EP3596938A1 - One-piece device for a powered speaker enclosure - Google Patents

One-piece device for a powered speaker enclosure

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Publication number
EP3596938A1
EP3596938A1 EP18714556.0A EP18714556A EP3596938A1 EP 3596938 A1 EP3596938 A1 EP 3596938A1 EP 18714556 A EP18714556 A EP 18714556A EP 3596938 A1 EP3596938 A1 EP 3596938A1
Authority
EP
European Patent Office
Prior art keywords
speakers
enclosure according
loudspeakers
speaker
enclosure
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.)
Granted
Application number
EP18714556.0A
Other languages
German (de)
French (fr)
Other versions
EP3596938B1 (en
Inventor
Timothée Cagniard
Thierry Cagniard
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Cc Lab
Original Assignee
Cc Lab
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Publication of EP3596938A1 publication Critical patent/EP3596938A1/en
Application granted granted Critical
Publication of EP3596938B1 publication Critical patent/EP3596938B1/en
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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 
    • H04R1/227—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 monobloc amplified loudspeaker device.
  • Integral control systems make it possible to control the elongation of the membranes of the subwoofer or, as described in US Pat. No. 6,353,670 (GASNER DONALD R), the harmful resonances measured punctually at certain frequencies inside. loudspeakers themselves. While increasing or reducing punctually the magnitude of the displacement of their membranes and thus the noise level of the speakers in the low register, we manage to control these same displacements by limiting them to high power when their voice coil moves away too much of its magnetic field or when the sound level at certain frequencies leads to undesirable internal resonance effects, so that any distortion or sound coloring can be permanently contained, whatever the level of listening.
  • These systems which require electronic circuits and specific sensors often complex, as shown in the aforementioned US Pat. No. 6,353,670, as well as, if possible an amplification all the more powerful as the size of the loudspeakers decreases, are reserved for high-end achievements.
  • the two speakers control their possible excessive elongations and thereby allow, at equivalent sound power level, to significantly reduce the distortion found in the low frequencies compared to that of a conventional acoustic loudspeaker of equivalent size. Moreover, a better sound level is obtained in the low register than with a conventional closed charge while maintaining, as for a vented speaker, a bandwidth of good level in the low end of the sound spectrum while remaining compatible with a suitability. power without distortion.
  • the speakers of such a device are intended to be connected to a separate, versatile amplifier.
  • the rear speaker connected to the audio output of the external amplifier is connected with the front speaker in a parallel electrical scheme.
  • the front speaker when relayed in frequencies to the top of the sound spectrum only by tweeters, is responsible for reproducing in this classic pattern of configuration the bass register and the midrange / treble register.
  • the said rear loudspeaker whose cone is directed towards the rear of the front loudspeaker membrane and which is thus not filtered separately, rises logically in frequencies like the front loudspeaker, producing in the direction of the loudspeaker. rear of the membrane thereof, especially above 120 Hz, interference in the form of standing waves harmful to the sound reproduction and sound clarity in the midrange of the entire system.
  • the two speakers work rigorously 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 movement of the two high-power membranes.
  • the front speaker which no longer functions as a piston, is displaced by compared to the rear loudspeaker, thereby causing the medium low frequency band a level drop.
  • the front speaker which has at the rear of its membrane a small volume of air, intrinsically resonates at a frequency substantially higher than that of the rear speaker, which prevents it, all by unnecessarily consuming power, being electrically active in the extreme low, unlike the rear speaker.
  • the double partition results in a mandatory complication of the traditional cabinetmaking scheme, a larger volume and less tight as well as a complication of the assembly workforce dedicated to the second internal speaker.
  • the device object of the present invention while adopting the same pattern of implantation of loudspeakers in tandem, aims to overcome all the various disadvantages described above, as well as to seize the opportunity offered by the recent technical possibilities for powerful, compact and powerful amplifications.
  • the device according to the invention is an amplified acoustic enclosure of the type comprising:
  • vent not communicating pneumatically with this sealed compartment and connecting the inner part of the enclosure to the outside thereof
  • each of these two loudspeakers (1) and (2) is fed by separate amplification channels (3) and (3 ') and each having their specific frequency band so as to that the frequency response curve of the rear loudspeaker (2) is gradually attenuated by at least 3db from and above a frequency range between 60 Hz and 120 Hz.
  • Figure 1 is a cross-sectional view of the device according to a first embodiment of the invention
  • FIGS. 1, 2 and 3 are plan views of the device according to another embodiment of the invention.
  • This device according to the invention consists of a front loudspeaker (1) and a rear loudspeaker (2), mechanically coupled together by the intermediate a small volume of air itself delimited preferably by a connecting piece forming a watertight partition (4) and connecting these two speakers.
  • This connecting piece can be of complex shape, adapted to the geometry of said speakers and manufactured using possibly injection techniques, thermoforming or 3D printing.
  • a vent (5) provides the pneumatic connection between the outside air and the inner part of the chamber located outside of this sealed volume; a second vent (5 ') can also be provided as shown in Figure 3.
  • the rear loudspeaker (2) intrinsically has a lower resonant frequency than that of the front speaker (1), the latter being charged at the rear of its membrane by a minimum volume of air; but it may, according to one embodiment, also be designed for this purpose.
  • the device according to the invention further comprises an internal amplifier, preferably of class D, integrated in the enclosure. It consists of at least two channels (3) and (3 ') separately connected to each speaker (1) and (2).
  • Each of these two amplified central channels is calibrated to allow precise and differentiated modulation of their frequency ranges concerning the characteristics of each loudspeaker (1) and (2) and, if appropriate, their respective sound levels.
  • This filtering makes it possible, 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 below, in order to avoid , as explained above, any negative interference of the rear loudspeaker (2) on the front loudspeaker (1).
  • each amplification channel (3), (3 ') can be differentially attenuated by at least -6db below or around each resonance frequency of the two loudspeakers (1 ) and (2).
  • thresholds and higher or lower frequencies can of course be predefined on a case by case basis depending on the yields and the diameter of the various speakers used as well as amplification powers available.
  • the device according to the invention makes it possible to optimize the rate of feedback of the amplifier.
  • An external amplifier must be versatile and its feedback rate is high (usually about 1 volt for a gain of 2000).
  • 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 lower than 1000 for 1 volt at the channels (3), (3 ') while keeping the distortion of the speakers low and a more natural sound.
  • Two or four additional amplified channels possible will also enable the loudspeakers specialized in the high frequencies (6) and (6 ') to be separately supplied with respect to the treble and possibly the midrange, as provided for in an alternative embodiment of the invention.
  • the tweeters (6) and (6 ') and possibly mediums will be powered separately by differentiated amplifier channels.
  • FIG. 1 concerns a device in which the two loudspeakers (1) and (2) are schematically represented inside an amplified monobloc enclosure of conventional architecture and equipped with a single vent (5) towards the back of the enclosure; in Figure 2, this vent (5) is facing towards the front of said enclosure.
  • FIG. 3 concerns a device in which are schematically represented the two loudspeakers (1) and (2) inside an amplified monoblock enclosure, equipped with a system for broadcasting the highs by the loudspeakers. speakers (6) and (6 '), as well as two vents (5) and (5') facing towards the front of said enclosure.
  • the power level of the channel which powers the rear loudspeaker (2), within a frequency range situated between the resonance frequency of this loudspeaker (2) and possibly up to 200 Hz is noted punctually by at least + 3db with respect to the average amplification power level of the loudspeakers.
  • These separate amplification channels (3) and (3 ') each have their specific frequency band so that the frequency response curve of the rear loudspeaker (2) is gradually 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 from each resonance frequency of the loudspeakers (1), (2).
  • the curve below 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 integrate loudspeakers (6) and (6 ') responsible for reproducing the high frequencies and possibly medium frequencies, which can thus be placed either according to conventional speaker diagrams ( Figure 1 and Figure 2) or possibly in more complex patterns ( Figure 3).
  • the speakers (6) and (6 ') responsible for restoring the high frequencies have been advantageously inclined upwards and positioned in an opposite direction of the loudspeakers (1) and (2) in order to benefit from more advantageously to the whole of a spatial effect.
  • FIG. 1 and 2 A more traditional configuration is shown in Figures 1 and 2 for these tweeters and / or midrange speakers that are not inclined. All of these different loudspeakers dedicated to high frequencies can be controlled in frequencies by conventional means (passive filters) or preferably by specific active systems (amplifiers).

Abstract

The present invention relates to a one-piece device for a powered speaker enclosure. According to the invention, the powered speaker enclosure comprises in particular: two central loudspeakers intended to reproduce low frequencies, one located at the front and the other located close to and behind the latter, pneumatically connected to each other in a sealed compartment, at least one vent not communicating pneumatically with the sealed compartment and connecting the inner portion of the enclosure to the outer portion thereof, wherein each of the two loudspeakers (1) and (2), intended to reproduce low frequencies, is powered by separate amplification channels (3) and (3'), each having their respective frequency band.

Description

Dispositif monobloc d'enceinte acoustique amplifiée.  Monobloc amplified loudspeaker device.
La présente invention concerne un dispositif monobloc d'enceinte acoustique amplifiée.  The present invention relates to a monobloc amplified loudspeaker 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 see from their phone, a small speaker can not reproduce bass frequencies. More generally speaking of compact audio products, the combination amplifier / speaker available does not usually achieve this goal because of lack of resources: amplifier power (or batteries) too low, distortion rate in the important bass frequencies at high level, all coupled to speakers too too small.
Ainsi le marché de audio depuis des décennies se partage globalement en deux avec d'une part, des systèmes de haute-fidélité encombrants et chefs 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 is divided in two globally with on the one hand, bulky high-fidelity systems and heads and on the other compact systems of poor quality not allowing, among other things, to coexist a quality listening in the low 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 speakers 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.  Integral control systems make it possible to control the elongation of the membranes of the subwoofer or, as described in US Pat. No. 6,353,670 (GASNER DONALD R), the harmful resonances measured punctually at certain frequencies inside. loudspeakers themselves. While increasing or reducing punctually the magnitude of the displacement of their membranes and thus the noise level of the speakers in the low register, we manage to control these same displacements by limiting them to high power when their voice coil moves away too much of its magnetic field or when the sound level at certain frequencies leads to undesirable internal resonance effects, so that any distortion or sound coloring can be permanently contained, whatever the level of listening. These systems, which require electronic circuits and specific sensors often complex, as shown in the aforementioned US Pat. No. 6,353,670, as well as, if possible an amplification all the more powerful as the size of the loudspeakers decreases, are reserved for high-end achievements.
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, in view of the need for simplification and miniaturization of loudspeakers in recent years, there are systems which make it possible, on the basis of differentiated multi-channel amplifiers, to improve stereophonic broadcasting, as illustrated, for example, in patent application US 2008285762 (IWAMOTO KEIICHI), from a monoblock source, allowing to control in particular activates by interferometry the stereophonic effect. But without dealing with the problem posed above, namely the improvement of the reproduction of low frequencies within a small volume of speakers.
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 suivant 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 ci-dessous, 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.  For the most part, and generally speaking, at the level of the bass register reproduction, many generally simpler systems of compact speakers are developed by using loud elongation loudspeakers placed in closed charge. This technique, which makes it possible to accept a certain theoretical power, does not allow, nevertheless, to offer, especially with small diameter loudspeakers, a sufficient acoustic output given the significant drop in sound level observed in the low frequencies. using this technique; the following diagram illustrates the above. It is also possible and very common to use speaker systems charged by a vent. These systems, as can be seen by comparison in the same diagram below, allow better acoustic performance in the low frequencies. Given the significant elongations of the bass woofer concerned - except when it is large diameter - which are no longer controlled by the compression of the closed air volume placed at the rear of the membrane thereof as on a closed enclosure, there is a significant rise in the distortion measured at high power in the low register.
SO 100 200 t-iz  SO 100 200 t-iz
Enceinte a évent  Vented enclosure
ΕΞη ceinte close 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 that has become widely used in recent years, particularly for the production of miniature speakers on batteries: it is the passive radiator, which doubles by the speaker radiation at the low end of the sound spectrum and thus significantly increases the sound level in this frequency range. But which also does not support without distortion a significant noise level. However, there is a solution 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 French Patent FR 2 343 388 (SIARE). This patent describes a device that consists of placing two speakers one behind the other. A vent pneumatically sealing the outside of the enclosure to its internal rear volume and passing through a baffle parallel to the front, perforated and supporting the second speaker, retrieves the back 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 speakers control their possible excessive elongations and thereby allow, at equivalent sound power level, to significantly reduce the distortion found in the low frequencies compared to that of a conventional acoustic loudspeaker of equivalent size. Moreover, a better sound level is obtained in the low register than with a conventional closed charge while maintaining, as for a vented speaker, a bandwidth of good level in the low end of the sound spectrum while remaining compatible with a suitability. power without distortion.
Cette technique, qui concernait par définition des enceintes traditionnelles équipées de filtres passifs, possède toutefois des inconvénients.  This technique, which concerned by definition traditional speakers equipped with passive filters, however, has disadvantages.
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 speakers of such a device are intended to be connected to a separate, versatile amplifier. The rear speaker connected to the audio output of the external amplifier is connected with the front speaker in a parallel electrical scheme. The front speaker, when relayed in frequencies to the top of the sound spectrum only by tweeters, is responsible for reproducing in this classic pattern of configuration the bass register and the midrange / treble register. The said rear loudspeaker, whose cone is directed towards the rear of the front loudspeaker membrane and which is thus not filtered separately, rises logically in frequencies like the front loudspeaker, producing in the direction of the loudspeaker. rear of the membrane thereof, especially above 120 Hz, interference in the form of standing waves harmful to the 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'oeuvre de montage dédiée à ce deuxième haut-parleur interne. Moreover and vice versa, over the entire frequency range below 120 Hz, the two speakers work rigorously 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 movement of the two high-power membranes. On the other hand, beyond this threshold (120 - 150 Hz), the front speaker, which no longer functions as a piston, is displaced by compared to the rear loudspeaker, thereby causing the medium low frequency band a level drop. The front speaker, finally, which has at the rear of its membrane a small volume of air, intrinsically resonates at a frequency substantially higher than that of the rear speaker, which prevents it, all by unnecessarily consuming power, being electrically active in the extreme low, unlike the rear speaker. Finally, the double partition results in a mandatory complication of the traditional cabinetmaking scheme, a larger volume and less tight as well as a complication of the assembly workforce dedicated to the second internal speaker.
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 object of the present invention, while adopting the same pattern of implantation of loudspeakers in tandem, aims to overcome all the various disadvantages described above, as well as to seize the opportunity offered by the recent technical possibilities for powerful, compact and powerful amplifications.
De façon plus précise, le dispositif selon l'invention est une enceinte acoustique amplifiée du type comprenant :  More specifically, the device according to the invention is an amplified acoustic enclosure of the type comprising:
* 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, * two speakers, one located on the front, intended to reproduce the midrange and low frequencies, and the other, placed near and at the back of the latter intended to reproduce the low frequencies and pneumatically connected the one to the other by a watertight compartment,
* 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, at least one vent not communicating pneumatically with this sealed compartment and connecting the inner part of the enclosure to the outside thereof,
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. said loudspeaker being characterized in that each of these two loudspeakers (1) and (2) is fed by separate amplification channels (3) and (3 ') and each having their specific frequency band so as to that the frequency response curve of the rear loudspeaker (2) is gradually attenuated by at least 3db from and above a frequency range 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 :  The characteristics of the device according to the invention will emerge more clearly on reading the description which follows, with reference to the following figures given for information only and in no way limiting, among which:
la Figure 1 est une vue en coupe transversale du dispositif selon un premier mode de réalisation de l'invention,  Figure 1 is a cross-sectional view of the device according to a first embodiment of the invention,
la Figure 2 est une variante vue en plan du dispositif illustré à la Figure 1 , et la Figure 3 est une vue en plan du dispositif selon un autre mode de réalisation de l'invention. Ce dispositif selon l'invention, référence étant faite aux Figure 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 ci-après, afin d'éviter, comme expliqué ci-dessus, toute interférence négative du haut-parleur arrière (2) sur le haut-parleur avant (1). Figure 2 is a plan view variant of the device shown in Figure 1, and Figure 3 is a plan view of the device according to another embodiment of the invention. This device according to the invention, reference being made to FIGS. 1, 2 and 3, consists of a front loudspeaker (1) and a rear loudspeaker (2), mechanically coupled together by the intermediate a small volume of air itself delimited preferably by a connecting piece forming a watertight partition (4) and connecting these two speakers. This connecting piece can be of complex shape, adapted to the geometry of said speakers and manufactured using possibly injection techniques, thermoforming or 3D printing. A vent (5) provides the pneumatic connection between the outside air and the inner part of the chamber located outside of this sealed volume; a second vent (5 ') can also be provided as shown in Figure 3. This or these vents can recover the acoustic energy produced by the rear speaker (2) and can lead either forward of the enclosure (Figures 2 and 3) or towards the rear of the enclosure (Figure 1). The rear loudspeaker (2) intrinsically has a lower resonant frequency than that of the front speaker (1), the latter being charged at the rear of its membrane by a minimum volume of air; but it may, according to one embodiment, also be designed for this purpose. The device according to the invention further comprises an internal amplifier, preferably of class D, integrated in the enclosure. It consists of at least two channels (3) and (3 ') separately connected to each speaker (1) and (2). Each of these two amplified central channels is calibrated to allow precise and differentiated modulation of their frequency ranges concerning the characteristics of each loudspeaker (1) and (2) and, if appropriate, their respective sound levels. This filtering makes it possible, 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 below, in order to avoid , as explained above, any negative interference of the rear loudspeaker (2) on 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). In the same way, considering the phase inversion generally observed in this type of configuration above 130 Hz and the resulting falling level of the front speaker from this frequency (up to around 200 Hz), at the same time, this last attenuation will significantly reduce this phenomenon. Moreover, the natural fall in the sound efficiency observed for any low volume acoustic loudspeaker in the low frequencies, can be actively corrected by a dedicated electronic adjustment that allows to obtain a significant increase in the sound level of these low frequencies, without alteration. distortion rate or at the expense of the intelligibility of low-medium frequencies. The distance from the distortion limit obtained advantageously makes it possible, thanks to this high level of amplification integrated into the chamber, to achieve a compensation equal to or greater than 5 dB for a frequency range here below 100 Hz. compared to the average linear amplification level relative to frequencies above this threshold. Thus, in the device according to the invention, each amplification channel (3), (3 ') can be differentially attenuated 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 thresholds and higher or lower frequencies can of course be predefined on a case by case basis depending on the yields and the diameter of the various speakers used as well as 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 makes it possible to optimize the rate of feedback of the amplifier. An external amplifier must be versatile and its feedback rate is high (usually about 1 volt for a gain of 2000). By lowering the feedback rate of a standard amplifier, it would be possible to obtain an increase in bandwidth with traditional loudspeakers, but the loudspeakers of these loudspeakers would quickly saturate, distort, and 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 lower than 1000 for 1 volt at the channels (3), (3 ') while keeping the distortion of the speakers low and a more natural sound.
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 possible will also enable the loudspeakers specialized in the high frequencies (6) and (6 ') to be separately supplied with respect to the treble and possibly the midrange, as provided for in an alternative embodiment of the invention. present invention. Advantageously, the tweeters (6) and (6 ') and possibly mediums, will be powered 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 is apparent from the above, several alternative embodiments of the device according to the invention are conceivable, without 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 FIG. 1 concerns a device in which the two loudspeakers (1) and (2) are schematically represented inside an amplified monobloc enclosure of conventional architecture and equipped with a single vent (5) towards the back of the enclosure; in Figure 2, this vent (5) is facing towards 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 FIG. 3 concerns a device in which are schematically represented the two loudspeakers (1) and (2) inside an amplified monoblock enclosure, equipped with a system for broadcasting the highs by the loudspeakers. speakers (6) and (6 '), as well as two vents (5) and (5') facing towards 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 simple and inexpensive way, both in terms of on-board electronics and acoustic layout, we have, in a particularly compact speaker volume and where a single speaker would have reached its limits more quickly. terms of acceptable power, an active configuration of speakers to obtain a particularly low distortion rate in the low frequencies and a significantly extended response curve down given the available volumes, including high power. This is achieved by integrating and calibrating an internal amplifier having at least two independent channels (3) (3 ') whose noise level of each channel is filtered and modulated so as to avoid any negative interaction between them. two loudspeakers (1) and (2) and so that it can be raised significantly (by at least + 3 db) below frequencies around 200 Hz (low frequency register). Advantageously, the power level of the channel which powers the rear loudspeaker (2), within a frequency range situated between the resonance frequency of this loudspeaker (2) and possibly up to 200 Hz , is noted punctually by at least + 3db with respect to the average amplification power level of the loudspeakers. These separate amplification channels (3) and (3 ') each have their specific frequency band so that the frequency response curve of the rear loudspeaker (2) is gradually 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 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 figurant en page 5 de la présente description. In the same way, in order to avoid any unnecessary power consumption of the amplifier in the lower frequencies, it will be possible to strongly attenuate the amplification of the low frequencies below the values represented by each of the resonance frequencies of the speakers concerned, for example below 40 Hz, as shown in the diagram on page 5 of the present description.
La courbe ci-dessous 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 below 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.
20 Hz SO itiO 20O SOO 1 K 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.  20 Hz SO itiO 20O SOO 1 K Recent advances in the digital domain (class D amplifiers) also make it possible to advantageously have a large and flexible 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 integrate loudspeakers (6) and (6 ') responsible for reproducing the high frequencies and possibly medium frequencies, which can thus be placed either according to conventional speaker diagrams (Figure 1 and Figure 2) or possibly in more complex patterns (Figure 3). In Fig. 3 the speakers (6) and (6 ') responsible for restoring the high frequencies have been advantageously inclined upwards and positioned in an opposite direction of the loudspeakers (1) and (2) in order to benefit from more advantageously to the whole of a spatial effect. A more traditional configuration is shown in Figures 1 and 2 for these tweeters and / or midrange speakers that are not inclined. All of these different loudspeakers dedicated to high frequencies can be controlled in frequencies by conventional means (passive filters) or preferably by specific active systems (amplifiers).

Claims

REVENDICATIONS
1) Enceinte acoustique amplifiée du type comprenant : 1) Amplified acoustic speaker of the type comprising:
* 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,  * two speakers, one located on the front, intended to reproduce the midrange and low frequencies, and the other, placed near and at the back of the latter intended to reproduce the low frequencies and pneumatically connected the one to the other by a watertight compartment,
* 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,  at least one vent not communicating pneumatically with this sealed compartment and connecting the inner part of the enclosure to the outside thereof,
caractérisée 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. characterized in that each of these two loudspeakers (1) and (2) is fed by separate amplification channels (3) and (3 ') and each having their specific frequency band so that the curve frequency response 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) Enceinte selon la revendication 1, caractérisée en ce que chaque canal d'amplification est atténué progressivement en dessous et à partir de chaque fréquence de résonnance des haut- parleurs (1) et (2).  2) Enclosure according to claim 1, characterized in that each amplification channel is gradually attenuated below and from each resonance frequency of the speakers (1) and (2).
3) Enceinte selon l'une des revendications 1 ou 2, caractérisée en ce que 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.  3) Enclosure according to one of claims 1 or 2, characterized in that the power level of the channel which powers the rear speaker (2), within a frequency range located between the resonance frequency of this loudspeaker (2) and possibly up to 200 Hz, is occasionally noted at least + 3db with respect to the average level of amplification power of the loudspeakers.
4) Enceinte selon l'une quelconque des revendications 1 à 3 caractérisée en ce que chaque canal d'amplification (3), (3') est atténué de façon différenciée d'au moins -6db en dessous ou autour de chaque fréquence de résonnance des deux haut-parleurs (1) et (2).  4) Enclosure according to any one of claims 1 to 3 characterized in that each amplification channel (3), (3 ') is differentially attenuated by at least -6db below or around each resonance frequency two speakers (1) and (2).
5) Enceinte selon l'une quelconque des revendications 1 à 4 caractérisée en ce que la contre réaction de l'amplificateur interne est calibrée pour des valeurs correspondant à un gain inférieur à 1000 pour 1 volt au niveau des canaux (3), (3').  5) Enclosure according to any one of claims 1 to 4 characterized in that the feedback of the internal amplifier is calibrated for values corresponding to a gain of less than 1000 for 1 volt at the channels (3), (3) ').
6) Enceinte selon l'une quelconque des revendications 1 à 5 caractérisée en ce que le haut-parleur arrière (2) possède une fréquence de résonnance moins élevée que celle du haut-parleur avant (1).  6) Enclosure according to any one of claims 1 to 5 characterized in that the rear speaker (2) has a lower resonant frequency than that of the front speaker (1).
7) Enceinte selon l'une quelconque des revendications 1 à 6 caractérisée en ce que les haut-parleurs (1) et (2) sont complétés par deux haut-parleurs d'aigus (6) et (6') et éventuellement de médiums. 8) Enceinte selon la revendication 7 caractérisée en ce que lesdits haut-parleurs d'aigus (6) et (6') et éventuellement de médiums, sont alimentés séparément par des canaux d'amplificateur interne différenciés. 7) Enclosure according to any one of claims 1 to 6 characterized in that the loudspeakers (1) and (2) are supplemented by two tweeters (6) and (6 ') and possibly mediums . 8) Enclosure according to claim 7 characterized in that said treble speakers (6) and (6 ') and optionally mediums are supplied separately by differentiated internal amplifier channels.
9) Enceinte selon l'une quelconque des revendications 1 à 8 caractérisée en ce que lesdits haut-parleurs d'aigus (6) et (6') et éventuellement de médiums, sont orientés dans le sens opposé des haut-parleurs (1) et (2) et inclinés vers le haut.  9) Enclosure according to any one of claims 1 to 8 characterized in that said treble speakers (6) and (6 ') and possibly mediums, are oriented in the opposite direction of the speakers (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)

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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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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
RU2325789C2 (en) * 2002-03-05 2008-05-27 Одио Продактс Интернэшнл Корп. Speaker assembly with specifically 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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