WO1984000092A1 - Enceintes de haut-parleur - Google Patents

Enceintes de haut-parleur Download PDF

Info

Publication number
WO1984000092A1
WO1984000092A1 PCT/GB1983/000156 GB8300156W WO8400092A1 WO 1984000092 A1 WO1984000092 A1 WO 1984000092A1 GB 8300156 W GB8300156 W GB 8300156W WO 8400092 A1 WO8400092 A1 WO 8400092A1
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeaker
enclosure assembly
covering
loudspeaker enclosure
assembly according
Prior art date
Application number
PCT/GB1983/000156
Other languages
English (en)
Inventor
Brain Mcmahon King
Original Assignee
Psycho Acoustic Res
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Psycho Acoustic Res filed Critical Psycho Acoustic Res
Priority to JP58501905A priority Critical patent/JPS59501087A/ja
Publication of WO1984000092A1 publication Critical patent/WO1984000092A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges

Definitions

  • the invention relates to loudspeaker enclosures. Aspects of the invention are defined in the claims.
  • Figure 1 is a vertical cross-section of a loudspeaker enclosure assembly along the line AA' of Figure 2,
  • Figure 2 is a plan view of the loudspeaker enclosure assembly
  • Figure 3 is a front elevation of the loudspeaker enclosure assembly
  • Figure 4 is an enlarged cross-section of the back wall of the loudspeaker enclosure assembly.
  • the loudspeaker enclosure assembly 2 shown in the drawings comprises a box having a back wall 4, side walls 6 and 8, a top wall 10, a bottom wall 12 and a front wall 14, all of high density chipboard.
  • the front wall 14, often known as the baffle board, has an upper aperture 16 and a lower aperture 18, which respectively receive a high-frequency loudspeaker 20 and a low-frequency loudspeaker 22.
  • the baffle board 14 makes an angle of slightly less than 90 with the bottom wall 12, and thus faces slightly upwards.
  • Front and back walls 4 and 14 are detachable, and are screwed to battens 26, themselves fixed to other walls.
  • a triangular batten 24 is attached to the baffle board between the two apertures, and is parallel to the bottom wall 12.
  • the loudspeaker enclosure assembly has a covering 28 formed of plastics material.
  • This covering 28 comprises an inner layer 30 of expanded polystyrene and a thicker outer layer 32 of foamed neoprene.
  • the covering reduces the spurious sound radiated by the walls of the chipboard box and improves the sound reproduction, partly as a result of the differences in density and compliance of the materials which constitute the covering. Another reason for the improvement is that the neoprene absorbs reflected sound from adjacent surfaces in the room.
  • the triangular batten 24 fixed to the front of the baffle board 14 forms the covering 28 into a step.
  • the plane of the covering 28 in the lower region is spaced from the plane of the rim 34 of the low-frequency loudspeaker 22, and the covering in this region is attached to the box at the triangular batten 24 and at the lateral edges of the bottom wall 12, and side walls 6 and 8.
  • a ring 35 of foamed neoprene isbonded to the innermost of the outer face of the rim 34 of the low-frequency loudspeaker 22, and to the inner surface of the covering 28.
  • the covering 28 over the front wall 14 of the box has two circular apertures.
  • One aperture 36 is coaxial with, and of smaller diameter than the diaphragm 38 of the low-frequency loudspeaker.
  • This aperture 36 has a bevelled edge 40.
  • the spacing between the covering and the diaphragm in this region permits movement of the latter.
  • the second aperture 42 is coaxial with, and 1mm larger in diameter than, the diaphragm 44 of the high-frequency loudspeaker 20.
  • the sound reproduction is further improved by a slot 46 formed in the top wall 10.
  • the slot extends through the chipboard 10 and its covering 28, the latter being bevelled.
  • the slot 46 is a rectangle whose longer axis is substantially parallel to the front of the loudspeaker enclosure.
  • a sheet 48 of sound absorbing material is bonded to the whole of the inner surface of the back wall 4.
  • the material comprises a layer 50 of foamed plastics material laminated to a layer 52 of unfoamed plastics material filled with slate dust. This material is commercially available for industrial soundproofing in which context it is known as industrial barrier matting.
  • the unfoamed plastics side is bonded to the back chipboard wall 4.
  • Sound absorbing material of the same type is bonded to the electromagnet housing 56 oi the low-frequency loudspeaker 22.
  • One sheet is folded into a V-shaped channel 58 and fixed to the housing 56, the width of the longitudinal opening of the channel being of similar size to the diameter of the diaphragm 38 of the loudspeaker 22.
  • a second sheet is joined to the housing 56 and to the first sheet, and covers one of the ends of the channel 58, the other end being left open.
  • the foam side 60 of both sheets faces the diaphragm 38 of the loudspeaker 22.
  • the loudspeaker enclosure assembly 2 is supported on a floor by three feet.
  • the two back feet 62 are rubber blocks of square horizontal cross-section, fixed to the back corners of the bottom wall 12 of the box. The height of the front face of each back foot exceeds the corresponding height of the back face.
  • the feet are of hard rubber of the type used in door stops available tinder the
  • the front, softer rubber foot 64 is a one-piece moulding, which is fixed centrally to the front edge of the bottom wall 12.
  • the foot is of T-shaped profile, as seen from the side.
  • the cross-piece 66 of the 'T' rests on a carpeted floor.
  • the feet 62 ,64 are bonded to the bottom wall 12, the covering
  • An electrical cable not shown extends through a fourrh aperture 67 in the bottom wall 12 and covering 28.
  • the cable links the cross-over unit in the loudspeaker enclosure with the amplifier.
  • the hole 67 is sealed around the cable.
  • the low-frequency loudspeaker 22 is an AUDAX HD 17 B37 and the high-frequency loudspeaker 20 is a KEF T27.
  • the size of the chipboard box, excluding the covering 28 is: height, 305 mm; width, 230 mm; depth at top, 210 mm; depth at bottom, 245 mm.
  • the baffle board 14 is inclined to the bottom face of the loudspeaker enclosure enclosure assembly at an angle of 83.5 and has openings 16, 18 of diameter 72 mm and 147 mm to receive the high- and low-frequency loudspeakers 20, 22, respectively. Additionally a rebate 68 of depth 3 mm and diameter 108 mm is formed around the opening 16 to receive the rim of the high-frequency loudspeaker.
  • the baffle board is 16 mm thick, and the other chipboard walls are 13 mm thick.
  • the triangular batten 24 which forms the step in the front face 14 of the loudspeaker enclosure assembly 2, spaces the covering 28 in the upper and lower regions by 18 mm.
  • the expanded polystyrene layer 30 of the skin is 1.6 mm thick and the neoprene layer 32 is 5 mm thick.
  • the opening 16 over the high-frequency loudspeaker 20 is 28 mm in diameter, and the opening 18 over the low-frequency unit 22 is 87 mm in diameter.
  • the width of the ring 35 in the radial direction is 7 mm.
  • the slot 46 in the top wall 10 of the box is a rectangle of size 22 mm by 6.35 mm. Its central point is 53 ram from the front edges of the top wall.
  • the hole 67 in the bottom wall 12, which receives a cable, is
  • the expanded foam of the sound absorbing layers 48, 54 is 12 mm thick and its laminate is 3 mm thick.
  • the sheet 54 which is bonded to the electromagnet housing 56 is a rectangle 255 mm by 165 mm, the latter dimension being the lateral width of the sheet.
  • the cross-piece 66 of the front foot 64 is 13 mm by 25 mm by 25 mm, and the other part, which joins the cross-piece 66 to the loudspeaker enclosure proper, is 13 mm by 25 mm by 35 mm.
  • the back feet 62 are 23 mm by 23 mm in horizontal cross-section.
  • the rear and front faces are, respectively, 22 mm and 24 mm in height.
  • the width of the longitudual openings of the channel of sound absorbing material behind the low-frequency loudspeaker should be approximately equal to, or greater than, the diameter of its diaphragm.
  • the barrier matting behind the diaphragm should be bonded to a fixture other than the electromagnet housing in such a way as to envelop the diaphragm e.g. by attaching it to the back face of the baffle board.
  • the proportion of the volume of the loudspeaker enclosure to the area of the slot in the top wall 10 should be within the range 60 to 100 (metres) , and the proportion of the area of the slot to the thickness of the top wall 10 of the box should be between 0.008 to 0.012 (metres).
  • the proportion of the volume of the enclosure to the thickness of the top wall is preferably between 0.48 and 1.2 metres 2 .
  • a sound absorbing strip for example, a thin cylinder of textile-covered, soft rubber a few millimetres in diameter, on the outer face of the loudspeaker enclosure, around one or more of the sound emitting apertures adjacent the edges of the apertureor apertures, and/or along the edges of the front face of the enclosure.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

Un assemblage d'enceintes de haut-parleur (2) comprend une boîte en bois aggloméré recouverte d'un matériau absorbant le sang. Le matériau comprend une couche interne en polystyrène expansé et une couche extérieure en néoprène à cellules fines, pour améliorer la reproduction sonore. L'assemblage d'enceintes de haut-parleur présente des ouvertures au-dessus du haut-parleur de haute fréquence (20), du haut-parleur de basse fréquence (22) et dans la paroi supérieure (10). La paroi frontale (14) de l'assemblage d'enceintes de haut-parleur présente un gradin (24), de manière à créer un interstice entre la couverture et le haut-parleur de basse fréquence (22). Un anneau (35) de matériau plastique est lié à la couverture et au bord du haut-parleur de basse fréquence. Un tapis en mousse phono-absorbante (48, 54) doublé d'une pellicule de matériau plastique rempli non expansé est collé sur la paroi arrière (4) de l'assemblage d'enceintes de haut-parleur (2) et sur l'arrière de l'enceinte de l'électro-aimant (56). L'assemblage d'enceintes de haut-parleur (2) repose sur trois pieds. Les deux pieds arrière (62) se composent de caoutchouc dur et le pied avant (64) se compose d'un caoutchouc plus mou.
PCT/GB1983/000156 1982-06-15 1983-06-15 Enceintes de haut-parleur WO1984000092A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58501905A JPS59501087A (ja) 1982-06-15 1983-06-15 ラウドスピ−カ密閉箱

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08217351A GB2123250A (en) 1982-06-15 1982-06-15 Loudspeaker enclosures

Publications (1)

Publication Number Publication Date
WO1984000092A1 true WO1984000092A1 (fr) 1984-01-05

Family

ID=10531058

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1983/000156 WO1984000092A1 (fr) 1982-06-15 1983-06-15 Enceintes de haut-parleur

Country Status (4)

Country Link
EP (1) EP0097061A1 (fr)
JP (1) JPS59501087A (fr)
GB (1) GB2123250A (fr)
WO (1) WO1984000092A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115209257A (zh) * 2022-09-14 2022-10-18 歌尔股份有限公司 发声装置的壳体、发声装置及电子设备

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1218937A (fr) * 1984-01-06 1987-03-10 William Wright M.D. Enceinte acoustique a couche limite de controle
HU193767B (en) * 1985-05-31 1987-11-30 Elektroakusztikai Gyar Loudspeaker, favourably sound column or horn loudspeaker
DE3920041C1 (fr) * 1989-06-20 1990-12-06 Amneus Engineering, Vaellingby, Se
FR2676322B1 (fr) * 1991-05-10 1994-06-10 Charlet Francois Dispositif acoustique pour amortir et filtrer les emetteurs de son en general et les enceintes en particulier.
SE0501267L (sv) 2005-06-03 2006-07-18 Tommy Skogsberg Akustisk form resistans

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE673136A (fr) *
GB747263A (en) * 1953-05-21 1956-03-28 Goodmans Ind Ltd Improvements in or relating to loudspeaker cabinets
DE1018467B (de) * 1955-12-20 1957-10-31 Rundfunk Betr Stechnik G M B H Lautsprecher mit geringen Schwankungen des UEbertragungsmasses
US3720285A (en) * 1970-06-30 1973-03-13 Rand Org Ltd Loudspeakers
US4127551A (en) * 1973-03-05 1978-11-28 E. I. Du Pont De Nemours And Company Mixed esters of dibasic unsaturated acids, glycols and glycidyl esters
US4167985A (en) * 1976-05-13 1979-09-18 Dunlavy John H Speaker system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB337739A (en) * 1929-07-01 1930-11-03 Kolster Brandes Ltd Improvements relating to cabinets for housing acoustic devices
GB857077A (en) * 1958-04-24 1960-12-29 Watts Ltd Cecil E Improvements in and relating to sound radiators
GB890886A (en) * 1958-11-06 1962-03-07 Wharfedale Wireless Works Ltd Loudspeaker cabinets
BE794703A (fr) * 1972-01-31 1973-07-30 Acoustic Fiber Sound Systems Systeme de reproduction de son
ZA723011B (en) * 1972-05-03 1973-08-29 J Albertyn A speaker enclosure
US4127751A (en) * 1975-11-27 1978-11-28 Pioneer Electronic Corporation Loudspeaker with rigid foamed back-cavity
GB1591042A (en) * 1978-05-03 1981-06-10 Bibby P J Loudspeaker cabinet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE673136A (fr) *
GB747263A (en) * 1953-05-21 1956-03-28 Goodmans Ind Ltd Improvements in or relating to loudspeaker cabinets
DE1018467B (de) * 1955-12-20 1957-10-31 Rundfunk Betr Stechnik G M B H Lautsprecher mit geringen Schwankungen des UEbertragungsmasses
US3720285A (en) * 1970-06-30 1973-03-13 Rand Org Ltd Loudspeakers
US4127551A (en) * 1973-03-05 1978-11-28 E. I. Du Pont De Nemours And Company Mixed esters of dibasic unsaturated acids, glycols and glycidyl esters
US4167985A (en) * 1976-05-13 1979-09-18 Dunlavy John H Speaker system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115209257A (zh) * 2022-09-14 2022-10-18 歌尔股份有限公司 发声装置的壳体、发声装置及电子设备

Also Published As

Publication number Publication date
EP0097061A1 (fr) 1983-12-28
GB2123250A (en) 1984-01-25
JPS59501087A (ja) 1984-06-21

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