EP3596938B1 - One-piece device for a powered speaker enclosure - Google Patents

One-piece device for a powered speaker enclosure Download PDF

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Publication number
EP3596938B1
EP3596938B1 EP18714556.0A EP18714556A EP3596938B1 EP 3596938 B1 EP3596938 B1 EP 3596938B1 EP 18714556 A EP18714556 A EP 18714556A EP 3596938 B1 EP3596938 B1 EP 3596938B1
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EP
European Patent Office
Prior art keywords
loudspeakers
loudspeaker
speaker according
speaker
possibly
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EP18714556.0A
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German (de)
French (fr)
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EP3596938A1 (en
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Timothée Cagniard
Thierry Cagniard
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Cc Lab
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Cc Lab
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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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/028—Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H04R3/14—Cross-over networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers

Definitions

  • the present invention relates to a one-piece amplified acoustic enclosure device.
  • the amplifier/speaker combination available does not generally allow this objective to be achieved either for lack of means: amplifier power (or batteries) too low, distortion rate in the important bass frequencies at high level, all coupled with speakers that are also too small.
  • Integrated servo systems make it possible to control the elongation of the membranes of the bass loudspeaker or, as described in the patent US 6,353,670 (GASNER DONALD R ), harmful resonances measured occasionally at certain frequencies inside the loudspeakers themselves. While increasing or reducing punctually the extent of the displacement of their membranes and thereby the sound level of the speakers in the low register, we manage to control these same displacements by limiting them at high power when their voice coil deviates too much of its magnetic field or when the sound level at certain frequencies causes undesirable internal resonance effects, so that any distortion or sound coloration can be contained permanently, whatever the listening level.
  • this is the passive radiator, which multiplies by two the radiation of the loudspeaker in the lower end of the sound spectrum and thus noticeably increases the sound level in this frequency range. But which also does not allow a high sound level to be supported without distortion.
  • this is a solution that makes it possible to reconcile these different advantages without their main disadvantages, described above.
  • the two loudspeakers control their possible excessive elongations and thereby allow, at an equivalent sound power level, to significantly reduce the distortion observed in the low frequencies. compared to that of a conventional loudspeaker of equivalent size.
  • a better sound level is also obtained in the low register than with a conventional closed load while maintaining, as for a vented speaker, a good level bandwidth in the bottom of the sound spectrum while remaining compatible with a resistance in power without distortion.
  • the loudspeakers of such a device are intended to be connected to a separate multi-purpose amplifier.
  • the rear loudspeaker connected to the audio output of the external amplifier, is connected with the front loudspeaker according to a parallel electrical diagram.
  • the front loudspeaker when it is relayed in frequencies towards the top of the sound spectrum only by tweeters, is responsible for reproducing in this classic configuration scheme the low register as well as the mid/high register.
  • the so-called rear loudspeaker whose cone is directed towards the rear of the front loudspeaker membrane and which is therefore not filtered separately, logically rises in frequency like the front loudspeaker, producing in the direction of the rear of the membrane of the latter, especially beyond 120 Hz, interference in the form of standing waves harmful to sound reproduction and sound clarity in the midrange of the entire system.
  • the two loudspeakers operate strictly in piston as well as in phase.
  • the pneumatic coupling of the two loudspeakers makes it possible to significantly reduce the overall distortion of the loudspeaker in the low frequencies, by reducing in this frequency range the travel of the two membranes at high power.
  • this threshold 120 - 150 Hz
  • the front loudspeaker which no longer functions as a piston, is out of phase with respect to the rear loudspeaker, thereby causing a level drop.
  • the front loudspeaker which has a small volume of air at the rear of its membrane, intrinsically resonates at a frequency significantly higher than that of the rear loudspeaker, which prevents it, while by consuming power unnecessarily, to be electrically active in the extreme bass, unlike the rear loudspeaker.
  • the double partition leads to an obligatory complication of the traditional cabinet-making scheme, to a larger and less watertight volume as well as to a complication of the assembly labor dedicated to this second internal loudspeaker.
  • the device that is the subject of the present invention while adopting this same arrangement of loudspeakers in tandem, aims to overcome all of the various disadvantages described above, as well as seizing the opportunity offered by recent technical possibilities in terms of powerful, compact and high-performance amplifications.
  • This device consists of a front loudspeaker (1) and a rear loudspeaker (2), mechanically coupled together via a small volume of air itself preferably delimited by a room link forming a watertight bulkhead (4) and connecting these two loudspeakers.
  • This connecting piece can be of complex shape, adapted to the geometry of said loudspeakers and manufactured possibly using injection, thermoforming or 3D printing techniques.
  • a vent (5) ensures the pneumatic connection between the outside air and the internal part of the enclosure located outside this sealed volume; a second vent (5') can also be provided as is apparent from the Figure 3 .
  • the rear loudspeaker (2) intrinsically has a lower resonance frequency than that of the front loudspeaker (1), the latter being loaded at the rear of its membrane by a minimum volume of air; but it can, according to one embodiment, also be designed for this purpose.
  • the device according to the invention also comprises an internal amplifier, preferably of class D, integrated into the enclosure. It consists of at least two channels (3) and (3') connected separately to each loudspeaker (1) and (2).
  • Each of these two amplified central channels is calibrated in order to allow a precise and differentiated modulation of their frequency ranges concerning the characteristics of each loudspeaker (1) and (2) and, where appropriate, of their respective sound levels.
  • This filtering makes it possible in particular, for example, and in this embodiment, to gradually reduce the level of the rear loudspeaker (2) above and from 70 Hz, as illustrated in the diagram of the Figure 5 , in order to avoid, as explained above, any negative interference from the rear loudspeaker (2) to the front loudspeaker (1).
  • each amplification channel (3), (3') can be attenuated in a differentiated manner by at least -6db below or around each resonance frequency of the two loudspeakers (1 ) and (2).
  • the device according to the invention allows an optimization of the feedback rate of the amplifier.
  • An external amplifier should be versatile and its feedback rate is high (usually around 1 volt for a gain of 2000).
  • By lowering the feedback rate of a standard amplifier it would be possible to obtain with traditional loudspeakers a widening of their bandwidth, but the loudspeakers of these loudspeakers would not fail to quickly saturate, distort, then deteriorate.
  • the device according to the invention makes it possible to circumvent this problem and to reduce the feedback rate of the dedicated amplifier for gain values substantially less than 1000 for 1 volt at the level of the channels (3), (3') while keeping speaker distortion low and sound more natural.
  • Two or four additional amplified channels, if any, will also make it possible to separately supply the loudspeakers specialized in the high frequencies (6) and (6') concerning the treble and possibly the midrange, as provided in a variant embodiment of the present invention.
  • the treble loudspeakers (6) and (6') and possibly midrange loudspeakers will be supplied separately by differentiated amplifier channels.
  • the variant of the Figure 1 relates to a device in which the two loudspeakers (1) and (2) are schematically represented inside an amplified one-piece enclosure of conventional architecture and equipped with a single vent (5) facing the rear of the 'pregnant ; to the Figure 2 , this vent (5) faces the front of said enclosure.
  • the variant illustrated in Figure 3 relates to a device in which the two loudspeakers (1) and (2) are schematically represented inside a one-piece enclosure amplified, equipped with a treble distribution system via the loudspeakers (6) and (6'), as well as two vents (5) and (5') facing the front of said enclosure.
  • an internal amplifier comprising at least two independent channels (3) (3'), the sound level of each channel of which is filtered and modulated in order to avoid any negative interaction between the two loudspeakers (1) and (2) and so that it can be raised significantly (by at least + 3 db) below frequencies situated around 200 Hz (low frequency register).
  • the power level of the channel which supplies the rear loudspeaker (2) within a frequency range situated between the resonance frequency of this loudspeaker (2) and possibly up to 200 Hz , is occasionally raised by at least +3db with respect to the average amplification power level of the loudspeakers.
  • These distinct amplification channels (3) and (3') each have their specific frequency band so that the frequency response curve of the rear loudspeaker (2) is progressively attenuated by at least 3db from and above a frequency range between 60 Hz and 120 Hz.
  • Each amplification channel (3), (3') is gradually attenuated and starting from each resonance frequency of the loudspeakers (1), (2).
  • the curve of the Figure 6 is the frequency response curve, after corrections, of the rear loudspeaker (2), of the front loudspeaker (1) as well as the representation (in dotted line) at the junction of these of their resulting curve.
  • the assembly can also incorporate loudspeakers (6) and (6') responsible for reproducing the high frequencies and possibly the mids, which can thus be placed either according to conventional loudspeaker diagrams ( Figure 1 and Figure 2 ) or possibly according to more complex schemes ( Figure 3 ).
  • the loudspeakers (6) and (6') responsible for restoring the high frequencies have been advantageously inclined upwards and positioned in an opposite direction from the loudspeakers (1) and (2) in order to benefit more advantageously to the set of a spatial effect.

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

Description

La présente invention concerne un dispositif monobloc d'enceinte acoustique amplifiée.The present invention relates to a one-piece amplified acoustic enclosure device.

Comme n'importe qui peut le constater avec son téléphone, un petit hautparleur est incapable de reproduire les fréquences graves. S'agissant plus généralement de produits audio compacts, la combinaison amplificateur/haut-parleur dont on dispose ne permet pas non plus généralement d'atteindre cet objectif faute de moyens : puissance d'amplificateur (ou des batteries) trop faible, taux de distorsion dans les fréquences graves important à niveau élevé, le tout couplé à des haut-parleurs là aussi de trop petite taille.As anyone can tell with their phone, a small speaker is incapable of reproducing bass frequencies. With more generally compact audio products, the amplifier/speaker combination available does not generally allow this objective to be achieved either for lack of means: amplifier power (or batteries) too low, distortion rate in the important bass frequencies at high level, all coupled with speakers that are also too small.

Ainsi le marché de l'audio depuis des décennies se partage globalement en deux avec d'une part, des systèmes de haute-fidélité encombrants et chers et de l'autre des systèmes compacts de qualité médiocre ne permettant pas, entre autres, de faire coexister une écoute de qualité dans les fréquences graves avec un niveau sonore élevé.Thus, the audio market for decades has been globally divided in two with, on the one hand, bulky and expensive high-fidelity systems and, on the other, mediocre quality compact systems that do not allow, among other things, to make coexist quality listening in the bass frequencies with a high sound level.

Il existe des solutions techniques permettant de compenser l'absence de volume des enceintes acoustiques tout en améliorant leurs performances acoustiques globales.There are technical solutions to compensate for the lack of volume of the loudspeakers while improving their overall acoustic performance.

Des systèmes d'asservissements intégrés permettent en effet de contrôler les élongations des membranes du haut-parleur de graves ou, comme le décrit le brevet US 6 353 670 (GASNER DONALD R ), les résonnances néfastes mesurées ponctuellement à certaines fréquences à l'intérieur des enceintes acoustiques elles-mêmes. Tout en accroissant ou en réduisant ponctuellement l'ampleur du déplacement de leurs membranes et par là le niveau sonore des enceintes dans le registre grave, on parvient à contrôler ces mêmes déplacements en limitant ceux-ci à forte puissance lorsque leur bobine mobile s'écarte trop de son champ magnétique ou lorsque le niveau sonore à certaines fréquences entraine des effets de résonnances internes indésirables, de telle manière à ce que toute distorsion ou coloration sonore puisse être contenue en permanence, quel que soit le niveau d'écoute. Ces systèmes, qui nécessitent des circuits électroniques et des capteurs spécifiques souvent complexes, comme il ressort du brevet US 6 353 670 précité, ainsi que, si possible une amplification d'autant plus puissante que la taille des haut-parleurs diminue, sont réservés à des réalisations haut de gamme.Integrated servo systems make it possible to control the elongation of the membranes of the bass loudspeaker or, as described in the patent US 6,353,670 (GASNER DONALD R ), harmful resonances measured occasionally at certain frequencies inside the loudspeakers themselves. While increasing or reducing punctually the extent of the displacement of their membranes and thereby the sound level of the speakers in the low register, we manage to control these same displacements by limiting them at high power when their voice coil deviates too much of its magnetic field or when the sound level at certain frequencies causes undesirable internal resonance effects, so that any distortion or sound coloration can be contained permanently, whatever the listening level. These systems, which require specific electronic circuits and often complex sensors, as shown in the patent US 6,353,670 mentioned above, as well as, if possible, an amplification all the more powerful as the size of the loudspeakers decreases, are reserved for high-end productions.

II existe en outre, compte tenu de la simplification et de la miniaturisation nécessaires des enceintes acoustiques au cours de ces dernières année, des systèmes permettant, à partir d'amplificateurs multicanaux différenciés, d'améliorer la diffusion stéréophonique comme cela est illustré par exemple dans la demande de brevet US 2008285762 (IWAMOTO KEIICHI ), à partir d'une source monobloc, en permettant de contrôler notamment de façon active par interférométrie l'effet stéréophonique. Mais sans pour autant traiter le problème posé ci-dessus, à savoir l'amélioration de la reproduction des fréquences graves à l'intérieur d'un faible volume d'enceintes.In addition, given the necessary simplification and miniaturization of loudspeakers in recent years, there are systems which make it possible, from differentiated multi-channel amplifiers, to improve stereophonic diffusion, as is illustrated for example in the patent application US 2008285762 (IWAMOTO KEIICHI ), from a one-piece source, making it possible in particular to actively control the stereophonic effect by interferometry. But without addressing the problem posed above, namely the improvement of the reproduction of bass frequencies inside a low volume of loudspeakers.

Pour l'essentiel, et de façon générale, au niveau de la reproduction du registre grave, de nombreux systèmes, généralement plus simples, d'enceintes compactes sont développés en faisant appel à des haut-parleurs à grande élongation placés en charge close. Cette technique, qui permet d'accepter une certaine puissance théorique ne permet pas, néanmoins, d'offrir, tout particulièrement avec des haut-parleurs de faible diamètre, un rendement acoustique suffisant étant donné la chute importante de niveau sonore constatée dans les fréquences graves en utilisant cette technique ; le schéma de la Figure 4 illustre ce qui précède. Il est aussi possible et très courant de faire appel à des systèmes de haut-parleurs chargés par un évent. Ces systèmes, comme on peut le constater comparativement sur le même schéma de la Figure 4, permettent un meilleur rendement acoustique dans les fréquences graves. Compte tenu des élongations importantes du haut-parleur de graves concerné - sauf lorsque celui-ci est de grand diamètre - qui ne sont plus maîtrisées par la compression du volume d'air clos placé à l'arrière de la membrane de celui-ci comme sur une enceinte close, on constate une élévation importante de la distorsion mesurée à forte puissance dans le registre grave.Essentially, and in a general way, at the level of the reproduction of the low register, many systems, generally simpler, of compact loudspeakers are developed by making use of loudspeakers with great elongation placed in a closed load. This technique, which makes it possible to accept a certain theoretical power, does not, however, make it possible to offer, particularly with small diameter loudspeakers, sufficient acoustic performance given the significant drop in sound level observed in the low frequencies. using this technique; the diagram of the Figure 4 illustrates the above. It is also possible and very common to use vented speaker systems. These systems, as can be seen comparatively on the same diagram of the Figure 4 , allow better acoustic performance in the low frequencies. Given the significant elongations of the bass speaker concerned - except when the latter is of large diameter - which are no longer controlled by the compression of the volume of closed air placed at the rear of the latter's membrane as on a closed enclosure, a significant rise in the distortion measured at high power is observed in the low register.

II en est de même avec un autre type de technologie qui s'est largement répandue au cours de ces dernières années, notamment pour la réalisation d'enceintes miniatures sur batteries : il s'agit du radiateur passif, qui multiplie par deux le rayonnement du haut-parleur dans le bas du spectre sonore et augmente ainsi de façon sensible le niveau sonore dans cette plage de fréquences. Mais qui ne permet pas non plus de supporter sans distorsion un niveau sonore important. Il existe cependant une solution permettant de concilier ces différents avantages sans leurs principaux inconvénients, décrits ci-dessus.It is the same with another type of technology which has become widely used in recent years, in particular for the production of miniature speakers on batteries: this is the passive radiator, which multiplies by two the radiation of the loudspeaker in the lower end of the sound spectrum and thus noticeably increases the sound level in this frequency range. But which also does not allow a high sound level to be supported without distortion. However, there is a solution that makes it possible to reconcile these different advantages without their main disadvantages, described above.

Une telle solution est décrite dans le brevet français FR 2 343 388 (SIARE ). Ce brevet décrit un dispositif qui consiste à placer deux haut-parleurs l'un derrière l'autre. Un évent reliant de façon pneumatiquement étanche l'extérieur de l'enceinte à son volume arrière interne et passant au travers d'un baffle parallèle à la façade, ajouré et supportant le deuxième haut-parleur, permet de récupérer l'onde arrière émise par celui-ci.Such a solution is described in the French patent FR 2 343 388 (SIARE ). This patent describes a device which consists in placing two loudspeakers one behind the other. A vent connecting in a pneumatically sealed manner the outside of the enclosure to its internal rear volume and passing through a baffle parallel to the facade, perforated and supporting the second loudspeaker, makes it possible to recover the rear wave emitted by this one.

Grâce à l'action mécanique générée par le volume d'air compris entre eux, les deux haut-parleurs maîtrisent leurs élongations excessives éventuelles et par là, permettent, à niveau de puissance acoustique équivalente, de diminuer notablement la distorsion constatée dans les fréquences graves par rapport à celle d'une enceinte acoustique classique de taille équivalente. On obtient par ailleurs un meilleur niveau sonore dans le registre grave qu'avec une charge close classique tout en conservant, comme pour une enceinte à évent, une bande passante de bon niveau dans le bas du spectre sonore tout en restant compatible avec une tenue en puissance sans distorsion.Thanks to the mechanical action generated by the volume of air between them, the two loudspeakers control their possible excessive elongations and thereby allow, at an equivalent sound power level, to significantly reduce the distortion observed in the low frequencies. compared to that of a conventional loudspeaker of equivalent size. A better sound level is also obtained in the low register than with a conventional closed load while maintaining, as for a vented speaker, a good level bandwidth in the bottom of the sound spectrum while remaining compatible with a resistance in power without distortion.

Cette technique, qui concernait par définition des enceintes traditionnelles équipées de filtres passifs, possède toutefois des inconvénients.This technique, which by definition concerned traditional loudspeakers equipped with passive filters, does however have drawbacks.

Les haut-parleurs d'un tel dispositif sont destinés à être connectés à un amplificateur séparé polyvalent. Le haut-parleur arrière, relié à la sortie audio de l'amplificateur externe est raccordé avec le haut-parleur avant selon un schéma électrique parallèle. Le haut-parleur avant, lorsqu'il n'est relayé en fréquences vers le haut du spectre sonore que par des tweeters, est chargé de reproduire dans ce schéma classique de configuration le registre grave ainsi que le registre médium/aigu. Le dit haut-parleur arrière dont le cône est dirigé vers l'arrière de la membrane du haut-parleur avant et qui n'est donc pas filtré séparément, monte logiquement en fréquences comme le haut- parleur avant, produisant en direction de l'arrière de la membrane de celui-ci, tout particulièrement au-delà de 120 Hz, des interférences sous forme d'ondes stationnaires nuisibles à la restitution sonore et à la clarté sonore dans le registre médium de l'ensemble du système.The loudspeakers of such a device are intended to be connected to a separate multi-purpose amplifier. The rear loudspeaker, connected to the audio output of the external amplifier, is connected with the front loudspeaker according to a parallel electrical diagram. The front loudspeaker, when it is relayed in frequencies towards the top of the sound spectrum only by tweeters, is responsible for reproducing in this classic configuration scheme the low register as well as the mid/high register. The so-called rear loudspeaker, whose cone is directed towards the rear of the front loudspeaker membrane and which is therefore not filtered separately, logically rises in frequency like the front loudspeaker, producing in the direction of the rear of the membrane of the latter, especially beyond 120 Hz, interference in the form of standing waves harmful to sound reproduction and sound clarity in the midrange of the entire system.

Par ailleurs et inversement, sur toute la plage de fréquences en dessous de 120 Hz, les deux haut-parleurs fonctionnent rigoureusement en piston ainsi qu'en phase. De ce fait le couplage pneumatique des deux haut-parleurs permet de diminuer significativement la distorsion globale de l'enceinte dans les fréquences graves, en réduisant dans cette plage de fréquences le débattement des deux membranes à forte puissance. Par contre, au-delà de ce seuil (120 - 150 Hz) le haut-parleur avant, qui ne fonctionne plus en piston, se déphase par rapport au haut-parleur arrière, provoquant de ce fait sur la bande de fréquences bas médium une chute de niveau. Le haut-parleur avant, enfin, qui dispose à l'arrière de sa membrane d'un volume d'air peu important, résonne intrinsèquement à une fréquence sensiblement plus haute que celle du haut-parleur arrière, ce qui l'empêche, tout en consommant inutilement de la puissance, d'être électriquement actif dans l'extrême grave, à la différence du haut-parleur arrière. Enfin, la double cloison aboutit à une complication obligatoire du schéma d'ébénisterie traditionnel, à un volume plus important et moins étanche ainsi qu'à une complication de la main d'œuvre de montage dédiée à ce deuxième haut-parleur interne.Moreover, and conversely, over the entire frequency range below 120 Hz, the two loudspeakers operate strictly in piston as well as in phase. As a result, the pneumatic coupling of the two loudspeakers makes it possible to significantly reduce the overall distortion of the loudspeaker in the low frequencies, by reducing in this frequency range the travel of the two membranes at high power. On the other hand, beyond this threshold (120 - 150 Hz) the front loudspeaker, which no longer functions as a piston, is out of phase with respect to the rear loudspeaker, thereby causing a level drop. Finally, the front loudspeaker, which has a small volume of air at the rear of its membrane, intrinsically resonates at a frequency significantly higher than that of the rear loudspeaker, which prevents it, while by consuming power unnecessarily, to be electrically active in the extreme bass, unlike the rear loudspeaker. Finally, the double partition leads to an obligatory complication of the traditional cabinet-making scheme, to a larger and less watertight volume as well as to a complication of the assembly labor dedicated to this second internal loudspeaker.

Le dispositif objet de la présente invention, tout en adoptant ce même schéma d'implantation de haut-parleurs en tandem, se propose pour objectif de pallier l'ensemble des différents inconvénients décrits ci-dessus, ainsi que de saisir l'opportunité offerte par les récentes possibilités techniques en matière d'amplifications puissantes, compactes et performantes.The device that is the subject of the present invention, while adopting this same arrangement of loudspeakers in tandem, aims to overcome all of the various disadvantages described above, as well as seizing the opportunity offered by recent technical possibilities in terms of powerful, compact and high-performance amplifications.

De façon plus précise, le dispositif selon l'invention est une enceinte acoustique amplifiée du type comprenant :

  • ∗ deux haut-parleurs, l'un situé en façade, destiné à reproduire les fréquences médiums et graves, et l'autre, placé à proximité et à l'arrière de celui-ci destiné à reproduire les fréquences graves et reliés pneumatiquement l'un à l'autre par un compartiment étanche,
  • ∗ au moins un évent ne communiquant pas pneumatiquement avec ce compartiment étanche et reliant la partie intérieure de l'enceinte à l'extérieur de celle-ci,
  • ladite enceinte se caractérisant en ce que chacun de ces deux haut-parleurs (1) et (2) est alimenté par des canaux d'amplification distincts (3) et (3') et possédant chacun leur bande de fréquence spécifique de manière à ce que la courbe de réponse en fréquences du haut- parleur arrière (2) soit progressivement atténuée d'au moins 3db à partir et au-dessus d'une plage de fréquences située entre 60 Hz et 120 Hz.
More specifically, the device according to the invention is an amplified acoustic enclosure of the type comprising:
  • ∗ two loudspeakers, one located on the front, intended to reproduce the midrange and bass frequencies, and the other, placed near and to the rear of it, intended to reproduce the bass frequencies and pneumatically connected to the to each other through a watertight compartment,
  • ∗ at least one vent not communicating pneumatically with this sealed compartment and connecting the inner part of the containment to the outside thereof,
  • said enclosure being characterized in that each of these two loudspeakers (1) and (2) is powered by distinct amplification channels (3) and (3') and each possessing their specific frequency band so that that the frequency response curve of the rear loudspeaker (2) is gradually attenuated by at least 3db from and above a frequency range situated between 60 Hz and 120 Hz.

Les caractéristiques du dispositif selon l'invention ressortiront mieux à la lecture de la description qui va suivre en faisant référence aux figures suivantes données à titre indicatif et nullement limitatif parmi lesquelles :

  • la Figure 1 est une vue en coupe transversale du dispositif selon un premier mode de réalisation de l'invention,
  • la Figure 2 est une variante vue en plan du dispositif illustré à la Figure 1 ,
  • la Figure 3 est une vue en plan du dispositif selon un autre mode de réalisation de l'invention,
  • la Figure 4 montre des courbes de réponse en fréquences graves dans le cas d'une enceinte à évent et dans le cas d'une enceinte close,
  • la Figure 5 montre une courbe de réponse en fréquences de l'amplification du haut-parleur arrière,
  • la Figure 6 montre une courbe de réponse en fréquence, après corrections, du haut-parleur arrière, du haut-parleur avant ainsi que la représentation (en pointillé) à la jonction de celles-ci de leur courbe résultante.
The characteristics of the device according to the invention will emerge better on reading the following description with reference to the following figures given by way of indication and in no way limiting, among which:
  • the Figure 1 is a cross-sectional view of the device according to a first embodiment of the invention,
  • the Figure 2 is a plan view variant of the device illustrated in Figure 1 ,
  • the Figure 3 is a plan view of the device according to another embodiment of the invention,
  • the Figure 4 shows low frequency response curves in the case of a vented enclosure and in the case of a closed enclosure,
  • the Figure 5 shows a frequency response curve of the rear speaker amplification,
  • the Figure 6 shows a frequency response curve, after corrections, of the rear loudspeaker, of the front loudspeaker as well as the representation (in dotted line) at the junction of these of their resulting curve.

Ce dispositif selon l'invention, référence étant faite aux Figures 1, 2 et 3, est constitué d'un haut-parleur de façade (1) et d'un haut-parleur arrière (2), couplés mécaniquement entre eux par l'intermédiaire d'un faible volume d'air lui-même délimité préférablement par une pièce de liaison formant une cloison étanche (4) et reliant ces deux haut-parleurs. Cette pièce de liaison peut être de forme complexe, adaptée à la géométrie des dits haut-parleurs et fabriquée en utilisant possiblement des techniques d'injection, de thermoformage ou d'impression 3D. Un évent (5) assure la liaison pneumatique entre l'air extérieur et la partie interne de l'enceinte située à l'extérieur de ce volume étanche ; un deuxième évent (5') peut également être prévu ainsi qu'il ressort de la Figure 3. Ce ou ces évents permettent de récupérer l'énergie acoustique produite par le haut-parleur arrière (2) et peut déboucher soit vers l'avant de l'enceinte (Figures 2 et 3) soit vers l'arrière de celle-ci (Figure 1). Le haut- parleur arrière (2) possède intrinsèquement une fréquence de résonnance plus basse que celle du haut-parleur avant (1), ce dernier étant chargé à l'arrière de sa membrane par un volume d'air minimal ; mais il peut, selon un mode de réalisation, être également conçu à cette fin. Le dispositif selon l'invention comprend d'autre part un amplificateur interne, préférablement de classe D, intégré à l'enceinte. Il est constitué d'au moins deux canaux (3) et (3') connectés séparément à chaque haut-parleur (1) et (2). Chacun de ces deux canaux centraux amplifiés est calibré afin de permettre une modulation précise et différenciée de leurs plages de fréquences concernant les caractéristiques de chaque haut-parleur (1) et (2) et le cas échéant de leurs niveaux sonores respectifs. Ce filtrage permet notamment par exemple, et dans ce mode de réalisation, de réduire progressivement le niveau du haut- parleur arrière (2) au-dessus et à partir de 70 Hz, comme illustré sur le schéma de la Figure 5, afin d'éviter, comme expliqué ci-dessus, toute interférence négative du haut-parleur arrière (2) sur le haut-parleur avant (1).This device according to the invention, reference being made to the Figures 1, 2 and 3 , consists of a front loudspeaker (1) and a rear loudspeaker (2), mechanically coupled together via a small volume of air itself preferably delimited by a room link forming a watertight bulkhead (4) and connecting these two loudspeakers. This connecting piece can be of complex shape, adapted to the geometry of said loudspeakers and manufactured possibly using injection, thermoforming or 3D printing techniques. A vent (5) ensures the pneumatic connection between the outside air and the internal part of the enclosure located outside this sealed volume; a second vent (5') can also be provided as is apparent from the Figure 3 . This or these vents make it possible to recover the acoustic energy produced by the rear loudspeaker (2) and can emerge either towards the front of the enclosure ( Figure 2 and 3 ) or behind it ( Figure 1 ). The rear loudspeaker (2) intrinsically has a lower resonance frequency than that of the front loudspeaker (1), the latter being loaded at the rear of its membrane by a minimum volume of air; but it can, according to one embodiment, also be designed for this purpose. The device according to the invention also comprises an internal amplifier, preferably of class D, integrated into the enclosure. It consists of at least two channels (3) and (3') connected separately to each loudspeaker (1) and (2). Each of these two amplified central channels is calibrated in order to allow a precise and differentiated modulation of their frequency ranges concerning the characteristics of each loudspeaker (1) and (2) and, where appropriate, of their respective sound levels. This filtering makes it possible in particular, for example, and in this embodiment, to gradually reduce the level of the rear loudspeaker (2) above and from 70 Hz, as illustrated in the diagram of the Figure 5 , in order to avoid, as explained above, any negative interference from the rear loudspeaker (2) to the front loudspeaker (1).

De la même manière, compte tenu de l'inversion de phase généralement constatée dans ce type de configuration au-dessus de 130 Hz et de la chute de niveau du haut-parleur avant qui en résulte à partir de cette fréquence (jusqu'autour de 200 Hz), en même temps, cette dernière atténuation permettra de réduire sensiblement ce phénomène. Par ailleurs, la chute naturelle du rendement sonore constatée pour toute enceinte acoustique de faible volume dans les fréquences graves, peut être ainsi corrigée activement par un réglage électronique dédié qui permette d'obtenir une accentuation notable du niveau sonore de ces fréquences graves, sans altération du taux de distorsion ni au détriment de l'intelligibilité des fréquences bas médium. L'éloignement de la limite de distorsion obtenu permet avantageusement en effet, grâce à ce niveau d'amplification élevé intégré dans l'enceinte, de parvenir à une compensation égale ou supérieure à 5db pour une plage de fréquences située ici en dessous de 100 Hz par rapport au niveau linéaire moyen d'amplification relatif aux fréquences situées au-dessus de ce seuil. Ainsi, dans le dispositif selon l'invention chaque canal d'amplification (3), (3') pourra être atténué de façon différenciée d'au moins - 6db en dessous ou autour de chaque fréquence de résonnance des deux haut-parleurs (1) et (2).Similarly, given the phase inversion typically seen in this type of setup above 130 Hz and the resulting front speaker level drop from that frequency (down to around 200 Hz), at the same time, this last attenuation will significantly reduce this phenomenon. In addition, the natural drop in sound efficiency observed for any low-volume loudspeaker in the bass frequencies can thus be actively corrected by a dedicated electronic adjustment which makes it possible to obtain a notable increase in the sound level of these bass frequencies, without altering the distortion rate nor to the detriment of the intelligibility of low-mid frequencies. The distance from the distortion limit obtained advantageously makes it possible, thanks to this high level of amplification integrated into the enclosure, to achieve compensation equal or greater than 5 db for a range of frequencies situated here below 100 Hz with respect to the average linear level of amplification relating to the frequencies situated above this threshold. Thus, in the device according to the invention, each amplification channel (3), (3') can be attenuated in a differentiated manner by at least -6db below or around each resonance frequency of the two loudspeakers (1 ) and (2).

D'autres seuils et fréquences plus ou moins élevés pourront être bien sûr prédéfinis au cas par cas en fonction des rendements et du diamètre des différents haut-parleurs utilisés ainsi que des puissances d'amplification disponibles.Other more or less high thresholds and frequencies could of course be predefined on a case-by-case basis depending on the yields and the diameter of the various loudspeakers used as well as the amplification powers available.

De la même façon, le dispositif selon l'invention permet une optimisation du taux de contre-réaction de l'amplificateur. Un amplificateur externe se doit d'être polyvalent et son taux de contre-réaction est élevé (généralement situé à environ 1 volt pour un gain de 2000). En abaissant le taux de contre-réaction d'un amplificateur standard, il serait possible d'obtenir avec des enceintes acoustiques traditionnelles un élargissement de leur bande passante mais les haut-parleurs de ces enceintes ne manqueraient pas de rapidement saturer, distordre, puis de se détériorer. Le dispositif selon l'invention permet de contourner ce problème et de réduire le taux de contre-réaction de l'amplificateur dédié pour des valeurs de gain sensiblement inférieures à 1000 pour 1 volt au niveau des canaux (3), (3') tout en gardant une distorsion des haut-parleurs faible et un son plus naturel.In the same way, the device according to the invention allows an optimization of the feedback rate of the amplifier. An external amplifier should be versatile and its feedback rate is high (usually around 1 volt for a gain of 2000). By lowering the feedback rate of a standard amplifier, it would be possible to obtain with traditional loudspeakers a widening of their bandwidth, but the loudspeakers of these loudspeakers would not fail to quickly saturate, distort, then deteriorate. The device according to the invention makes it possible to circumvent this problem and to reduce the feedback rate of the dedicated amplifier for gain values substantially less than 1000 for 1 volt at the level of the channels (3), (3') while keeping speaker distortion low and sound more natural.

Deux ou quatre canaux amplifiés supplémentaires éventuels permettront par ailleurs d'alimenter séparément les haut-parleurs spécialisés dans les fréquences élevées (6) et (6') concernant les aigus et éventuellement les médiums, tels que prévus dans une variante d'exécution de la présente invention. Avantageusement, les haut-parleurs d'aigus (6) et (6') et éventuellement de médiums, seront alimentés séparément par des canaux d'amplificateur différenciés.Two or four additional amplified channels, if any, will also make it possible to separately supply the loudspeakers specialized in the high frequencies (6) and (6') concerning the treble and possibly the midrange, as provided in a variant embodiment of the present invention. Advantageously, the treble loudspeakers (6) and (6') and possibly midrange loudspeakers will be supplied separately by differentiated amplifier channels.

Ainsi qu'il ressort de ce qui précède, plusieurs variantes d'exécution du dispositif selon l'invention sont envisageables, sans pour autant sortir du cadre de ladite invention.As emerges from the foregoing, several variant embodiments of the device according to the invention are possible, without thereby departing from the scope of said invention.

La variante de la Figure 1 concerne un dispositif où sont représentés schématiquement les deux haut-parleurs (1) et (2) à l'intérieur d'une enceinte monobloc amplifiée d'architecture classique et dotée d'un seul évent (5) tourné vers l'arrière de l'enceinte ; à la Figure 2, cet évent (5) est tourné vers l'avant de ladite enceinte.The variant of the Figure 1 relates to a device in which the two loudspeakers (1) and (2) are schematically represented inside an amplified one-piece enclosure of conventional architecture and equipped with a single vent (5) facing the rear of the 'pregnant ; to the Figure 2 , this vent (5) faces the front of said enclosure.

La variante illustrée à la Figure 3 concerne un dispositif où sont représentés schématiquement les deux haut-parleurs (1) et (2) à l'intérieur d'une enceinte monobloc amplifiée, équipée d'un système de diffusion des aigus par les haut-parleurs (6) et (6'), ainsi que de deux évents (5) et (5') tournés vers l'avant de ladite enceinte.The variant illustrated in Figure 3 relates to a device in which the two loudspeakers (1) and (2) are schematically represented inside a one-piece enclosure amplified, equipped with a treble distribution system via the loudspeakers (6) and (6'), as well as two vents (5) and (5') facing the front of said enclosure.

De façon simple à réaliser et peu onéreuse, tant au niveau de l'électronique embarquée que de l'implantation acoustique, on dispose, dans un volume d'enceinte particulièrement compact et là où un haut-parleur unique aurait plus rapidement atteint ses limites en termes de puissance admissible, d'une configuration active de haut-parleurs permettant d'obtenir un taux de distorsion particulièrement bas dans les fréquences graves et une courbe de réponse sensiblement étendue vers le bas compte tenu des volumes disponibles, y compris à forte puissance. Cela est obtenu grâce à l'intégration et à la calibration d'un amplificateur interne comportant au moins deux canaux indépendants (3) (3') dont le niveau sonore de chaque canal est filtré et modulé afin d'éviter toute interaction négative entre les deux haut- parleurs (1) et (2) et afin qu'il puisse être relevé notablement (d'au moins + 3 db) en dessous des fréquences situées autour de 200 Hz (registre des fréquences graves). Avantageusement, le niveau de puissance du canal qui alimente le haut- parleur arrière (2), à l'intérieur d'une plage de fréquences située entre la fréquence de résonnance de ce haut-parleur (2) et possiblement jusqu'à 200 Hz, est relevé ponctuellement d'au moins +3db par rapport au niveau moyen de puissance d'amplification des haut- parleurs. Ces canaux d'amplification distincts (3) et (3') possèdent chacun leur bande de fréquence spécifique de manière à ce que la courbe de réponse en fréquences du haut-parleur arrière (2) soit progressivement atténuée d'au moins 3db à partir et au-dessus d'une plage de fréquences située entre 60 Hz et 120 Hz. Chaque canal d'amplification (3), (3') est atténué progressivement et à partir de chaque fréquence de résonnance des haut-parleurs (1), (2).In a way that is simple to produce and inexpensive, both in terms of the on-board electronics and the acoustic layout, we have, in a particularly compact enclosure volume and where a single loudspeaker would have more quickly reached its limits in in terms of admissible power, of an active loudspeaker configuration making it possible to obtain a particularly low distortion rate in the bass frequencies and a response curve that is noticeably extended downwards given the volumes available, including at high power. This is achieved by integrating and calibrating an internal amplifier comprising at least two independent channels (3) (3'), the sound level of each channel of which is filtered and modulated in order to avoid any negative interaction between the two loudspeakers (1) and (2) and so that it can be raised significantly (by at least + 3 db) below frequencies situated around 200 Hz (low frequency register). Advantageously, the power level of the channel which supplies the rear loudspeaker (2), within a frequency range situated between the resonance frequency of this loudspeaker (2) and possibly up to 200 Hz , is occasionally raised by at least +3db with respect to the average amplification power level of the loudspeakers. These distinct amplification channels (3) and (3') each have their specific frequency band so that the frequency response curve of the rear loudspeaker (2) is progressively attenuated by at least 3db from and above a frequency range between 60 Hz and 120 Hz. Each amplification channel (3), (3') is gradually attenuated and starting from each resonance frequency of the loudspeakers (1), (2).

De la même manière, afin d'éviter toute consommation inutile de puissance de l'amplificateur dans les plus basses fréquences, il sera possible d'atténuer fortement l'amplification des fréquences graves en dessous des valeurs représentées par chacune des fréquences de résonnance des haut-parleurs concernés, par exemple en dessous de 40 Hz, comme cela est représenté sur le schéma de la Figure 5 de la présente description.In the same way, in order to avoid any useless consumption of power by the amplifier in the lowest frequencies, it will be possible to strongly attenuate the amplification of the bass frequencies below the values represented by each of the resonance frequencies of the highs. -speakers concerned, for example below 40 Hz, as shown in the diagram of the Figure 5 of this description.

La courbe de la Figure 6 est la courbe de réponse en fréquence, après corrections, du haut-parleur arrière (2), du haut-parleur avant (1) ainsi que la représentation (en pointillé) à la jonction de celles-ci de leur courbe résultante.The curve of the Figure 6 is the frequency response curve, after corrections, of the rear loudspeaker (2), of the front loudspeaker (1) as well as the representation (in dotted line) at the junction of these of their resulting curve.

Les récents progrès dans le domaine du numérique (amplificateurs de classe D) permettent par ailleurs de disposer avantageusement d'une puissance importante et modulable dans les fréquences graves à relativement faible coût, le tout dans un faible encombrement et sans craindre d'élévation incontrôlée de la température interne du système. L'ensemble pourra intégrer aussi des haut-parleurs (6) et (6') chargés de reproduire les fréquences aiguës et éventuellement médiums, qui pourront ainsi être placés, soit selon des schémas d'enceintes classiques (Figure 1 et Figure 2) soit éventuellement selon des schémas plus complexes (Figure 3). Sur la Figure 3 les haut-parleurs (6) et (6') chargés de restituer les fréquences élevées ont été avantageusement inclinés vers le haut et positionnés dans une direction opposée des haut-parleurs (1) et (2) afin de faire bénéficier plus avantageusement à l'ensemble d'un effet spatial. Une configuration plus traditionnelle est exposée sur les Figures 1 et 2 pour ces haut-parleurs d'aigus et/ou de médiums qui ne sont pas inclinés. L'ensemble de ces différents haut-parleurs dédiés aux fréquences élevées pourra être piloté en fréquences par des moyens classiques (filtres passifs) ou préférablement par des systèmes actifs (amplificateurs) spécifiques.Recent advances in the digital field (class D amplifiers) also make it possible to advantageously have significant and adjustable power in the low frequencies at relatively low cost, all in a small footprint and without fear of uncontrolled rise in the internal temperature of the system. The assembly can also incorporate loudspeakers (6) and (6') responsible for reproducing the high frequencies and possibly the mids, which can thus be placed either according to conventional loudspeaker diagrams ( Figure 1 and Figure 2 ) or possibly according to more complex schemes ( Figure 3 ). On the Figure 3 the loudspeakers (6) and (6') responsible for restoring the high frequencies have been advantageously inclined upwards and positioned in an opposite direction from the loudspeakers (1) and (2) in order to benefit more advantageously to the set of a spatial effect. A more traditional configuration is shown on the Figures 1 and 2 for those tweeters and/or midrange speakers that are not angled. All of these different loudspeakers dedicated to high frequencies can be controlled in frequency by conventional means (passive filters) or preferably by specific active systems (amplifiers).

Claims (9)

  1. Amplified acoustic speaker of the type comprising:
    * two loudspeakers (1, 2), one (1) of which is located at the front and is intended to reproduce the midrange and low frequencies, and the other (2) of which is placed close to and at the rear of said first loudspeaker and is intended to reproduce the low frequencies, which loudspeakers are pneumatically connected to one another by a sealed compartment (4),
    * at least one vent (5, 5') which does not communicate pneumatically with this sealed compartment and which connects the interior part of the speaker to the exterior thereof, characterized in that each of these two loudspeakers (1) and (2) is supplied by separate amplification channels (3) and (3') and each has their specific frequency band such that the frequency response curve of the rear loudspeaker (2) is progressively attenuated by at least 3db from and above a frequency range between 60 Hz and 120 Hz.
  2. Speaker according to claim 1, characterized in that each amplification channel is progressively attenuated below and starting from each resonance frequency of the loudspeakers (1) and (2).
  3. Speaker according to either claim 1 or claim 2, characterized in that the power level of the channel which supplies the rear loudspeaker (2), within a frequency range between the resonance frequency of this loudspeaker (2) and possibly up to 200 Hz, is occasionally raised by at least +3db compared to the average level of amplification power of the loudspeakers.
  4. Speaker according to any of claims 1 to 3, characterized in that each amplification channel (3), (3') is attenuated in a differentiated manner by at least -6db below or around each resonance frequency of the two loudspeakers (1) and (2).
  5. Speaker according to any of claims 1 to 4, characterized in that the negative feedback of the internal amplifier is calibrated for values corresponding to a gain of less than 1000 for 1 volt in the channels (3), (3').
  6. Speaker according to any of claims 1 to 5, characterized in that the rear loudspeaker (2) has a resonance frequency which is lower than that of the front loudspeaker (1).
  7. Speaker according to any of claims 1 to 6, characterized in that the loudspeakers (1) and (2) are supplemented by two tweeters (6) and (6') and possibly midrange speakers.
  8. Speaker according to claim 7, characterized in that said tweeters (6) and (6') and possibly the midrange speakers are supplied separately by differentiated internal amplifier channels.
  9. Speaker according to any of claims 1 to 8, characterized in that said tweeters (6) and (6') and possibly the midrange speakers are oriented in the opposite direction to the loudspeakers (1) and (2) and tilted upward.
EP18714556.0A 2017-03-16 2018-03-15 One-piece device for a powered speaker enclosure Active EP3596938B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1700273A FR3064146B1 (en) 2017-03-16 2017-03-16 MONOBLOCK AND STEREOPHONIC DEVICE OF AMPLIFIED ACOUSTIC ENCLOSURE
PCT/FR2018/000054 WO2018167386A1 (en) 2017-03-16 2018-03-15 One-piece device for a powered speaker enclosure

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EP3596938A1 EP3596938A1 (en) 2020-01-22
EP3596938B1 true EP3596938B1 (en) 2022-05-11

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Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
FR2343388A1 (en) * 1976-03-05 1977-09-30 Siare Loudspeaker enclosure with resonating chamber - has two loudspeakers acoustically and electrically coupled to improve LF performance
FR2625844A1 (en) * 1988-01-13 1989-07-13 Audio Design "Push-pull" loudspeaker acoustic system for chambers
US5374124A (en) * 1993-04-06 1994-12-20 Cass Audio, Inc. Multi-compound isobarik loudspeaker system
US6353670B1 (en) * 1996-07-02 2002-03-05 Donald R. Gasner Actively control sound transducer
NZ535385A (en) * 2002-03-05 2006-02-24 Audio Products Int Corp Loudspeaker with shaped sound field
US20060147075A1 (en) * 2004-12-31 2006-07-06 Gingko Audio Loudspeaker comprising coaxially-disposed drivers
US20080285762A1 (en) * 2007-05-15 2008-11-20 Keiichi Iwamoto Point source speaker systems
TWI635753B (en) * 2013-01-07 2018-09-11 美商杜比實驗室特許公司 Virtual height filter for reflected sound rendering using upward firing drivers

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FR3064146A1 (en) 2018-09-21
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EP3596938A1 (en) 2020-01-22

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