the lower collar end 42 beyond the upper boom surface 38 and such projecting collar end is provided with seating slots 44 engaging this surface portion of the boom. Moreover, not only is it provided that the collar 26 seat against the boom 24 as just described, but also that the supported weight of the turntable and other components (not shown) which in practice are housed in the enclosure 12 and mounted on the plate 28 bear against the boom 24 to securely hold this support member in its mounted position on the upright column 10. This is achieved by providing the upper portion 46 of the mounting plate collar 28 from the seating slots 44 to the connection of the mounting plate 28 thereon with sufiicient length to clear the upper end of the column 10 when said collar is telescoped in said column, such clearance being exaggerated in FIG. 4 and designated C. Due to the Weight of the enclosure 12 bearing against and firmly holding the boom 24 at its medial portion 30 in position within the column 10, there is no problem in providing sufficient length to the boom 24 so that the overhang of this member on either side of the column 10 is adequate to project the opposite ends 48 of said boom sufiiciently beyond the ends of the enclosure 12 to accommodate the loudspeaker enclosures 14 thereon. Moreover, since the enclosure 12 as best shown in FIG. 1 is mounted with considerable overhang on the mounting plate 28, a pair of spaced brackets 50 are bolted on the underside of said enclosure, as shown in FIG. 3, and are seated on the boom overhang to stabilize the mounted position of the enclosure 12 on the support 10.

Returning to FIG. 5, it will be seen that the loudspeaker electrical wiring 52 is directed from the components housed in the enclosure 12 (not shown in FIG. 5) through aligned openings 54 and 56 in the mounting plate and

boom

28, 24 respectively, to a channel 58 machined in the underside of the boom 24, and as best shown in FIG. 3, is then directed to each of the loudspeaker enclosures 14 for connection to said loudspeakers as is hereinafter described.

In accordance with the present invention, the loudspeaker enclosures 14 are each mounted on a boom end 48, the mounting connection therebetween being such as to permit rotation of said enclosures 14 for selective adjustment of the directional sound radiation of the system for the purpose of matching the sound transmission in the listening environment to the known sound transmission of the original recording environment. Thus, where it is known that the musical piece is recorded in for example a cathedral and under usual conditions where the performers are hidden and the audience hears only reflected sound waves, the loudspeaker enclosures 14 are correspondingly orientated in their rotatable mountings to transmit the sound by reflection from surfaces within the listening environment to duplicate this total indirect transmission of the sound to the listener.

One preferred embodiment of a rotatable mounting for each of the loudspeaker enclosures is shown in FIGS. 8 and 9 and generally designated 60. Mounting 60 includes a spindle 62 provided with a machined slot 64 which slidably receives the boom end 48. After being thusly fitted on the boom end 48, the spindle 62 is physically joined to said boom by a bolt 66 which is conveniently extended from the underside of and through the body of the boom in the working clearance C of the channel 58 into the body portion of said spindle 62 which extends inwardly of the end of the boom 24. Disposed in a vertical central through bore 68 provided in the body of the spindle 62 is a hollow threaded stud 70 which interconnects the loudspeaker enclosure 14 and the spindle 62 and also serves as a vertical axis of rotation for the mounting 60.

As is best shown in FIG. 9, seated in an upper end counterbore 72 of the through bore 68 and about the stud 70 is a stationary plastic bearing block 74 which presents a conical seating surface 76 to a similarly shaped conical surface 78 of a rotatable bearing member 80 also disposed about the stud 70 and in practice seated in said bearing block. By providing the bearing

members

74, 80 with confronting conical bearing surfaces 76, 78,

and by additionally subjecting said members to the urgency of a spring 82 disposed about the lower end of the stud 70, the rotatable bearing member is automatically centered in the bearing block 74.

An additional function of the spring 82 is to hold the rotated position provided the rotatable bearing 80 resulting from selective adjustment of the orientation of the loudspeaker enclosure 14 during regulation of the directional sound radiation of the system. Thus, as best shown in FIG. 9, the lower end of the spindle central through bore 68 is provided with a counterbore 84 accommodating the stud encircling spring '82, and such spring is adapted to be compressed between spring seating washers 86 'by appropriate tightening up of the opposite end nuts 88 threadably engaged on opposite ends of the stud 70 to correspondingly urge the bearing surfaces 76, 78 into a surface contact which holds the rotated position of the bearing member 80. Also as best shown in FIG. 9, the electrical wiring retained by clips 90 along the boom channel 58 is conveniently introduced into each of the loudspeaker enclosures 14 through the central bore 92 of the stud 70.

Having particular reference now to the construction of each of the loudspeaker enclosures 14, such enclosure as best illustrated in FIGS. 8 and 9 includes outer and

inner support discs

94, 95 and a bottom shell half 96 interposed on the stud 70 between the bearing member 80 and the washer 98 and upper end stud nut 88. Thus, the two

support discs

94, 95 and the bottom shell half 96 are urged by the spring 82 against the rotatable bearing member 80 and accordingly rotate with said member. To further insure rotation in unison of the enclosure 14 with the bearing member 80, the enclosure parts 94-96 are physically connected to the bearing 80 by the bolt 100.

Referring now particularly to FIG. 8, cemented at an angle within the bottom shell half 96 is a mounting ring 102 accommodating a conical speaker 'bafile 104 connected by circumferentially spaced screws 106 to said ring 102 on a cushioning interposed gasket 108. A loudspeaker 110 is angularly mounted as by bolts 112 in the opening 114 of said conical speaker baffle 104 and in accordance with well known speaker operation vibrates to produce sound in response to electrical impulses transmitted through the electrical wiring connected as at 116 to said speaker. Cemented or otherwise secured inwardly and about the opening 118 of the bottom shell half 96 is a connecting ring 120 which receives a perforated top shell half 122 to complete the construction of the spherical loudspeaker enclosure 14.

Another embodiment of a mounting for rotatably supporting a spherical speaker enclosure 14 is illustrated in FIGS. 10-13, the parts of such embodiment which are identical in function to parts of the rotatable mounting 60 just described being designated with the same but primed reference numerals. Essentially mounting 60 differs from mounting 60 in that provision is made for limiting rotation of the bearing member 80' to one 360 degree traverse in order to prevent undue twisting of the electrical wiring 52 disposed through the hollow stud 70' of the mounting. Accordingly, in mounting 60 use is made of a bearing ring 74' having a relatively large central opening 124 for seating the bearing member 80 well within the spindle 62. Provided on the lower face 126 of the bearing member 80' is a stop pin 128 which extends into a circular groove 130 machined in the bottom surface 132 of the spindle counterbore 72' and which during rotation of the bearing member 80 engages a movement limiting stop pin 134 anchored in said circular groove 130 as is clearly shown in FIGS. 12 and 13. In all other major respects, however, mounting 60' is similar to previously described mounting 60.

Having reference to FIG. 10, the loudspeaker 110 is shown angularly mounted in another embodiment of a spherical loudspeaker enclosure 14'. This embodiment includes a bottom shell half 96' having a radial wall 196 mounting a particular lip 138 which in the assembly of the enclosure 14 accommodates the conical speaker baffle 104 in a sliding force fit. More particularly, the end of the speaker baffie 104' fitted on the bottom shell half 96 is provided with

contiguous walls

140 and 142 of varying diameters, the larger diameter wall 140 being the one force fit on the circular lip 138 of the bottom shell half 96. Additionally, plural perforated top shell halves 144 and 146 are employed in this speaker enclosure embodiment, the perforations of which when mounted on the bottom shell half 96 are out of alignment with each other to make the interior of the enclosure 14 less accessible to the passage of dirt particles and to outside probing.

In order of assembly, the wall 140 of the speaker bafile 104 is force fit first about the lip extension 138 of the bottom shell half 96 and the perforated inner top shell half 146 disposed over said baffie in a force fit with the battle wall 140. The construction of the spherical enclosure 14 is then completed by disposing the perforated outer top shell half 144 in a force fit over the bafile wall 142. Incorporated in the construction of the loudspeaker enclosure 14 to promote richer acoustical characteristics in the reproduced sound is a relatively hard acoustical material 148 lining the inner surface of said enclosure and backed with a lining of softer acoustical material 150.

From the foregoing description it will be appreciated that the common support 10 of the present invention represents an optimum solution to the vibration feed back problem usually encountered in the operation of a high fidelity stereophonic system in that the various enclosures 12, 14 (and 14') for the component parts of said system are mounted in a relatively compact spacial arrangement on said support, while the comparatively longer path through which vibration can be transmitted between said enclosures is maintained at a length which for all practical purposes results in substantial dampening out of said vibration. Additionally, the loudspeaker enclosures 14, 14' are supported on said common support 10 on

rotatable mountings

60, 60 which permit selective adjustment of the directional sound radiation of the system.

A latitude of modification, change and substitution is intended in the foregoing disclosure and in some instances some features of the invention will be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the spirit and scope of the invention herein.

What is claimed is:

1. A common support for a high fidelity stereophonic system including a turntable enclosure and a pair of loudspeaker enclosures, said support comprising an upstanding column, a laterally extending boom mounted at its medial portion on the upper end of said column, turntable enclosure mounting means slidably disposed on the upper end of said column against said boom to secure said boom against lateral movement under the weight of the turntable of said system, and means on said boom for rotatably mounting each of said loudspeaker enclosures to permit selective adjustment in the directional sound radiation of the loudspeakers of said system, said means being located on the opposite ends of said boom to isolate said loudspeakers from the turntable of the system to prevent the transmission of vibration therebetween.

2. A common support for a high fidelity stereophonic system including a turntable enclosure and a pair of loudspeaker enclosures, said support comprising a hollow upstanding column having opposite vertical slots in its upper end, a laterally extending boom mounted at its medial portion in said vertical slots, means mounting said turntable enclosure on the upper end of said column including a cylindrical collar slidably dis-posed in the end opening of said column and seating against said boom for securing the same against lateral movement under the weight of the turntable of said system, and means on said boom for rotatably mounting each of said loudspeaker enclosures to permit selective adjustment in the direction- :11 sound radiation of the loudspeakers of said system, said means being located on the opposite ends of said boom to isolate said loudspeakers from the turntable of the system to prevent the transmission of vibration therebetween.

3. A common support for a high fidelity stereophonic system including a turnable enclosure and a pair of loudspeaker enclosures, said support comprising a hollow upstanding column having opposite vertical slots in its upper end, a laterally extending boom mounted at its medial portion in said vertical slots and having spaced notches therein adapted to engage with the bottom edges of said slots for seating said boom on said column, turntable enclosure mounting means slidably disposed on the upper end of said column against said boom to secure said boom against lateral movement under the weight of the turntable of said system, and means on said boom for rot-atably mounting each of said loud-speaker enclosures to permit selective adjustment in the directional sound radiation of the loudspeakers of said system, said means being located on the opposite ends of said boom to isolate said loudspeakers from the turntable of the system to prevent the transmission of vibration therebetween.

4. A common support for a high fidelity stereophonic system including a turntable enclosure and a pair of loudspeaker enclosures, said support comprising a hollow upstanding column having opposite vertical slots in its upper end, a laterally extending boom mounted at its medial portion in said vertical slots and having spaced notches therein adapted to engage with the bottom edges of said slots for seating said boom on said column, means mounting said turntable enclosure on the upper end of said column including a cylindrical collar slidably disposed in the end opening of said column and seating against said boom for securing the same against lateral movement under the weight of the turntable of said sys tem, and means on said boom for rotatably mounting each of said loudspeaker enclosures to permit selective adjustment in the directional sound radiation of the loudspeakers of said system, said means being located on the opposite ends of said boom to isolate said loudspeakers from the turntable of the system to prevent the transmission of vibration therebetween.

5. A common support for a high fidelity stereophonic system including a turntable enclosure and a pair of loudspeaker enclosures, said support comprising an upstanding column, a laterally extending boom mounted at its medial portion on the upper end of said column, turntable enclosure mounting means slidably disposed on the upper end of said column against said boom to secure said boom against lateral movement under the weight of the turntable of said system, and a mounting for each loudspeaker enclosure carried by said boom including a bearing block fixedly mounted on said boom, a rotatable bearing seated on said bearing block and operatively connected to each loudspeaker enclosure to permit selective adjustment in the directional sound radiation of the loudspeakers of said system, and a threaded stud disposed vertically of said bearing block and bearing and having end bolts threadably engaged thereon for maintaining said bearing in seated engagement with said bearing block while permitting rotation thereof about the vertical axis of said stud, each of said loudspeaker mountings being located at each of the opposite ends of said boom to isolate said loudspeakers from the turntable of the system to prevent the transmission of vibration therebetween.

6. A common support for a high fidelity stereophonic system including a turntable enclosure and a pair of loudspeaker enclosures, said support comprising a hollow upstanding column having opposite vertical slots in its upper end, a laterally extending boom mounted at its medial portion in said vertical slots and having spaced notches therein adapted to engage with the bottom edges of said slots for seating said boom on said column, means mounting said turntable enclosure on the upper end of said column including a cylindrical collar slidably disposed in the end opening of said column and seating against said boom for securing the same against lateral movement under the weight of the turntable of said system, and a mounting for each loudspeaker enclosure carried by said boom including a bearing block fixedly mounted on said boom, a rotatable bearing seated on said bearing block and operatively connected to each loudspeaker enclosure to permit selective adjustment in the directional sound radiation of the loudspeakers of said system, and a threaded stud disposed vertically of said bearing block and bearing and having end bolts threadably engaged thereon for maintaining said bearing in seated engagement with said bearing block While permitting rotation thereof about the vertical axis of said stud, each of said loudspeaker mountings being located at each of the opposite ends of said boom to isolate said loudspeakers from the turntable of the system to prevent the transmission of vibration therebetween.

7. A common support for a high fidelity stereophonic system including a turntable enclosure and a pair of loudspeaker enclosures, said support comprising an upstanding column, a laterally extending boom mounted at its medial portion on the upper end of said column, turntable enclosure mounting means slidably disposed on the upper end of said column against said boom to secure said boom against lateral movement under the weight of the turntable of said system, a mounting for each of said loudspeaker enclosures carried on each of the opposite ends of said boom including a spindle having a vertical through bore, a bearing block having a central opening disposed in an end counterbore of said spindle through bore, a rotatable bearing seated on said bearing block and having stop means on its seating surface extending through the central opening of said bearing block and adapted to engage with cooperating stop means on said spindle for limiting rotation of said bearing while seated on said bearing block to approximately one 360 degree traverse, and a hollow threaded stud disposed vertically of said bearing and bearing block within said spindle through bore and having end nuts thereon for maintaining said bearing in seated engagement on said bearing block, means connecting each loudspeaker enclosure to each bearing to permit selective adjustment in the directional sound radiation of the loudspeakers of said system, and at least two electrical wires connected between said turntable and loudspeaker enclosures including means mounting said electrical wires along the underside of said boom, the medial portion of said boom and said means mounting said turntable enclosure having aligned openings therein for threading one end of both said wires into said turntable enclosure and the other end of each said wire being threaded through each hollow stud into each loudspeaker enclosure.

8. A high fidelity stereophonic system comprising a support including an upstanding column having an upper end, a turntable enclosure disposed symmetrically of said support and mounted on the upper end of said column, first and second loudspeaker mounting arms extending longitudinally in opposite direction beneath said turntable enclosure and terminating in first and second mounting ends equally spaced beyond the opposite ends of said turntable enclosure, a first loudspeaker enclosure journalled on said first mounting end of said first mounting arm for rotation about a first vertical polar axis, a second loudspeaker enclosure journalled on said second mounting end of said second mounting arm for rotation about a second vertical polar axis, and a first and a second loudspeaker mounted respectively in said first and second loudspeaker enclosures, each of said first and second loudspeakers being mounted with the axis thereof at an acute angle to the horizontal, said loudspeaker enclosures being adjustably relative to each other and to said turntable enclosure in accordance with the acoustical characteristic of the environment for said system.

9. A high fidelity stereop-honic system comprising a support including an upstanding column having an upper end, a turntable enclosure disposed symmetrically of said support and mounted on the upper end of said column, first and second loudspeaker mounting arms extending longitudinally in opposite directions beneath said turntable enclosure and terminating in first and second mounting ends equally spaced beyond the opposite ends of said turntable enclosure, 21 first spherical loudspeaker enclosure journalled on said first mounting end of said first mounting arm for rotation about a first vertical polar axis, a second spherical loudspeaker enclosure journalled on said second mounting end of said second mounting arm for rotation about a second vertical polar axis, first and second loudspeakers, and mounting means within each of said loudspeaker enclosures for mounting said first and second loudspeakers respectively in said first and second loudspeaker enclosures, each of said first and second loudspeakers being mounted With the axis thereof at an acute angle to the horizontal, said loudspeaker enclosures being, adjustably relative to each other and to said turntable enclosure in accordance with the acoustical characteristic of the environment for said system.

10. A loudspeaker construction for a high fidelity stereophonic system comprising a loudspeaker enclosure, a support, means mounting said loudspeaker enclosure for rotation on said support, a loudspeaker, and means mounting said loudspeaker within said loudspeaker enclosure With the axis of said loudspeaker at an angle to the axis of rotation of said loudspeaker enclosure.

11. A loudspeaker construction for a high fidelity stereophonic system comprising a loudspeaker enclosure, 21 support, mounting means including a member disposed substantially vertically on said support and means mounting said loudspeaker enclosure on said member for rotation about the vertical axis of said member, a loudspeaker, and means mounting said loudspeaker within said loudspeaker enclosure with the axis of said loudspeaker at an angle to said vertical axis of said member.

No references cited.

WILLIAM C. COOPER, Primary Examiner.