EP3537729B1 - Speaker system - Google Patents

Description

The present invention relates to a loudspeaker system according to the preamble of claim 1.

From the EP 1 734 786 A1 a flat sound panel with a single soundboard is known, on the surface of which an excitation device is arranged in a node oscillation point to be determined by measurement.

Proceeding from the prior art mentioned above, the invention is based on the object of providing a loudspeaker system which is characterized by simpler manufacture and improved acoustic properties.

This object is achieved according to the invention by a loudspeaker system according to the features of claim 1.

Advantageous further developments are the subject matter of the dependent claims dependent on claim 1.

According to claim 1, a loudspeaker system is proposed which comprises two soundboards which are arranged opposite one another and connected to one another. Each soundboard has an outwardly pointing front side and an inwardly pointing rear side, the respective soundboard being essentially flat. On the rear side of the respective soundboard, ribs running transversely to the longitudinal or symmetry axis are arranged, which extend essentially over the width of the soundboard extend, wherein the respective soundboard is arched transversely to the longitudinal axis by means of the ribs outward, and wherein the distance between the ribs increases along the longitudinal or symmetry axis of the soundboard. Furthermore, a web is provided on the respective soundboard, the webs being arranged opposite one another on the respective soundboard, and at least one excitation device being arranged on the surface of the respective web facing the opposite soundboard, the web being free of sound passage openings. In other words, the web has no openings. The vibration excitation of the respective flat soundboard is carried out by the respective excitation device. By connecting the two resonance bodies, which are identical in structure, they form a body of sound in addition to their respective vibrating surfaces. Through the formation of the sound body, low-frequency frequencies get a space and sound fuller and warmer. The sound volume is additionally increased by stimulating the two soundboards in the same way. The two soundboards can be connected to one another in a detachable or non-detachable manner. Due to the increasing spacing of the arrangement of the ribs from one another along the longitudinal or symmetry axis of the respective soundboard from top to bottom, different areas are created on the respective soundboard, which are better excitable for different frequencies. A small distance between the ribs improves the excitation at high frequencies, while a larger distance favors the excitation at low frequencies. The sound can be varied by a suitable choice of the distance between the ribs.

In particular, the respective soundboard can have a material thickness profile that decreases correspondingly with the increasing distance between the ribs in the longitudinal direction of the respective soundboard. The change in material thickness in the direction of the longitudinal or symmetry axis also helps to improve the excitation at high frequencies in the upper area of the respective soundboard, while in the lower area with decreasing material thickness, excitation at low frequencies is favored.

The respective web can preferably be arranged between individual elements of the respective soundboard. The individual elements of the soundboards can consist of different materials. In particular, the individual elements of the respective soundboard can consist of carbon or another comparable material. The individual elements of the respective soundboard can preferably consist of a wood, preferably softwood. If the soundboards are made of wood, the soundboards can consist of a large number of individual elements arranged parallel to one another.

Alternatively, the respective web can be arranged on the front or the rear of the respective soundboard. In the case of an arrangement of the respective bridge on the rear side of the soundboard, provision can be made for the ribs running essentially transversely to the bridge to be provided with recesses through which the continuous bridge can be passed.

According to a preferred development, the activation of the at least one excitation device on the one soundboard can take place out of phase with respect to the at least one excitation device on the opposite soundboard. In this way, the volume of the sound can be increased as possible interference can be avoided. In the simplest case, the connection of the at least one excitation device of one soundboard to a signal source can take place with reversed polarity. However, it is also conceivable that the signal source is set up to switch the polarity.

Furthermore, the respective web can consist of a hardwood. The web can be arranged between the individual elements of the respective soundboard. Particularly preferably, the respective bridge can be arranged essentially centrally on or in the soundboard. The bridge can have the same material thickness as the soundboard on which the bridge is arranged. In the case of an arrangement in the soundboard, the bridge is arranged between the individual elements. Thus, the web is flush with the surfaces of the adjacent individual elements. When placed on the front of the soundboard is this is fixed on the soundboard. The bridge ensures good sound transmission from the excitation device to as well as good and even sound propagation over the soundboard.

It is advantageous if the ribs have a curved contact surface with which the ribs rest in a form-fitting manner on the rear side of the respective soundboard. The ribs contribute to the curvature of the respective soundboard and create tension in the soundboard. The ribs extending over the web support the transmission of sound from the excitation device to and the propagation of sound over the soundboard.

The ribs extending perpendicular to the surface of the soundboards can have sections with a smaller vertical extension at the end than in the central section of the ribs, the length of the central section of a rib varying depending on the position of the rib along the course of the longitudinal or symmetry axis of the soundboard.

According to a preferred development, frame elements can be arranged on the outer edge sections of the respective soundboard, which serve to connect the soundboards at a distance. The frame elements can run essentially parallel to the longitudinal or symmetry axis of the respective soundboard, essentially following the outer contour of the soundboard. The frame elements can also be rounded to match the soundboards. The frame elements contribute to the stability of the soundboard. In particular, when the soundboard is constructed from individual elements made of wood, the frame elements contribute to the necessary stability in the grain of the soundboard.

Preferably, the mutually opposing soundboards can be closed at the end by at least one cover element. The sound body is closed at the top by the at least one cover element, so that the bass frequencies get a space and sound fuller and warmer. Alternatively, the frame elements can be designed in such a way that they close the opposing soundboards at the end like a cover element.

In particular, tensioning elements running transversely to the longitudinal axis of the soundboards can be provided between the soundboards, which have holding elements arranged at the ends on the tensioning elements, which are supported on the outside of the soundboards. The rod-shaped clamping elements can transfer pressure forces to the frame elements and the soundboards by means of the holding elements. The compressive forces exerted by the retaining elements increase the internal tension of the soundboards. This results in a larger volume of sound, which can be perceived as an increase in volume. In addition, this can prevent undesired over-resonances in the range of lower frequencies, which can be perceived as disruptive vibrations. It is furthermore conceivable that the clamping elements are designed in such a way that readjustment is made possible in order to adapt the pressure forces transmitted to the frame elements and the soundboard.

In addition, an additional tensioning element can be attached between the soundboards at at least one point of the highest curvature of the soundboards on the longitudinal axis, which creates a compressive or tensile force between the soundboards. This additional tensioning element can be provided in addition to the fine adjustment of the tensions caused by the rod-shaped tensioning elements.

According to a preferred development, a substantially annular receiving element can be provided for the arrangement of the at least one excitation device on the respective web, which has pins arranged distributed in the circumferential direction, which extend coaxially to the longitudinal axis of the receiving element. The receiving element is attached to the web by means of the pins. The pins can anchor the receiving element in the web. For attachment, the position of the pins can be transferred to the web and at these points pre-drilling. The diameter of the pilot holes should be smaller than the pin diameter. In this way, a frictional connection between the web and pins can be brought about for a tight fit of the receiving element. The annular receiving element can vary in height. Due to the receiving element, the excitation device is arranged at a distance from the bridge or the soundboard.

In this case, the receiving element can be provided with an essentially annular receiving section which has a surface which corresponds to the contact surface of the excitation device. The receiving section can be designed as a ring made of metal, wood, plastic or carbon. Depending on the material used, the receiving element can assume the function of a frequency filter. When using different materials for the recording section, the frequency response in the range of high and low frequencies can be influenced. This is particularly advantageous when more than one excitation device is arranged on the respective web of a soundboard.

Furthermore, the pins made of a metal can have a length so that the pins penetrate at least in sections into the web in the mounted position of the receiving element. Anchoring of the receiving element is achieved by the pins penetrating at least in sections into the web. In addition, it can be provided that the pins penetrate the web, so that the ends of the pins are flush with the outside of the web. In the case of a length that exceeds the material thickness of the web, the protruding ends of the pins can be removed in such a way that they are essentially flush with the surface. The advantage of this type of attachment of the excitation device by means of the receiving element is that precisely the high frequencies are transported to the outside, ie the respective front side of the soundboards, through the receiving element. This creates a more direct access to the music being heard. The effect that the sound source, ie the excitation device, is enclosed in the interior of the loudspeaker system, which has no sound outlet opening, is thereby largely canceled out.

According to an advantageous development, it can be provided that in the respective web the number of excitation devices to be mounted, individual segments are cut out, in which prefabricated web segments can be inserted, on which the receiving elements were arranged in a previous manufacturing step. In this way, the positioning of the receiving elements can take place at a later point in time independently of the production of the soundboards. The web segments can be made of the same material as the web. But it is also conceivable to make them from another material, such as. B. wood, plastic or carbon. The excitation devices can be attached to the respective receiving elements both before and after the insertion of the prefabricated web segments. Both the fixing of the prefabricated web segments in the webs and the fastening of the excitation devices can preferably take place by means of an integral connection.

Furthermore, according to the invention, an arrangement of a loudspeaker system according to one of claims 1 to 13 in a cavity of a wall section of interior spaces is proposed, a surface on the front side of the soundboard to be flush with the surface of the wall section delimiting the cavity by means for height compensation at the same level is brought. This enables a flush arrangement, for example in a drywall.

For this purpose, a frame can be arranged as a means for height compensation on the surface of the soundboard closing with the wall surface, which frame projects beyond the surface at the point of the highest curvature of the soundboard and serves as a fastening for a flat material. A film, a fabric or a light and inherently stable panel material can be provided as the flat material. For example, with a foaming adhesive and finally with a glass fiber wallpaper on a flat surface, the difference in height caused by the curvature of the soundboard can be leveled out.

The loudspeaker system enables operation as a mono loudspeaker system in that the stereo signals from a signal source of the left channel of the at least one excitation device of one soundboard and the stereo signal of the right channel of the at least one excitation device of the opposite soundboard are fed to the individual loudspeaker system. If several excitation devices are arranged on the respective web, they are connected in series or in parallel, depending on the power of the signal source. The control of one channel in relation to the other channel is out of phase. For example, a reversal of the connection polarity can be provided for this.

Alternatively, operation as a stereo loudspeaker system can be provided in that two loudspeaker systems according to the invention are provided, which are controlled by a common signal source. In one speaker system, the stereo signals of the left channel coming from the signal source are fed to the excitation devices of both soundboards and in the second speaker system the stereo signals of the right channel coming from the signal source are fed to the excitation devices of both soundboards. The activation of the at least one excitation device of the one soundboard is also out of phase with respect to the at least one excitation device of the opposite soundboard of the respective loudspeaker system.

The present invention is explained in more detail below with reference to an exemplary embodiment shown in the drawings.

Fig. 1

eine schematische Ansicht eines Lautsprechersystems von schräg vorne;

Fig. 2

eine Explosionsansicht eines Resonanzbodens des Lautsprechersystems;

Fig. 3

eine Ansicht eines komplementären Resonanzbodens des Lautsprechersystems gemäß Fig. 1;

Fig. 4

eine Detailansicht des Resonanzbodens gemäß Fig. 2 mit einem Spannelement;

Fig. 5

eine Explosionsansicht eines Steges mit einem Aufnahmeelement und einer Erregereinrichtung;

Fig. 6

eine Seitenansicht des Steges mit dem darauf montierten Aufnahmeelement gemäß Fig. 5;

Fig. 7

eine Teilansicht des Steges gemäß Fig. 6 von schräg vorne.

Show it:

Fig. 1

a schematic view of a speaker system obliquely from the front;

Fig. 2

an exploded view of a soundboard of the speaker system;

Fig. 3

a view of a complementary soundboard of the loudspeaker system according to FIG Fig. 1 ;

Fig. 4

a detailed view of the soundboard according to Fig. 2 with a clamping element;

Fig. 5

an exploded view of a web with a receiving element and an excitation device;

Fig. 6

a side view of the web with the receiving element mounted thereon according to Fig. 5 ;

Fig. 7

a partial view of the web according to Fig. 6 from diagonally in front.

In Fig. 1 is a view of a speaker system 1 shown obliquely from the front. The loudspeaker system 1 comprises two soundboards 2 which are arranged opposite one another and connected to one another. The two soundboards 2 are constructed identically so that the following description of one soundboard 2 also applies to the other soundboard 2. The respective front side of the soundboard 2 is designated by V, and the inner rear side of the respective soundboard 2 is designated below by R. At one end of the mutually opposite soundboard 2, referred to as the top, a cover element 3 is provided which closes the loudspeaker system 1 at the end. The representation in Fig. 1 a web 4 which is arranged between at least two individual elements 5 of the soundboard 2. The surfaces of the bridge 4 and the adjacent individual elements 5 of the soundboard 2 are flush with one another, so that an essentially flat outer surface is formed on the front side V of the respective soundboard 2. The outer surfaces of the soundboards 2 are curved outwards. Signals from a signal source are fed to the loudspeaker system 1 by means of two signal lines 22a, 22b and 23a, 23b arranged in pairs. The positive and negative polarity of the signal lines 22a and 23b or 22b and 23a is indicated by a plus sign and a minus sign.

The representation in Fig. 2 shows an exploded view of one of the soundboards 2 of the loudspeaker system 1. The individual elements 5 of the soundboard 1 consist in particular made of wood, preferably made of a softwood, which is characterized by good vibration behavior. For this purpose, a plurality of individual elements 5 arranged next to one another is provided, which are glued together. The individual elements 5 are arranged in such a way that a substantially uniform fiber course is created in the longitudinal direction of the soundboard 2. Alternatively, the at least two individual elements 5 can consist of a different material, such as, for example, carbon. The web 4 is arranged between the individual elements 5.

On the rear side R of the soundboard 2, arcuate ribs 6 running transversely to the longitudinal or symmetry axis 11 are arranged, which extend essentially over the width of the soundboard 2. By means of the ribs 6, the soundboard 2 is arched outwards transversely to the symmetry or longitudinal axis 12. The ribs 6 are made of a softwood. The arrangement of the ribs 6 takes place at right angles to the grain of the soundboard 2 when the individual elements 5 are made of wood. In order to arch the soundboard 2, the respective ribs 6 have a curved contact surface 7 with which the ribs 6 rest in a form-fitting manner on the surface of the rear side R of the soundboard 2.

Frame elements 12, which serve to connect the soundboards 2 at a distance, are arranged on the outer edge sections of the respective soundboard 2. The two frame elements 12 extend essentially parallel to the longitudinal axis 11 of the soundboard 2. The frame elements 12 on the outer edge of the soundboard 2 bring about the necessary stability in the grain of the soundboard 2, which is made in particular of wood. The height of the opposing frame elements 12 of the respective soundboard 2 ensures the necessary distance between the two soundboards 2.

Furthermore, tensioning elements 8 running transversely to the longitudinal axis 11 of the soundboards 2 are provided between the soundboards 2, which have holding elements 9 arranged at the ends, which are supported on the outside of the soundboards 2 or the frame elements 12. The rod-shaped clamping elements 8 are received in sections by half-shell-shaped recesses 13 in the frame elements 12 of the respective soundboard 2. Thereby the clamping elements 8 are framed in a form-fitting manner between the soundboards 2 in the assembled state of the storage system 1. The holding elements 9 arranged at the ends are supported flat on the frame elements 12. The tensioning elements 8 running inside the loudspeaker system 1 generate pressure from the outside on the frame elements 12 and the soundboard 2 through the holding elements 9, which can be designed as solid iron plates, for example, and thus additionally increase the internal tension of the respective soundboard 2 A tensioning element can be attached to the soundboards 2 at at least one point of the highest curvature on the longitudinal axis 11, which tension element generates a compressive or tensile force between the soundboards 2.

At least one excitation device 10 is arranged on the web 4, which preferably consists of a hardwood. The web 4 is free of sound passage openings. The vibration excitation of the respective, essentially flat soundboard 2 is carried out by the respective excitation device 10. The activation of the respective excitation device 10 of one soundboard 2 can be out of phase with respect to the respective excitation device 10 of the opposite, mirror-inverted soundboard 2. In the exemplary embodiment shown, this is achieved by reversing the connection polarity, as in FIG Fig. 1 indicated, achieved.

In Fig. 3 FIG. 3 is a view of the complementary soundboard 2 of the speaker system 1 of FIG Fig. 1 shown in assembled condition. The ribs 6 extending perpendicular to the surface of the soundboard 2 have ends with sections with a smaller vertical extent than in the middle section of the ribs 6. The length of the middle section of a rib 6 varies depending on the position of the rib 6 in the longitudinal direction of the soundboard 2. The respective soundboard 2 has a material thickness profile which decreases correspondingly with the increasing distance between the ribs 6 in the longitudinal direction of the soundboard 2. The positioning of the ribs 6 with increasing distance in the course of the soundboard 2 in its longitudinal direction from top to bottom forms different areas that are better excitable for different frequencies. A a small distance between the ribs 6 favors the excitation of the soundboard 6 at high frequencies, while a wider distance between the ribs 6 is advantageous for low frequencies. A material thickness profile in the soundboard 2 from approx. 9 mm at the top to approx. 6 mm at the bottom supports this aspect. The web 4 has a corresponding material thickness profile. In principle, the respective soundboard 2 and the web 4 arranged on the respective soundboard 2 can also have a constant material thickness profile.

The representation in Fig. 4 shows a detailed view of the soundboard 2 according to FIG Fig. 2 with the clamping element 8. The holding element 9 rests flat on the frame elements 12 in the assembled position, so that compressive forces can be transmitted from the rod-shaped clamping element 8 to the frame elements 12 or the adjacent soundboards 2, which cause additional tension. It is conceivable that the holding elements 9 are designed to be readjustable on the clamping element 8 by means of a threaded section.

In Fig. 5 an exploded view of the web 4 with a substantially annular receiving element 16 and the excitation device 10 positioned in the interior of the loudspeaker system 1 is shown. The web 4 is provided with a cutout 14 for the simplified reception of the respective excitation device 10. In the cutout 14, a web segment 15 is positively inserted, which serves to receive a receiving element 16 and completely closes the surface of the web 4. The web segment 15 to be used consists of the same material as the web 4. Alternatively, the cutout 14 of the web 4 can be dispensed with. In this case, the receiving element 16 is fastened directly on the web 4. The attachment of the receiving element 16 takes place in an almost identical manner.

The receiving element 16 is provided with an essentially annular section 17. Pins 18 extending coaxially to the longitudinal axis 20 of the receiving element 16 are arranged on the annular section 17. The pins 18 are arranged distributed essentially uniformly over the circumference of the receiving element 16. The pins 18 made of a metal have a length which corresponds at least to the material thickness of the web 4 at the respective point at which the receiving element 16 is mounted.

The annular section 17 has a surface which corresponds to an end-side support surface 21 of the excitation device 10. The excitation device 10 is preferably permanently connected to the annular section 17 of the receiving element 16 by gluing. The respective web segment 15 is provided with a number of through bores 19 corresponding to the number of pins 18 of the receiving element 16. The diameter of the through bores 19 is selected to be smaller than the diameter of the pins 18. Thus, a frictional connection between the web segment 15 and the pins 18 can be brought about for a tight fit of the receiving element 16. The annular section 17 of the receiving element 16 has a height of approximately 0.5 cm to 1 cm, particularly preferably 0.6 cm to 0.8 cm.

The pins 4 have a length in which they penetrate at least in sections into the web 4 when the receiving element 16 is mounted on the web 4. Because the length of the pins 18 corresponds at least to the material thickness of the web 4, it is achieved that the free ends of the pins 18 are flush with the outside surface of the web 4. If the length of the pins 18 exceeds the material thickness of the web 4, the protruding ends of the pins 18 are removed in such a way that they are essentially flush with the surrounding surface. The advantage of this type of attachment of the excitation device 10 by means of the receiving element 16 is that precisely the high frequencies are transferred to the outside, i.e. respective front side V, the soundboards 2 are transported. This creates a more direct access to the music being heard. The effect that the excitation device 10 is located inside the loudspeaker system 1 is largely canceled out.

In Fig. 6 FIG. 14 is a side view of the web 4 with the receiving element 16 according to FIG Fig. 5 shown. The exciter device 10 glued to the receiving element 16 transmits the vibrations directly through the annular section 17 and the pins 18 to the web segment 15 or the web 4 Mounting the receiving element 16 on a prefabricated web segment 15 has the advantage that the excitation device 10 can be glued independently of the construction of the soundboard 2. The position of the receiving elements 16 and the exciter devices 10 attached to them on the respective web 4 of the soundboards 2 can be determined at a later point in time, in which case the attachment can then take place with wood glue in a time-saving manner.

Fig. 7 shows a partial view of the web according to Fig. 6 from diagonally in front. The surface of the web segment 15 is flush with the surface of the web 4. The pins 18 are shortened accordingly, if necessary, so that their ends are also almost flush with the surface of the web segment 15 or of the web 4.

List of reference symbols

1

Speaker system

2

Soundboard

3

Cover element

4th

web

5

Single element

6th

rib

7th

Contact surface

8th

Clamping element

9

Retaining element

10

Excitation device

11

Longitudinal axis

12

Frame element

13

Recess

14th

Cutout

15th

Bar segment

16

Receiving element

17th

section

18th

pen

19th

Through hole

20th

Longitudinal axis

21st

Support surface

22a

Signal line

22b

Signal line

23a

Signal line

23b

Signal line

Claims (15)

1. Loudspeaker system (1) comprising two soundboards (2), which are arranged opposite one another and are connected to one another,

   - wherein each soundboard (2) has a respective outwardly oriented front side (V) and an inwardly oriented rear side (R),

   - wherein the respective soundboard (2) is of laminary design,

   - wherein the rear side (R) of the respective soundboard (2) has arranged on it ribs (6) which run transversely in relation to the axis of symmetry or along the longitudinal axis (11) and extend essentially over the width of the soundboard (2),

   - wherein the respective soundboard (2) is curved outwards in a direction transverse to the longitudinal axis (11) by means of the ribs (6),

   - wherein the distance between the ribs (6) increases in the longitudinal direction of the soundboard (2),

   - wherein a respective bar (4) is provided on the respective soundboard (2), wherein the bars (4) are positioned opposite one another on the soundboards (2), and

   - wherein at least one exciter device (10) is arranged on that surface of the respective crosspiece (4) which is directed towards the opposite soundboard (2), wherein the bar (4) is designed to be free of sound transmission openings.
2. Loudspeaker system (1) according to Claim 1, characterized in that the respective soundboard (2) has a material-thickness progression which decreases in a manner corresponding with the increasing distance between the ribs (6) in the longitudinal direction of the respective soundboard (2) .
3. Loudspeaker system (1) according to Claim 1 or 2, characterized in that the respective bar (4) is arranged between individual elements (5) of the respective soundboard (2).
4. Loudspeaker system (1) according to Claim 1 or 2, characterized in that the respective bar (4) is arranged on the front side (V) or the rear side (R) of the respective soundboard (2).
5. Loudspeaker system (1) according to one of Claims 1 to 4, characterized in that the at least one exciter device (10) on the one soundboard (2) is activated in a phase-shifted manner in relation to the at least one exciter device (10) on the opposite soundboard (2).
6. Loudspeaker system (1) according to one of Claims 1 to 5, characterized in that the ribs (6) have a curved abutment surface (7), by way of which the ribs (6) butt in a form-fitting manner against the rear side (R) of the respective soundboard (2).
7. Loudspeaker system (1) according to one of Claims 1 to 6, characterized in that the ribs (6), which extend perpendicularly in relation to the surface of the soundboards (2), have end portions with a vertical extent which is smaller than in the central portion of the ribs (6), wherein the length of the central portion of a rib (6) varies in dependence on the position of the rib (6) in the longitudinal direction of the soundboard (2).
8. Loudspeaker system (1) according to one of Claims 1 to 7, characterized in that frame elements (12) are arranged on outer peripheral portions of the respective soundboard (2) and serve to connect the soundboards (2) in a spaced-apart manner.
9. Loudspeaker system (1) according to one of Claims 1 to 8, characterized in that the soundboards (2) arranged opposite one another are closed at the ends by at least one cover element (3).
10. Loudspeaker system (1) according to one of Claims 1 to 9, characterized by the provision, between the soundboards (2), of stressing elements (8) which run transversely in relation to the longitudinal axis (11) of the soundboards (2) and have retaining elements (9), which are arranged at the ends of the stressing elements (8) and are supported on the outside of the soundboards (2).
11. Loudspeaker system (1) according to one of Claims 1 to 10, characterized by the provision, for the purpose of arranging the at least one exciter device (10) on the respective bar (4), of a respective essentially annular accommodating element (16) having circumferentially distributed pins (18), when extend coaxially in relation to the longitudinal axis (20) of the accommodating element (16) .
12. Loudspeaker system (1) according to Claims 11, characterized in that the accommodating element (16) is provided with an annular portion (17) which has a surface area which corresponds to a bearing surface (21) of the exciter device (10).
13. Loudspeaker system (1) according to Claims 11 or 12, characterized in that the pins (18), which consist of a metal, are of such a length that, when the accommodating element (16) is in the fitted position, the pins (18) penetrate at least partially into the bar (4).
14. Arrangement of a loudspeaker system (1) according to one of Claims 1 to 13 in a cavity of a wall portion in indoor spaces, characterized in that a surface on the front side (V) of the soundboard (2), in order to terminate flush with the cavity-delimiting surface of the wall portion, is brought to the same level by height-compensating means.
15. Arrangement of a loudspeaker system (1) according to Claim 14, characterized in that the height-compensating means is provided in the form of a frame on that surface of the soundboard (2) which terminates at the wall surface, and said frame projects beyond the surface at the point of highest curvature of the soundboard (2) and serves as a fastening for a sheet-like material.

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