US3360072A - Sound reproducing apparatus - Google Patents

Sound reproducing apparatus Download PDF

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Publication number
US3360072A
US3360072A US541690A US54169066A US3360072A US 3360072 A US3360072 A US 3360072A US 541690 A US541690 A US 541690A US 54169066 A US54169066 A US 54169066A US 3360072 A US3360072 A US 3360072A
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wall
high frequency
sound
room
casing
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Carlsson Stig
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    • 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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers

Definitions

  • This invention relates to an improved sound reproducing apparatus.
  • the invention is concerned with the location and orientation of the high and mid frequency sound radiating means with respect to each other and with respect to an adjacent wall of the room.
  • An object of my invention is to provide the most favorable transmission of sound from the sound reproducing apparatus to the listenerwhen both are located in a socalled listening room, which may be the average moderately damped living room.
  • a mid frequency sound radiation source which may be either a diaphragm type speaker, or a horn type speaker, or a port or opening in a loudspeaker cabinet, close to a wall, with the axis of the source arranged substantially parallel to the wall, and a high frequency radiation source arranged at least partially facing the wall.
  • the source is diffuse and appears to be located in the plane of or behind the plane of the adjacent vertical wall of the room.
  • the listening room appears to be enlarged, extending beyond the wall, giving one the impression that he is located in the concert hall where the music has been recorded.
  • the reproduction is substantially uniform in all directions and practically independent of the distance between the listener and the apparatus; in particular, iniproved reproduction is obtained even though the listener is only a few feet from the apparatus.
  • the present invention accomplishes the foregoing objectives with a minimum of disturbances due to a certain time lag phenomena with respect to mid frequency sounds, and due to intensity differences with respect to high frequency sounds. Such disturbances may cause listener fatigue.
  • the present invention provides a combination of a highly diffused sound field for the high frequency range and a substantially unidirectional sound field for the mid frequency range. This combination is found to result in an increased perceivability of the sound reproduced, while at the same time providing the impression of plasticity previously mentioned.
  • the wall spacing referring to the spacing between the mid frequency source and the adjacent wall, should be small.
  • the sound from the image of the mid frequency source will arrive at the listeners head with a time lag sutciently short as to be within the reaction time of human hearing.
  • the reiiected sound wave is of an intensity comparable to that of the direct source, and the image and the direct source together ⁇ provide a substantial unidirectional sound field.
  • the high frequency source or sources should be spaced more remotely from the adjacent wall so as to produce a two directional sound field.
  • This two directional sound field plus the reections from the other walls of the room have been found to create a much more diffuse sound field for high frequencies than that obtained by a unidirectional sound field plus reflections.
  • the mid range source when the mid range source is located with its axis substantially parallel to the adjacent wall, that the proximity of the mid range source to the wall does not create the expected interference at the theoretically calculated frequency. This is believed to be due to the fact that the area of the sound source, being substantial, provides a considerable variation in the wall spacing of the near and remote points on the surface of the speaker diaphragm relative to the wall spacing of the axis of the diaphragm.
  • the mid 'frequency source plus its image together constitute a single sound source which is free from wall interference, and which provides a unidirectional sound field in the listening room.
  • FIG. l is a side elevation showing an embodiment of my invention, partially broken away, and showing also the relationship of the speaker apparatus to the wall and oor of the room;
  • FIG. 2 is a plan view of FIG. 1;
  • FIGS. 3 and 4 are plan views similar to FIG. 2 but showing modifications
  • FIG. 3a is a fragmentary elevation of FIG. 3;
  • FIG. 5 is a fragmentary elevation of the high frequency speaker shown in FIG. 4;
  • FIG. 6 is an enlarged section taken along line 6-6 of FIG. 4;
  • FIG. 7 is a section of a geometrical figure illustrating the meaning of omnidirectional in a substantially horizontal plane
  • FIGS. 8, 9 and 10 are perspective views of modified arrangements.
  • FIG. 11 is a plan view of a further modification.
  • the reference numeral 25 designates a mid frequency radiating means in the form of an 8 inch speaker mechanism adapted to radiate sound in the frequency range of from 200 to 400 c.p.s. up to 2000 to 3000 c.p.s.
  • the reference numeral 26 designates high frequency radiating means in the form of a 2 inch speaker mechanism adapted to radiate sound in the frequency range of from 2000 to 3000 c.p.s. up to 12,000 to 16,000 c.p.s.
  • the speakers are located near the vertical wall 2 of a room, the mid frequency speaker 25 being oriented to face in a direction parallel to the plane of the wall 2, in this instance upwardly, so that its axis is vertical, and spaced from the wall by a distance S-1, from 6 to 11 inches.
  • the high frequency speaker 26 faces the Wall 2, and is located at a distance S-2 from the wall, in excess of 12 inches, approximately 20 inches is the preferred wall spacing for normal living rooms. In halls and theaters, the wall spacing S-2 is preferably greater than 20 inches.
  • Suitable means are provided for supporting the speakers 25 and 26 in this position, the supporting means shown being in the form of a casing 27 which rests on the floor 1 of the -roorn with the rear end 5 positioned adjacent to the room wall 2.
  • the casing 27 provides an enclosure for speaker 25 so that the sound radiation will originate only in the upper surface of the speaker d1aphragm.
  • the high frequency radiating means also includes a second mechanism 30 which faces outwardly into the room.
  • This may be mounted in the front wall of the casing as shown in FIGS. 1 and 2, or it may be mounted on the top wall of the casing as shown at 30 in FIG. 3, or FIGS. 8, and 1l.
  • the exact location is not particularly important, and it may be located between they mid frequency speaker and the wall as shown in FIGS. 3 and l1, or between the mid frequency speaker and the room as shown in FIGS. 1, 8 and l0.
  • the important thing is that there be a substantial spacing between the high frequency image 29 and the high frequency speaker 30, so as to puroduce a two directional sound field within the room.
  • an acoustical image 28 of the mid frequency speaker 25 is formed back of the adjacent wall 2, and the spacing between the two is sufficiently close, being from l2 to 22 inches, as to constitute in effect a single source of mid frequency sound, thus producing a unidirectional sound field within the room, having its source located in or somewhat behind the plane of the wall 2.
  • the high frequency sound field in the room is a two directional field for the purpose of exciting refiections.
  • Side refers to walls 2l, 22 [FIG. 2] as contrasted with adjacent wall 2.
  • the intensity of sound radiated from the image 29 is close enough to the intensity of the sound radiated from the speaker 30, that both radiations could be considered as being of primary intensity, as contrasted with the first reflections from the side walls and ceiling, which are less intense and could be considered as being of secondary intensity.
  • the high frequency speaker 26 also radiates outwardly into the room, so that the spacing between the speaker 26 and ⁇ its image 29 is sufficient to produce a two directional sound field at the lower high frequency range.
  • either a separate low frequency speaker may be provided, as shown at 1.0L in FIG. 8, or the response of the speaker 25 can be extended downwardly as explained hereinafter in connection with FIG. 10; namely, from 40 c.p.s. up to 2000 to 3000 c.p.s.
  • the high frequency speaker mechanisms 26 and 30 have an outside diameter of 2 inches, the effective cone diameter being 11/2 inches.
  • the speaker is of the closed back type and does not have any separate baffle or other type of enclosure that wouldl prevent the free radiation of sound.
  • the speaker is nondirectional or omnidireetional over the whole sphere up to 4000 c.p.s. It is omnidirectional over the frontal hemisphere up to 5000 c.p.s.; it is nondirectional forwardly within 60 degrees off its axis up to 7000 c.p.s., and it is nondirectional forwardly within 45 degrees off its axis up to 10,000 c.p.s.
  • the latter Itwo criteria refer to ⁇ a listening area circumscribed by a 120 degree cone and a listening area circumscribed by a degree cone, within which listening areas the source is nondirectional within the above definition up to 7000 c.p.s. and 10,000 c.p.s., respectively.
  • a second 2 inch high frequency speaker 30 when added, as shown in FIGS. 2 and 3, but facing outwardly into the room, the combination of the two speakers 26 and 30 or 30 provide omnidirectional radiation over the 4full sphere up to 5000 c.p.s., creating a two directional sound field for all non-axial listening positions in the room. Also a two directional sound field is created up t0 7000 ⁇ c.p.s. for non-axial listening positions less than 60 degrees off axis, and up to 10,000 c.p.s. for nonvaxial listening positions less than 45 degrees off axis, which means that for most listening positions and for the most important part of the high frequency range, there is a two directional field insofar as the adjacent wall 2 is concerned.
  • the diffuse sound fiel-d occurs at all points in the room for sounds up to 5000 c.p.s. At the higher frequencies, such doubling occurs only in listening positions which are further back in the room, which would indicate that the diffusivity at the middle and back of the room is somewhat more perfect (that is, the distribution of intensities for the different directions as well as the number of directions) than farther forward.
  • the cylindrical speaker 31 of FIGS. 4, 5 and 6 is mounted on the casing 27 by a suitable support means 32, As shown in FIG. 6, it comprises a number of concentric cylindrical elements which are separated by spacers.
  • This is an electrostatic speaker in the form of a cylindrical push-pull -radiator comprising two concentric cylinders 33 and 34 of insulated steel wire mesh which serve as the two fixed electrodes. Located between these two fixed electrodes is an almost weightless electrically conductive mesh diaphragm 35, substantially .0005 inch thick which floats between two surrounding films 36 of a light plastic film, substantially .0004 inch thick.
  • the space between the two films 36 and the conductive diaphragm 3S is Sealed by suitable means, such as pressure sensitive tape 37.
  • the wire mesh electrodes 33 and 34 are securedv to each other and to the diaphragm assembly 35-36 by plastic ring-shaped spacers 38 substantially .030 inch thick, the spacer rings 38 also being connected to the supporting stem 32 by suitable spiders.
  • the fixed electrodes 33 and 34 are connected to a suitable source of DC voltage.
  • the diaphragm 35 is electrically attracted to one or the other of the electrodes 33, 34, and in so doing, moves the thin plastic films 36 as well as the air between the film and the fixed electrode.
  • the sound energy so developed passes through the acoustically transmissive mesh of the fixed electrode 33 toward the listeners.
  • omnidirectional radiation is provided in a substantially horizontal plane, the field of radiation being diagrammatically illustrated by the outwardly diverging generally disk-shaped geometrical figure 39 shown in FIG. 7.
  • FIG. 8 shows a further modification, the mid range speaker 6L being mounted in the top wall 7 of a casing 20, the casing being placed in direct contact with the adjacent room wall 2.
  • the high frequency radiating means comprises an array of four 2 inch speakers 8 and 9, the speakers 8 being oriented rearwardly at an angle of substantially 45, and the speakers 9 being oriented out- Wardly into the room at about 45.
  • there are low frequency radiating means in the lower portion of the casing 20 which comprise a l0 inch speaker 10L and resonator tubes 11R.
  • a separate channel is provided for driving the low frequency speaker L and which has a frequency response from about 25 or 30 c.p.s. up to 200 or 400 c.p.s.
  • the casing is provided with legs 3 which space the bottom wall of the casing about 4 inches above the door 1.
  • a driving amplifier 12 may be secured to the bottom wall 4.
  • FIG. 9 shows the upper part of a loud speaker apparatus according to FIG. 8 which is designed for the highest quality of sound reproduction for large rooms or halls where the apparatus of FIG. 8 would be underpowered.
  • this FIG- 9 arrange-ment there are three like arrays of high frequently speakers, one, comprising the four speakers 8 and 9 being mounted on the top wall 7, as in FIG. 8, one array 8', 9 being mounted on a vertical side Wall 13 of casing 20, and the third array being mounted on the opposite side wall 13".
  • FIG. 9 shows a further modification in which the mid frequency radiation means is mounted in the upper portion of the vertical side walls 13 and 13 of the cabinet, rather than in the top wall.
  • the mid frequency radiation means 6 6 is symmetrically oriented with respect to a medial vertical plane extending through the casing 20 and perpendicular to the wall 2 and with the effective center of mid frequency radiation located midway between the two speakers 6 and 6".
  • the exact orientation of the mid range radiation means 25, or 6-6 .e., facing sideways, upward, or diagonally, is not particularly important as long as the above symmetrical orientation is maintained.
  • the speaker 16L mounted in the top wall 7 of the casing 20 has both low and mid range frequency response, ranging from about 40 c.p.s. up to about 2000 or 3000 c.p.s.
  • This radiation source may be an 8 inch speaker.
  • the high frequency radiating means comprises an array of three 2 inch speakers 8 and 9, the speakers 8 being oriented partially toward the adjacent wall 2 and the speaker 9 facing out into the room.
  • the speakers 8 and 9 are shown as being tilted upwardly, which tends to utilize the reflections from the ceiling to a greater extent than when the axis of the high frequency speakers are horizontal.
  • the purpose of the array of three or four 2 inch speakers, as shown in FIGS. 10 and 8, is to utilize more fully the side wall reflections in the main part of the high frequency range.
  • a radiation which is omnidirectional in a horizontal plane up to from 9000 to 12,000 c.p.s.
  • the speakers are tilted upwardly from 20 to 25, it is possible to obtain nondirectional radiation throughout the full top hemisphere.
  • a extends from at least- 25 to 0 to 45 to -10 to +90 +45 +10 0.17.3. 0.30.3. 0.13.3.
  • the speaker array is nondirectional or omnidirectional within the horizontal plane, and in the case of FIG. 8, the radiation is nondirectional, not only for the full top hemisphere, but also down to 25 below the horizontal plane.
  • the diffuse sound field created by the side wall refiections from the two separate and widely spaced high frequency sources, the array itself and its image behind the adjacent wall, irons out any interferences at certain frequencies and directions which might otherwise be expected to occur from the use of a plurality of closely spaced speaker mechanisms in the array.
  • FIG. 11 shows a further modification in which the casing 40 has a mid range speaker 42 mounted in the top wall 41 thereof.
  • the casing 40 has a mid range speaker 42 mounted in the top wall 41 thereof.
  • there is an array of four high frequency speakers 43 and 44 the speakers 43 being oriented rearwardly at an angle of substantially 45, and the speakers 44 being oriented outwardly into the room, at an angle of about 45.
  • the high frequency speakers are disposed on opposite sides of the mid range speaker 25, or 42, respectively, in a symmetrical arrangement.
  • the advantage of this symmetrical arrangement is that it makes no difference as to which of the end walls 48 of the casing 40 is placed adjacent the wall 2 ofthe room.
  • openings 46 are also provided in the side walls which are covered with wire netting 47. Where the high frequency speakers are tilted upwardly as shown in FIGS. 8 and 10, the side openings 46 are not necessary.
  • one object is to maintain the time lag between the mid frequency speaker 25 and its image 28 at about one millisecond or less. Time lags materially greater than this, and particularly at 3 to 4 milliseconds create masking effects in the ear which impede resolution of sounds.
  • the wall spacing per millisecond image time lag is 6% inches straight in front of the speaker system, and 91/2 inches as an effective means value integrated over all directions. The effect lof increasing the wall spacing from its minimum value is very gradual. Wall spacings of from 9 to 11 inches have been found to be satisfactory, but from 6 to 9 inches are preferred. Examples of axis locations are given in the drawings.
  • the wall spacing of low frequency sources L and 11R is not particularly critical in this respect, but is determined by other criteria.
  • the speaker 25 can be located in the casing so that the distance between its axis and the rear wall is the same as the desired wall spacing.
  • the axis to rear wall dimension may be an inch or two less than the desired wall spacing to permit a slight gap between the rear end or wall 5 and the adjacent wall 2, as shown in FIGS. 1, 4 and 1l.
  • the rim of the speaker 25 will be very close to the rear casing wall 5, as shown in FIGS. l and 2, and its axis will be spaced from the casing wall 5 by less than onehalf the distance between the wall 5 and the rearwardly oriented high frequency radiating portion as indicated by the legends in FIG. 4.
  • the image 29 in effect constitutes a sound source of an intensity of the same order as the direct source 30, and the two directional sound field thus created is much more efficient in creating a high frequency diffuse sound field in the room than the source 30 alone.
  • the listeners head creates disturbances in a unidirectional and even in a multidirectional sound field so that the intensity levels at the two ears are quite different, amounting frequently to db or more, and the intensities and the difference. between them change with the turning of the head.
  • These disturbances sometimes called directional effects because they are helpful in determining direction, are disturbing and result in listener fatigue, and they result in a far from smooth frequency response curve to the listeners ears even though a measuringy micro-phone wouldI record a smooth response in the absence of the head.
  • the two directional sound field produced by an image and a direct sound source will excite reflections resulting in a more perfectly diffuse sound field than that excited by a unidirectional source.
  • the image should be sufficiently close to the direct source as to constitute an effective sound source of an intensity of the same order as the intensity ofthe direct source.
  • FIG. l arrangement provides a diffuse high frequency sound field for the most important frequencies and most listening positions in the room whereas the arrangements of FIGS. 4 and 8 to 1l extend the frequency range and the listening area.
  • Sound reproducing apparatus comprising a casing having a front end and a rear end, high frequency radiating means comprising at least one loud speaker mechanism mounted on said casing, said high frequency radiating means having a plurality of main directions of radiation oriented in widely diverging directions including a forwardly direction and a rearwardly direction, mid frequency radiating means radiating approximately the 400 to 2000 c.p.s. range comprising a loud speaker mechanism mounted on the top of said casing and oriented substantially upwardly and having its center of radiation located closer to said rear end of the casing than the rearwardly oriented radiating portion of said high frequency radiatmg means.
  • Sound reproducing apparatus comprising a casing having a front end and a rear end, high frequency radiating means comprising at least one loud speaker mechanism mounted ⁇ on said casing, said high frequency radiating means having a plurality of main directions of radiation oriented in widely diverging directions including a forwardly direction and a rearwardly direction, and mid frequency radiating means radiating approximately the 400 to 2000 c.p.s.
  • a plurality of loud speaker mechanisms mounted on said casing and having their directions of orientation arranged to 'be wid-ely diverging and substantially symmetrical with respect to a vertical medial plane extending from the front end to the rear end of said casing, the effective center of mid frequency radiation of said plurality of loud speaker mechanisms being located closer to said rear end of the casing than the rearwardly oriented radiating portion of said high frequency radiating means.
  • Sound reproducing apparatus as claimed in claim 9 which includes a loud speaker mechanism located close to said rear end and radiating the low frequency range.
  • Sound reproducing apparatus for use in a room having at least one substantially vertical wall
  • said apparatus including a casing having front and rear walls and a substantially horizontal top wall with a loudspeaker opening near said rear wall,
  • a loudspeaker mechanism mounted in said opening and radiating the mid frequency range
  • a plurality of loudspeaker mechanisms mounted on said top wall and radiating the high frequency range and facing t-oward a common center and inclined slightly upward to simulate omnidirectional radiation in a substantially horizontal direction
  • At least one of said high frequency range loudspeaker 10 mechanisms being located near said front wall and oriented to direct its sound beam toward the vertical wall of said room when said rear wall is placed close to said vertical wall,
  • said high frequency loudspeaker mechanisms being spaced further away from the rear wall of said casing than said mid frequency range loudspeaker mechanism.
  • said apparatus including a casing having a front wall
  • a rear Wall adapted to be located yadjacent to said vertical room wall, and a substantially horizontal top wall
  • a loudspeaker mechanism mounted on said top wall near said rear Wall and radiating the mid frequency range
  • At least three loudspeaker mechanisms mounted on said top wall and radiating the high frequency range and facing in horizontally different directions with respect to a common center to simulate omnidirectional radiation in a substantially horizontal direction
  • At least one of said high frequency range loudspeaker mechanisms being oriented rearwardly to direct its sound beam toward the vertical wall of said room when said apparatus is located with its rear wall adjacent to said vertical room wall,
  • said rearwardly oriented high frequency loudspeaker mechanism being spaced further away from the rear wall of said casing than said mid frequency range loudspeaker mechanism.
  • Sound reproducing apparatus as claimed in claim 18 which includes a loudspeaker mechanism located close to said rear wall and radiating the low frequency range.
  • said device including a casing having a front wall, a
  • rear wall adapted to be located adjacent to said vertical room wall, and a substantially horizontal top wall
  • a loudspeaker mechanism mounted on said top wall with its center of radiation located substantially siX inches from said rear wall and radiating the mid frequency range
  • At least three loudspeaker mechanisms mounted on said top wall and radiating the high frequency range and facing in horizontally different directions with respect to a common cen-ter to simulate omnidirectional radiation in a substantially horizontal direction,
  • At least one of said high frequency range loudspeaker mechanisms being oriented rearwardly to direct its sound beam toward the vertical wall of said room when said apparatus is located with its rear wall adjacent to said vertical room wall,
  • said rearwardly oriented high frequency loudspeaker mechanism being located with its center of radiation at least twelve inches from said rear wall.
  • said device including a casing having a front wall, a rear wall ladapted to be located adjacent to said vertical room wall, and a substantially horizontal top wall,
  • a loudspeaker mechanism mounted on said top wall and radiating the mid frequency range
  • said -apparatus including a casing having a front wall
  • a rear wall adapted to be located adjacent to said vertical room wall, and top and side walls which bound the space between said front and rear walls.
  • a loudspeaker mechanism mounted on one of said bounding walls and radiating the mid frequency range
  • at least three means mounted on one of said bounding walls and radiating the high frequency range and facing in different directions with respect to a common center
  • at least one yof said high frequency range radiating means being oriented rearwardly to direct its sound beam toward the vertical wall of said room when said apparatus is located with its lrear wall adjacent to said vertical roorn wall, said rearwardly oriented high vfrequency range radiating means being spaced further away from the rear wall of said casing than said mid frequency range loudspeaker mechanism.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
US541690A 1962-10-12 1966-04-11 Sound reproducing apparatus Expired - Lifetime US3360072A (en)

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SE10974/62A SE304309B (fr) 1962-10-12 1962-10-12

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US (1) US3360072A (fr)
DE (1) DE1303535B (fr)
DK (1) DK106677C (fr)
GB (1) GB1012505A (fr)
NL (2) NL146356B (fr)
SE (1) SE304309B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3590942A (en) * 1969-12-15 1971-07-06 Scott Inc H H Omnidirectional loudspeaker system
US3818138A (en) * 1971-07-26 1974-06-18 A Sperrazza Barrel shaped speaker enclosure
US3848090A (en) * 1971-11-18 1974-11-12 J Walker Wall hanging speaker system
US4006308A (en) * 1974-07-25 1977-02-01 Karl Otto Ponsgen Loudspeaker arrangement
US4006311A (en) * 1973-08-24 1977-02-01 Stig Carlsson Stereophonic sound reproducing apparatus
USRE31228E (en) * 1967-12-04 1983-05-03 Bose Corporation Loudspeaker system
US4558762A (en) * 1981-11-26 1985-12-17 Stig Carlsson Loudspeaker
US20150086965A1 (en) * 2013-09-20 2015-03-26 Bose Corporation Audio Demonstration Kit
USD919596S1 (en) * 2019-08-15 2021-05-18 Kye Systems Corp. Speaker

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670842A (en) * 1970-07-23 1972-06-20 Ekdahl & Olofsson Handelsbolag Loudspeakers
US3983333A (en) * 1974-03-01 1976-09-28 Allison Acoustics Inc. Loud speaker system
US4410063A (en) * 1981-03-04 1983-10-18 Onkyo Kabushiki Kaisha Loudspeaker system
DE4036152A1 (de) * 1990-11-14 1992-05-21 Dieter Lang Lautsprecheranordnung
GB2345608A (en) * 1999-01-05 2000-07-12 Yoshito Maruo A loudspeaker

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US2275610A (en) * 1941-01-23 1942-03-10 Bucky Gustav Loudspeaker system
US2819772A (en) * 1954-12-14 1958-01-14 Lab Of Electronic Engineering Wide range loudspeaker
US2824617A (en) * 1952-09-15 1958-02-25 Philips Corp Sound reproducing device
US2904123A (en) * 1956-09-27 1959-09-15 Nigro John Loud-speaker enclosures
FR1199441A (fr) * 1958-02-26 1959-12-14 Procédé et dispositifs de restitution de l'espace sonore dans des locaux de faibles ou moyennes dimensions
US2921135A (en) * 1958-01-27 1960-01-12 Electro Voice Electroacoustical device
US2979149A (en) * 1953-10-02 1961-04-11 Carlsson Stig Loudspeaker apparatus
US3069958A (en) * 1959-09-24 1962-12-25 Wurlitzer Co Vibrato apparatus
US3070660A (en) * 1961-05-29 1962-12-25 Wurlitzer Co Rotary electrical apparatus
US3157247A (en) * 1962-04-25 1964-11-17 Nippon Musical Instruments Mfg Sound producing system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2275610A (en) * 1941-01-23 1942-03-10 Bucky Gustav Loudspeaker system
US2824617A (en) * 1952-09-15 1958-02-25 Philips Corp Sound reproducing device
US2979149A (en) * 1953-10-02 1961-04-11 Carlsson Stig Loudspeaker apparatus
US2819772A (en) * 1954-12-14 1958-01-14 Lab Of Electronic Engineering Wide range loudspeaker
US2904123A (en) * 1956-09-27 1959-09-15 Nigro John Loud-speaker enclosures
US2921135A (en) * 1958-01-27 1960-01-12 Electro Voice Electroacoustical device
FR1199441A (fr) * 1958-02-26 1959-12-14 Procédé et dispositifs de restitution de l'espace sonore dans des locaux de faibles ou moyennes dimensions
US3069958A (en) * 1959-09-24 1962-12-25 Wurlitzer Co Vibrato apparatus
US3070660A (en) * 1961-05-29 1962-12-25 Wurlitzer Co Rotary electrical apparatus
US3157247A (en) * 1962-04-25 1964-11-17 Nippon Musical Instruments Mfg Sound producing system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31228E (en) * 1967-12-04 1983-05-03 Bose Corporation Loudspeaker system
US3590942A (en) * 1969-12-15 1971-07-06 Scott Inc H H Omnidirectional loudspeaker system
US3818138A (en) * 1971-07-26 1974-06-18 A Sperrazza Barrel shaped speaker enclosure
US3848090A (en) * 1971-11-18 1974-11-12 J Walker Wall hanging speaker system
US4006311A (en) * 1973-08-24 1977-02-01 Stig Carlsson Stereophonic sound reproducing apparatus
US4006308A (en) * 1974-07-25 1977-02-01 Karl Otto Ponsgen Loudspeaker arrangement
US4558762A (en) * 1981-11-26 1985-12-17 Stig Carlsson Loudspeaker
US20150086965A1 (en) * 2013-09-20 2015-03-26 Bose Corporation Audio Demonstration Kit
US10629085B2 (en) * 2013-09-20 2020-04-21 Bose Corporation Audio demonstration kit
USD919596S1 (en) * 2019-08-15 2021-05-18 Kye Systems Corp. Speaker

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Publication number Publication date
SE304309B (fr) 1968-09-23
NL298920A (fr)
DK106677C (da) 1967-03-06
NL146356B (nl) 1975-06-16
DE1303535B (fr) 1972-02-03
GB1012505A (en) 1965-12-08

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