US3680658A - Loudspeaker box for a preferably dynamic loudspeaker - Google Patents

Loudspeaker box for a preferably dynamic loudspeaker Download PDF

Info

Publication number
US3680658A
US3680658A US141665A US3680658DA US3680658A US 3680658 A US3680658 A US 3680658A US 141665 A US141665 A US 141665A US 3680658D A US3680658D A US 3680658DA US 3680658 A US3680658 A US 3680658A
Authority
US
United States
Prior art keywords
cabinet
loudspeaker
walls
partition
front wall
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US141665A
Other languages
English (en)
Inventor
Helmut Goeskel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NECKERMANN VERSAND KGAA
Original Assignee
NECKERMANN VERSAND KGAA
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
Priority claimed from DE19702022612 external-priority patent/DE2022612C/de
Application filed by NECKERMANN VERSAND KGAA filed Critical NECKERMANN VERSAND KGAA
Application granted granted Critical
Publication of US3680658A publication Critical patent/US3680658A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H04R1/2873—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers

Definitions

  • the cabinet because of its novel provide important advantages, ous constructions, as .regards cabinet and the cabinet.
  • Some loudspeaker cabinets can be closed on all sides, filled with cottonwool or the like and can be usually equippedwith several loudspeakers, the frequency range of the cabinet being divided by frequency dividers into low tones, medium tones and high tones.
  • Such cabinets have numerous disadvantages, for example: only one side of the loudspeaker diaphragm is effective; the efficiency of the cabinet is low; a standard straight "frequency curve is, in practice, scarcely or never achieved, because'the overlaps .of the separate frequency curve portions are added either to form curve peaks or curve troughs which resemble resonance points; even the best frequency switches also construction, may as compared with previthe dimensions of the quality of the tone reproduced by the change the frequency pattern; deviations in the manufacture of cabinets are unavoidable and as a consequence it is very diflicult, to produce a number of cabinets, the quality of which cabinets is consistent throughout the number produced. inconsistencies between cabinets can be noticed by ear if a number of such loudspeakers are compared by means of quick switching over during amusic transmission.
  • compact cabinets in the low bass region, have a distortion factor-up to thirty times greater than HiFi" instruments.
  • compact cabinets require large'final' amplifier outputs, [in order 'constand to transit to some extent the high-losscorrectly bent frequency curve. Since it is only possible to control amplifiers with abouthalf the nominal output, for
  • a large number of sources of errors and disadvantages would be able to be improved or avoided if a single high quality loudspeaker could be installed within a cabinet, instead of having separate loudspeakers for low, medium and high frequency ranges.
  • mini-cabinets which are bought on a particularly large scale because little space is available in modern dwellings, it would be particularly advantageous for the cabinet to contain only one loudspeaker.
  • the smaller mini-cabinets are made, the more numerous are their disadvantages due to their small physical size,
  • the poorer their eflrciency becomes and the weaker their bass volume becomes since, with extremely small cabinets, it is solely the rigidity of the enclosed air together with the mass of the vibrating diaphragm which determines the lower frequency limit of a particular cabinet. Consequently, in a very small cabinet, the loudspeaker diaphragm is sometimes made artificially heavier, in order that the diaphragm may radiate 6 low bass notes. For example, a diaphragm which could radiate a genuine 30 c/s, without artificial weighting,
  • Reflex cabinem are also known, which have a window of certain area and depth somewhere in a cabinet wall.
  • the window provides a phase reversal for vibrations of the rear side of the loudspeaker diaphragm and thus facilitates the use of both sides of the diaphragm for the production of sound in a forward direction.
  • the mode of operation of the window is often explained by an electrical equivalent circuit diagram consisting of vcapacitancei, self-inductances and ohmic resistances.
  • Resistance, capacitance and self-inductance, in series, represent, respectively, mass, elasticity and radiation resistance of the cabinet.
  • Therear side output of the loudspeaker diaphragm is'tumed, by capacitances and inductances (cabinet and window volumes), through 90 180 and activated with the resistance of the operating window volume as radiation resistance.
  • Such reflux cabinets can have cabinet volumes of from 30 to 500iliters and windows having areas up to 900 cm; they can transmit frequencies down to 20 c/s. Inultra-small forms, theymight have volumes in the region of 20 liters and still be able to transmit a frequency of c/s.
  • bass reflex cabinets have a tendency to boom and give booming bass tones.
  • This disadvantage can be weakened by local damping measures, to the disadvantage of the total efficiency of the cabinet, for example by the window of the cabinet being closed with waste material and byproviding loose cottonwool asa lining around the loudspeaker diaphragm basket.
  • the cabinet can thus be improved with regard to bass fi'equencies whilst making it worse in other respects.
  • development possibilities are obtained fi'om the pitch.
  • reflux windows have undisputed advantages: the total efiiciency is considerably in-, creased; a balancing of the diaphragm acceleration favors a more uniform soundradiation; and the'production of the bass humps of the sound pressure curve facilitates the radiation of bass tones.
  • a loudspeaker cabinet comprising:
  • spacing means arranged between said front wall and said partition such that said front wall and said partition 5 define an annular gap about the rims of said sound foam material disposed within said cabinet to define at least one damping wall and at least onedamping chamber within said cabinet.
  • the bracing means may extend between two opposite ones of said side walls, or may extend between said rear wall and said loudspeaker means.
  • the bracing means may extend between said opposite ones of said side walls and also between said rear wall and said loudspeaker means.
  • said other edges of said partition are the edges of opposite end regions of said partition and said end regions are deformable within said cabinet, said cabinet further comprising tensioning means accessible externally of said cabinet for deforming said end regions of said partition, relative to said front wall.
  • said end regionsof said partition can be deformed by said tensioning means such that the minimum distance between at least one of said end regions and said front wall can be'adjusted to a value in the range from zero to 1.7 times the extent of said minimum distance in the undeformed condition of said end regions.
  • the bracing means may be a rib arranged on the edge of said rear wall, or, may be a T-shaped member.
  • said foam material is at least partly supported by said bracing means.
  • the foam material may be in the form of plates providing several damping walls parallel to internal surfaces of'said walls of the cabinet, and may bearranged to form a plurality of rectangular damping chambers of different sizes and shapes.
  • said plates extend within said cabinet such that edges of said plates are disposed at a distance from the internal surfaces of at least some of said walls of said loudspeaker cabinet.
  • the foam material may be in the form of at least one plate having two edges thereof stuck onto one of said walls of said cabinet such that said at least one foam plate forms a tunnel on said one of said walls of said cabinet.
  • said one of said walls of said cabinet may be the rear wall of the cabinet.
  • said at least one plate may extend within said cabinet such that edges thereof other than said two edgesare disposed at a distance from the internal surfaces of at least some of said walls of said cabinet other than said one of said walls.
  • FIG. 1 shows a typical curve path of a high-power loudspeaker
  • FIG. 2 is a diagrammatic drawing of a straightening of a frequency curve by means of increasing the mass of the diaphragm of a loudspeaker;
  • FIG. 3 is a crosssectional view of a cabinet having an annular gap
  • FIG. 4 is a rear view of the cabinet of FIG. 3 with its rear wall removed;
  • FIG. 5 is a perspective view of an arrangement of foam plates supported by cabinet bracing means
  • FIG. 6 is a perspective view of a tunnel-shaped foam plate
  • FIG. 1 shows the characteristic curve of a highpower loudspeaker having an ultra-light diaphragm, low natural frequency and high natural damping, the loudspeaker being housed in a cabinet relieved of air rigidity by its having an internal gap connecting the interior of the cabinet to the external atmosphere.
  • the full-line curve J is a typical impedance double increase (proportional to sound pressure) of an ultra-light, highly damped diaphragm
  • the broken line curve b is the associated acceleration curve in the bass region: uniform acceleration shows uniform radiation.
  • the natural resonance at about 70 to 80 c/s has disappeared completely beneath the bass humps.
  • FIG. 2 shows diagrammatically a frequency curve correction by artificial increase the mass of the diaphragm of a loudspeaker.
  • the curve a relates to a loudspeaker-having low damping and the curve b to a loudspeaker having stronger damping; the curve c is provided by a diaphragm made artificially heavy.
  • the hatched region therefore shows the power loss caused by the artificial weighting of the diaphragm which, in addition, does not provide any lengthening of the curve towards its bass end, but only a certain flattening and decrease in resonance.
  • FIG. 3 shows a cross-section through a loudspeaker cabinet utilizing the present invention.
  • the front wall 2 having a sound aperture 4
  • a partition 6, also having a sound aperture, (not shown in detail) is mounted internally on spacing means in the form of spacer rollers 5.
  • the loudspeaker 1, the partition 6 and the spacer rollers 5 are fixed on the front wall 2, so that a narrow gap 7 is provided which is in the form of an annulus at the rims of the. sound'apertures in the front wall 2 and in the partition 6.
  • the partition 6 can be deformed by tensioning means in the form of screws 9, so that the cross-sectional area and the volume of the gap 7 are adjustable and a constant acoustic effect can be obtained in series construction.
  • the smallest diameter of the sound aperture 4 in the front wall 2 is a few per cent smaller (e.g. 10 per cent) than its largest diameter and than the aperture in the partition 6.
  • a mixed pressure expulsion chamber 10 is formed, which is supplied both from the front surface of the diaphragm of the loudspeaker l and, through the gap 7, from the rear surface of that diaphragm.
  • the expulsion chamber 10, with strengthened radiation resistance (because it is filled with approximately twice the diaphragm travel volume) and best presence, is the region of contact between the loudspeaker 1 and a hearing room (usually constructed as a pressure chamber) wherein the cabinetisdisposed.
  • the mixing pressure chamber effect can be supplemented by provision of suitable sound aperture linings (for example: bar gratings; slotted holes; metal gratings; etc.) and by increasing the speed transformation (by changing the percentage of the reduction of The sound pressure increase at the region of entry of sound into the room causes filling of the room with sound without so-called hole character of the tonal image. It produces the sound freely in the room.
  • suitable sound aperture linings for example: bar gratings; slotted holes; metal gratings; etc.
  • the gap 7 permits the development of a physiologically pleasing transparent bass tone spectrum with cabinets down to mini-cabinets of 3.6 liter capacity, the gap 7 automatically acting correctly.
  • a bracing'means in the form of a T-shaped member 12 extends from the rear of the loudspeaker 1 to a rear wall 3 of the cabinet.
  • the member 12 rigidly braces the front and rear walls 2 and 3 of the cabinet to one another, the rigid frame of the loudspeaker 1- thereby being maintained substantially rigid and neutral as regards vibration in the cabinet. This is because the amplitudes of vibrations of the front and rear walls 2 and 3 are always in opposition, so that the frame of the loudspeaker I undergoes substantially no vibrations itself, whether by natural impulses, or whether by concurrent vibration of the cabinet.
  • the cabinet contains a number of plates 14 of foam material which act as damping walls for standing waves within the cabinet.
  • the plates 14 may be of a soft foam or hard foam material, such as material known under the trade name Moltopren.
  • Moltopren The arrangement and action of the plates 14 will be described hereinafter, in more detail, with respect to FIG. 5.
  • FIG. 4 is a rear view of the cabinet of FIG. 3 with the rear wall 3, and the foam plates 14, removed.
  • the vertical longitudinal edges of the partition 6 are in acoustically impervious contact with the inside surfaces of a pair of opposite side walls of the cabinet and are shorter than the inside height of the cabinet. There is thus established an acoustic connection between the rear side of the diaphragm of the loudspeaker 1 and the gap 7 (not visible in FIG. 4) by means of windows which are defined by the free edges of the partition 6 and the surfaces of the top and bottom walls of the cabinet.
  • the loudspeaker 1 is secured to the partition 6 by screws 8.
  • the two vertical side walls of the cabinet are mutually braced by the transverse member of the T- shaped bracing member 12.
  • FIG. 5 shows, in its left-hand part, that the T-shaped member 12 serves simultaneously as a support for the vertical ones of the foam plates 14 of FIG. 3, which plates are glued to the transverse member of the member 12.
  • the stem of the member 12 is also provided with plates 14, as shown in the right-hand part of FIG. 5. It is to be understood that the right-hand part of FIG. 5 serves to illustrate an example of a cabinet in which the plates stuck to the stem of the member 12 extend vertically within the cabinet, not horizontally as shown in FIG. 3.
  • the plates 14 may be repeated at each standing wave path, and in fact with different spacings from one another, so that large groups of wave bulges are damped. 4
  • This box structure of damping plates can be compared with an arrangement of baffle plates in a fuel tank truck or a tanker, which permits any movement and any discharge of fuel but which quells dangerous splashing.
  • This splashing is analogous to the phenomenon of standing waves in a loudspeaker cabinet.
  • the frequencies of the standing waves which are to be damped by the plates 14, can be mathematically represented by a sum under a square root of squares of the length multiples of the cabinet dimensions.
  • the standing waves are a complex, infinite group of disturbing frequencies which are perpendicular to the walls of the cabinet and which can be cancelled out by selective damping.
  • the dimensions, adapted to the diaphragms, bring with increased certainty groups of standing wave bulges effectively into the damping regions of the previously described repeated damping plates 14 the edges of which stand freely in the cabinet.
  • the previously used cottonwool filling which damped everything without distinction, is here superseded by an intentional selective damping without the actual purpose of the interior of the cabinet, for frequency formation and shaping, .being disturbed.
  • the high tonal regions remain free, clear and unweakened. Even the frequencies which are above the limit of audibility and their summating and differentiating tones (recognizable by a change in sound with turning of only of this ultra-audible range) are freely radiated and are no longer suppressed in the former cottonwool packing.
  • the foam plates may be tunnel-shaped and adhesively secured to walls of the cabinet by two edges.
  • FIG. 7 shows the rear wall of a larger cabinet which is provided, along its longitudinal center line, with a wooden rib 11 which is on edge and which, on screwing the rear wall on to its cabinet, presses tightly against the back of the loudspeaker and thus braces the front and rear walls of the cabinet as does the T-shaped member of FIG. 3.
  • a tunnel-shaped foam plate 13 is disposed over the rib l l on the rear wall of the cabinet and is adhesively secured to the rear wall by its longitudinal edges. When the rear wall is secured to its cabinet and the rib l1 presses tightly against the loudspeaker, the tunnel-shaped plate 13 is pressed flat at a region which is sandwiched between the back of the loudspeaker and the rib 1 1.
  • Cabinets of different sizes require, for best results for different cabinet sizes, correspondingly different cabinet shapes.
  • a minicabinet should have a rectangular front sound wall, the internal length of which is, at a maximum, three diaphragm diameters, the internal width of the front sound wall being, at a maximum, equal to two diaphragm diameters. Also, for cabinets of capacities from 25 to liters, the depth dimension (from front wall to rear wall) is to be the predominate. A ratio of 3:4 would be suitable for the width to length ratio of the front wall of such a cabinet, a ratio of 1:1 would be unsuitable.
  • a high-power loudspeaker as is below described, can be installed to advantage both in the cabinet of the example just considered and in a mini-cabinet.
  • a suitable, high-power, loudspeaker is one having a lowest possible natural resonance (at the present time, this can go down to 5 c/s).
  • the loudspeaker has: an extremely low restoring force, limited solely by guarantee of the rest position and gravitational force; large movements in homogeneous and strong magnetic field; high pneumatic and electro-magnetic attenuation in a broad, low, gap; small ohmic values with high impedance, so that two merging bass humps cause a raising of the sound pressure curve.
  • the lower loudspeaker frequency 1" can be proportional to the natural frequency of the cabinet in which it is installed, multiplied by a root value, in which appears the reciprocal value of the cabinet volume.
  • the basis is the dimensions of a conventional cabinet of normal size, and namely the diaphragm travel volumes (for a diaphragm travel of 1 mm.) which are proportional to the diaphragm surfaces and are the basis for the sound pressure.
  • a diaphragm diameter of about 7.5 cm is to be used.
  • the front wall of the mini-cabinet (maximum dimensions 3 D times 2 D) will consequently be approximately 21 times 12 cm to 15 cm.
  • the largest possible depth desirable for the cabinet is obtained from the cabinet volume of 3.6 liters as about 19 cm (with 11 to 12 cm front width).
  • This rough planning of the dimensions is finely tuned to the maximum readiness for formation of bass humps of the loudspeaker system being used and the best f,,.
  • the adjustable slot width 7 takes over as ohmic brake the measurement of the air rigidity.
  • Small, closed, cabinets, with their high air rigidity make a constant diaphragm acceleration impossible.
  • the internal air mass of the cabinet is unstifiened to conform to the bass and the slot volume is varied.
  • optimum high power loudspeaker systems with ultra-light diaphragms or in curvi-linear form or consisting of titanium or the like can be used in these cabinets and these diaphragms, also with the small cabinets, still provide their readiness for utilizing their two bass humps for a desired raising of the bass and for suppressing the f,,.
  • intensification of the sound radiation is obtained by a combination of the following features: by the provision ,of an annular slot 7 in front of the loudspeaker diaphragm, of which the acoustic energy enters a mixing pressure chamber 10; by the damping of the standing waves without appreciable loss of damping of the acoustic energy; by the full utilization of the air masses vibrating in the cabinet, on the basis of the vibrationfree bracing of the cabinet; and, finally, by the inertial attachment of the loudspeaker.
  • mini-cabinets giving good results, can be made having capacities as small as the capacities of violin bodies.
  • the minicabinet that has been described hereinbefore is a compact cabinet having a window but, except with the large constructions, it is not a reflex cabinet in the conventional sense.
  • the invention is based on the two basic principles (compact and reflex construction), which have been described hereinbefore, and follows the principle; as far as possible mass-free elasticities and as far as possible non-elastic masses.
  • a loudspeaker cabinet comprising:
  • a partition arrangedbehind said front wall, said partition defining a further sound aperture and having edges which bear acoustically and tightly against an opposite pair of said side walls, said edges being shorter in length than said opposite pair of said walls such that other edges of said partition are free within said cabinet;
  • spacing means arranged between said front wall and said partition such that said front wall and said partition define an annular gap about the rims of said sound apertures;
  • bracing means bracing a pair of opposite ones of said walls
  • foam material disposed within said cabinet to define at least one damp g wall and at least one damping chamber within said cabinet.
  • a loudspeaker cabinet as claimed in claim 1 wherein said cabinet has a capacity of less than 26 liters and has a greater dimension between said front and rear walls than between said opposite pair of said side walls.
  • a loudspeaker cabinet as wherein said bracing on said rear wall.
  • Frcnt Page change the inventor- 's surname at both occurrences from "Goeskel" to--Goeck el--.

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)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
US141665A 1970-05-08 1971-05-10 Loudspeaker box for a preferably dynamic loudspeaker Expired - Lifetime US3680658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702022612 DE2022612C (de) 1970-05-08 Lautsprecherbox für einen, vorzugsweise dynamischen, Lautsprecher

Publications (1)

Publication Number Publication Date
US3680658A true US3680658A (en) 1972-08-01

Family

ID=5770638

Family Applications (1)

Application Number Title Priority Date Filing Date
US141665A Expired - Lifetime US3680658A (en) 1970-05-08 1971-05-10 Loudspeaker box for a preferably dynamic loudspeaker

Country Status (10)

Country Link
US (1) US3680658A (fr)
AT (1) AT305402B (fr)
BE (1) BE766852A (fr)
CH (1) CH539373A (fr)
FR (1) FR2088430B1 (fr)
GB (1) GB1346083A (fr)
LU (1) LU63061A1 (fr)
NL (1) NL7106269A (fr)
NO (1) NO129655B (fr)
SE (1) SE366897B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5055043U (fr) * 1973-09-14 1975-05-24
FR2532140A1 (fr) * 1982-08-19 1984-02-24 Audioplay Hifi Akustik Gmbh Coffret de haut-parleur
EP0267650A2 (fr) * 1986-11-07 1988-05-18 Carver Corporation Appareil haut-parleur et méthode
US6324292B1 (en) * 1998-10-14 2001-11-27 Pioneer Corporation Speaker apparatus
US20060231327A1 (en) * 2005-04-15 2006-10-19 Stiles Enrique M Loudspeaker enclosure with damping material laminated within internal shearing brace
US20100034411A1 (en) * 2008-08-08 2010-02-11 Nokia Corporation Apparatus incorporating an adsorbent material, and methods of making same
US20100163335A1 (en) * 2008-12-27 2010-07-01 Peigen Jiang Loudspeaker enclosure
US8807269B1 (en) * 2012-01-09 2014-08-19 Brian Lucy Loudspeaker enclosure
CN112188354A (zh) * 2019-07-01 2021-01-05 杨国安 声音放大装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618284B1 (fr) * 1987-07-16 1989-12-29 Fenestraz Louis Jean Enceinte acoustique a haute definition musicale.
GB201902360D0 (en) 2019-02-21 2019-04-10 Pss Belgium Nv Loudspeaker system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2694463A (en) * 1952-04-07 1954-11-16 Robbins Frank Acoustic system for loud-speakers
US2900040A (en) * 1955-09-12 1959-08-18 Muter Company Loudspeaker system
US3082839A (en) * 1959-03-27 1963-03-26 Joseph E Whitcas High-fidelity loudspeaker system
US3104730A (en) * 1963-09-24 Speaker enclosure
US3135349A (en) * 1962-04-02 1964-06-02 Uolevi L Lahti Loudspeaker
US3247926A (en) * 1964-09-14 1966-04-26 Edwin G Warman Loud-speaker enclosure
US3412824A (en) * 1967-02-17 1968-11-26 James C. Armstrong Speaker cabinet enclosure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3104730A (en) * 1963-09-24 Speaker enclosure
US2694463A (en) * 1952-04-07 1954-11-16 Robbins Frank Acoustic system for loud-speakers
US2900040A (en) * 1955-09-12 1959-08-18 Muter Company Loudspeaker system
US3082839A (en) * 1959-03-27 1963-03-26 Joseph E Whitcas High-fidelity loudspeaker system
US3135349A (en) * 1962-04-02 1964-06-02 Uolevi L Lahti Loudspeaker
US3247926A (en) * 1964-09-14 1966-04-26 Edwin G Warman Loud-speaker enclosure
US3412824A (en) * 1967-02-17 1968-11-26 James C. Armstrong Speaker cabinet enclosure

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5055043U (fr) * 1973-09-14 1975-05-24
JPS5611492Y2 (fr) * 1973-09-14 1981-03-16
FR2532140A1 (fr) * 1982-08-19 1984-02-24 Audioplay Hifi Akustik Gmbh Coffret de haut-parleur
EP0267650A2 (fr) * 1986-11-07 1988-05-18 Carver Corporation Appareil haut-parleur et méthode
EP0267650A3 (fr) * 1986-11-07 1990-04-25 Carver Corporation Appareil haut-parleur et méthode
US6324292B1 (en) * 1998-10-14 2001-11-27 Pioneer Corporation Speaker apparatus
US20060231327A1 (en) * 2005-04-15 2006-10-19 Stiles Enrique M Loudspeaker enclosure with damping material laminated within internal shearing brace
US7270215B2 (en) * 2005-04-15 2007-09-18 Step Technologies Inc. Loudspeaker enclosure with damping material laminated within internal shearing brace
US20100034411A1 (en) * 2008-08-08 2010-02-11 Nokia Corporation Apparatus incorporating an adsorbent material, and methods of making same
US8630435B2 (en) * 2008-08-08 2014-01-14 Nokia Corporation Apparatus incorporating an adsorbent material, and methods of making same
US20100163335A1 (en) * 2008-12-27 2010-07-01 Peigen Jiang Loudspeaker enclosure
US8807269B1 (en) * 2012-01-09 2014-08-19 Brian Lucy Loudspeaker enclosure
CN112188354A (zh) * 2019-07-01 2021-01-05 杨国安 声音放大装置

Also Published As

Publication number Publication date
NO129655B (fr) 1974-05-06
BE766852A (fr) 1971-10-01
DE2022612B2 (de) 1972-03-02
FR2088430B1 (fr) 1974-05-31
GB1346083A (en) 1974-02-06
FR2088430A1 (fr) 1972-01-07
SE366897B (fr) 1974-05-06
NL7106269A (fr) 1971-11-10
AT305402B (de) 1973-02-26
CH539373A (de) 1973-07-15
DE2022612A1 (de) 1971-11-25
LU63061A1 (fr) 1971-08-26

Similar Documents

Publication Publication Date Title
US5105905A (en) Co-linear loudspeaker system
US4298087A (en) Unidirectional speaker enclosure
EP0429121B1 (fr) Système de haut-parleurs comportant un résonateur de Helmholtz couplé à un tube acoustique
JP3410206B2 (ja) スピーカ装置
US4157741A (en) Phase plug
US5111905A (en) Speaker enclosure
US3680658A (en) Loudspeaker box for a preferably dynamic loudspeaker
US1965830A (en) Acoustic device
US7614479B2 (en) Sound enhancement module
US3923124A (en) Back loaded folded corner horn speaker
US3944757A (en) High-fidelity moving-coil loudspeaker
JPH07131879A (ja) 音波導管スピーカシステム
US5012889A (en) Speaker enclosure
US2694463A (en) Acoustic system for loud-speakers
US6062338A (en) Loud speaker enclosure
US3247926A (en) Loud-speaker enclosure
US5513270A (en) Speaker box
US4373606A (en) Loudspeaker enclosure and process for generating sound radiation
US4482026A (en) Loudspeaker enclosure
US2816619A (en) Acoustic transducers
US3777844A (en) Adjustable speaker cabinet
US2866514A (en) Corrective loud speaker enclosure
US4251687A (en) Stereophonic sound reproducing system
EP0456416A2 (fr) Système de haut-parleur
US11849295B2 (en) Flat loudspeaker