JP2009147951

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DESCRIPTION JP2009147951
A speaker system using a constant directional horn used in combination with a box speaker
incorporating a woofer unit, to obtain constant directivity even at lower frequencies. A speaker
system 10 includes an enclosure 20, a first speaker unit 30 for low frequency, and a plurality of
second speaker units 31, 32 and 33 for high frequency. The enclosure 20 has a front plate
portion 21 as a baffle plate and a rear plate portion 22. The length of the rear plate portion 22 in
the first direction orthogonal to the front-rear direction is shorter than the length of the front
plate portion 21 in the first direction. The first speaker unit 30 and the second speaker units 31,
32, 33 are attached to the front plate portion 21. The plurality of second speaker units 31, 32,
and 33 are arranged in parallel along the first direction. The diaphragms of the plurality of
second speaker units 31, 32, and 33 are located in the vicinity of the front plate portion 21 in the
front-rear direction. [Selected figure] Figure 1
Speaker system and speaker cluster system
[0001]
The present invention relates to a speaker system and a speaker cluster system that can obtain
fixed directivity in a wider frequency range and can obtain fixed directivity at lower frequencies.
[0002]
For example, in order to provide sound in a space (sound space) having a certain size such as an
airport lobby, a speaker system designed to obtain a certain directivity in a certain frequency
range is used. Sometimes.
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A typical example of such a speaker system is a speaker system using a constant directivity horn
(constant directivity horn) (see, for example, Non-Patent Document 1).
[0003]
Loudspeaker systems using directed horns are often used in combination with box speakers
configured by attaching a woofer unit to a cabinet. According to such a speaker system, relatively
stable directivity control is performed in the frequency band provided by the constant directivity
horn. That is, constant directivity can be obtained in a relatively wide frequency range.
[0004]
However, in many cases, a speaker system using a constant directional horn and a box speaker
having a woofer unit are connected by a fitting or the like. Combinations configured in this
manner are large in size and complicated in overall shape. Therefore, installation work in
acoustic space is not easy.
[0005]
There is also a need for a speaker system that is more compact than a regular directional horn
and that can provide constant directivity over a wider frequency range.
[0006]
On the other hand, a box-type speaker system in which a woofer and a tweeter are attached to a
cabinet may be used.
This tweeter is a type of tweeter having a horn. In such a speaker system, since the woofer and
the tweeter are attached to the cabinet, the installation work in the acoustic space is easy.
Moreover, since the woofer and the tweeter are stored in the cabinet, a preferable design is
presented. However, since the tweeter horn is relatively small, the directivity control can not be
stably performed in a frequency band as wide as that of the constant directivity horn.
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[0007]
Tamon Saeki, "New Edition Speaker & Enclosure Encyclopedia", (Japan), Seibundo Shinkosha Co.,
Ltd., May 28, 1999, p. 36-37
[0008]
An object of the present invention is to provide a speaker system and a speaker cluster system
which can obtain a certain directivity over a wide frequency range despite being compact.
[0009]
In order to solve the above-mentioned subject, a speaker system concerning the present
invention is provided with an enclosure, the 1st speaker unit, and a plurality of 2nd speaker
units, and this enclosure is a front board part as a baffle board, a back board And a length of the
rear plate portion along a first direction orthogonal to the front and rear direction is shorter than
a length of the front plate portion along the first direction, and the first speaker unit , The second
speaker unit amplifies the voice in the frequency band higher than the predetermined frequency,
and the first speaker unit and the plurality of the second speaker units And the plurality of
second speaker units are arranged in parallel along the first direction, and the diaphragms of the
plurality of second speaker units are provided in the front plate portion in the front-rear
direction. Located nearby .
[0010]
According to such a speaker system, since the second speaker units for the high frequency band
are juxtaposed along the first direction, a wave front (in-phase plane) along the front plate is
formed.
By arranging a plurality of such speaker systems adjacent in the first direction, a smooth
wavefront can be formed in a frequency range from low frequency to high frequency, and
constant directivity can be obtained.
[0011]
In order to solve the above-mentioned subject, a speaker cluster system concerning the present
invention is provided with a plurality of speaker systems, and each of a plurality of speaker
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systems is the above-mentioned speaker system, and a plurality of speaker systems are arranged
in a line. The front plate portions of the plurality of speaker systems are juxtaposed along a
curved line, and the juxtaposed direction coincides with the first direction in each of the speaker
systems.
[0012]
According to such a speaker cluster system, a smooth wavefront having a shape close to the
shape of the entire front plate portion of the plurality of speaker systems is formed.
Therefore, constant directivity can be obtained over a wide frequency range.
[0013]
According to the present invention, constant directivity can be obtained over a wider frequency
range.
Further, the directivity angle can be arbitrarily set in a predetermined angle range.
[0014]
It is a figure of a speaker system, (a) is the front view, (b) is a top view, (c) is a side view.
It is an II-II arrow directional cross-sectional view of FIG. It is an external view of a speaker
cluster system. It is a figure which shows the external appearance of a speaker system and a
connection means. It is a figure showing gradually the procedure of connecting the front of two
speaker systems by the front side connection bracket. It is a figure which shows typically the
state which two speaker systems were connected by the front side connection metal fitting etc.
FIG. It is a figure which shows the method of connecting the rear of two speaker units by a rear
side connection part. It is a front view of a speaker cluster system. It is a top view of a speaker
cluster system. It is a partial cross section view of a speaker cluster system, (a) shows the cross
section containing a tweeter unit, (b) shows the cross section containing a woofer unit. It is a
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figure which shows the measurement result of a directivity angle frequency characteristic. It is a
figure of a fixed directivity horn, (a) is its front view, (b) is its top view, (c) is its side view. It is a
figure which shows the measurement result of a directivity angle frequency characteristic. It is a
top view of a speaker cluster system. It is a figure which shows the measurement result of a
directivity angle frequency characteristic. It is a top view of a speaker cluster system. It is a top
view of a speaker cluster system. It is a top view of a speaker cluster system. It is sectional
drawing which shows the arrangement ¦ positioning state of three tweeter units in a speaker
system. FIG. 2 is a plan view of the speaker system 10; It is a cross-sectional view of the speaker
system 10 which overlapped and represented the front side connection metal fitting. FIG. 6 is a
plan view of two speaker systems connected by a first connection fitting and a second connection
fitting. It is a top view of two speaker systems connected by the connection means which can
change the angle between the speaker systems which adjoin within predetermined angle range
centering on a virtual pivot. It is a figure which shows the state in which the speaker system was
closely attached to the wall surface, and was attached. It is a figure which shows the state in
which the combination body of a fixed directivity horn and the cabinet incorporating a woofer
was closely attached to the wall surface. It is a figure which shows the state in which the speaker
cluster system was closely attached to the wall surface, and was attached.
[0015]
In the above speaker system, the speaker system includes connection means, and the connection
means is an end of the front plate of the speaker system in the first direction and an end of the
front plate of the other speaker system in the first direction. The two speaker systems may be
configured to be coupled along the first direction such that the two speaker systems are close to
each other. According to this configuration, even when a plurality of speaker systems are
arranged adjacent to each other in the first direction, the peak or dip on the directivity pattern
due to the interference between the sound waves from the two adjacent speaker systems can be
reduced. it can.
[0016]
Further, in the above speaker system, the connection means has a front connection portion, and
the front connection portion has a pivot support portion having a central axis extending in a
longitudinal direction and a second direction orthogonal to the first direction, The pivot support
may be located near an end of the front plate in the first direction. Furthermore, in the above
speaker system, it is desirable that the connecting means be capable of changing an angle with
the other speaker system within a predetermined angle range around the pivot support.
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Furthermore, in the above speaker system, it is preferable that a distance in the front-rear
direction between the central axis of the pivot support portion and the front surface of the front
plate portion be 20 mm or less. Furthermore, in the above speaker system, it is desirable that the
central axis of the pivot support portion be located forward of the front surface of the front plate
portion.
[0017]
In the above speaker cluster system, each of the plurality of speaker systems may be configured
as a speaker system having the pivot support. According to this configuration, the connection
angle between two adjacent speaker systems can be freely set in a predetermined angle range.
Therefore, the directivity angle of the speaker cluster system configured by connecting a
plurality of speaker systems can be arbitrarily set within a predetermined angle range. In
addition, since the pivot support portion is located near the end of the front plate portion, the
first speaker unit of the two speaker systems and the first speaker unit of the two speaker
systems can be connected regardless of the connection angle of the two adjacent speaker
systems. , The second speaker unit does not separate greatly. Thus, a smooth wavefront can be
obtained.
[0018]
Furthermore, in the above-described speaker system, the connection means may be configured to
have the front connection portion at one end side, the other end side, or both end sides in the
first direction.
[0019]
Further, in the above-described speaker system, the connection means may be configured to have
the front connection portion at one end side, the other end side or both end sides in the second
direction.
[0020]
Further, in the above speaker system, the connection means has a virtual pivot extending in a
front-rear direction and a second direction orthogonal to the first direction, the virtual pivot
being an end of the front plate in the first direction. The connection means may be arranged to
be able to change the angle with the other speaker system within a predetermined angle range
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around the virtual pivot axis.
Furthermore, in the above speaker system, it is desirable that the distance in the front-rear
direction between the virtual pivot and the front surface of the front plate be 20 mm or less.
Furthermore, in the above speaker system, it is desirable that the virtual pivot be located forward
of the front surface of the front plate. Further, in the above speaker system, the connection
means may have the virtual pivot at one end side, the other end side or both end sides in the first
direction.
[0021]
Furthermore, in the above-described speaker system, the connection means has a rear side
connection portion, the rear side connection portion has a reinforcing member, the reinforcing
member is made of metal, and the reinforcing member is along the first direction. Is substantially
equal to the length of the back plate in the first direction, and the reinforcing member is disposed
near the back plate at both ends in the first direction of the back plate. It may be configured to be
attached to the enclosure so as to be located near both ends in the first direction. According to
this structure, when a speaker cluster system is to be configured by arranging a plurality of
speaker systems adjacent to each other, two adjacent speaker systems can be connected via a
metal reinforcing member. Then, the enclosure is reinforced by the reinforcing member.
[0022]
In the above-described speaker cluster system, the curve may be configured to be a circular arc.
In this way, it is possible to form an arc-shaped smooth wavefront.
[0023]
Furthermore, in the above-described speaker system, all the center-to-center distances of two
adjacent second speaker units among the plurality of second speaker units may be configured to
be 60 mm or less. Further, in the above speaker cluster system, by arranging the plurality of
speaker systems in parallel, a second speaker unit row is formed, and a distance between centers
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of two adjacent second speaker units in the second speaker unit row is provided. You may
comprise so that all may be 60 mm or less. If comprised in this way, the peak and dip on the
directivity pattern by interference of the sound waves from a several 2nd speaker unit can be
reduced.
[0024]
Furthermore, in the above-described speaker system, all the center-to-center distances of two
adjacent second speaker units among the plurality of second speaker units may be substantially
equal. Further, in the above speaker cluster system, by arranging the plurality of speaker systems
in parallel, a second speaker unit row is formed, and a distance between centers of two adjacent
second speaker units in the second speaker unit row is provided. You may comprise so that all
may be substantially equal.
[0025]
Furthermore, in the above-described speaker system, all of the intervals between adjacent two
second speaker units among the plurality of second speaker units may be configured to be
shorter than the aperture of the second speaker unit. According to this configuration, it is
possible to reduce the influence of the interference between the sound waves from the plurality
of second speaker units, and to reduce the peaks and dips on the directivity pattern.
[0026]
Furthermore, in the above-described speaker system, an equalizer may be provided in front of
the second speaker unit of at least one of the plurality of second speaker units. With this
configuration, the wave fronts of the sound waves from the plurality of second speaker units
become smoother.
[0027]
Furthermore, in the above-described speaker system, an equalizer may be provided in front of
substantially all of the second speaker units among the plurality of second speaker units.
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[0028]
Furthermore, in the above-described speaker system, three or more second speaker units may be
provided.
[0029]
Furthermore, in the above-described speaker system, the plurality of second speaker units may
be arranged in parallel along the convex arc.
With such a configuration, the vibration surface of one speaker system has an arc shape.
Therefore, when a speaker cluster system is configured by arranging a plurality of speaker
systems adjacent to each other, a larger arc-shaped vibrating surface that vibrates in a certain
radial direction is formed, and constant directivity is given in an angle range determined by the
central angle and radius of the arc. You can get sex.
[0030]
Furthermore, in the speaker system, the enclosure preferably includes one side plate portion and
the other side plate portion in the first direction, and an angle between the one side plate portion
and the other side plate portion is preferably 15 degrees or more. .
[0031]
Further, in the above speaker cluster system, the plurality of speaker systems are juxtaposed to
form a first speaker unit row, and a distance between centers of two adjacent first speaker units
in the first speaker unit row is provided. You may comprise so that all may be 140 mm or less.
If comprised in this way, the peak and dip on the directivity pattern by interference of the sound
waves from a several 1st speaker unit can be reduced.
[0032]
Further, in the above speaker cluster system, the plurality of speaker systems are juxtaposed to
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form a first speaker unit row, and a distance between centers of two adjacent first speaker units
in the first speaker unit row is provided. You may comprise so that all may be substantially equal.
[0033]
Furthermore, in the above-mentioned speaker cluster system, each of the plurality of speaker
systems is the speaker system according to claim 2, and the connection means includes one or
more connection members made of metal, and the plurality of the connection units are arranged
in parallel. A bridging means is formed by the one or more linking members so as to bridge
without interruption between the speaker system disposed at one end of the speaker system and
the speaker system disposed at the other end. It is also good.
Furthermore, in this speaker cluster system, the bridging means may be formed by connecting a
plurality of the connecting members, and each of the plurality of connecting members may be
configured to connect two adjacent speaker systems. With such a configuration, the speaker
system can strongly connect the plurality of speaker systems.
[0034]
Hereinafter, a speaker system and a speaker cluster system according to an embodiment of the
present invention will be described with reference to the drawings.
[0035]
FIG. 1 is a diagram of a speaker system 10, wherein (a) is a front view thereof, (b) is a plan view
thereof, and (c) is a side view thereof.
The general dimensions of this loudspeaker system 10 are described in FIG.
[0036]
The speaker system 10 includes an enclosure 20, a woofer unit 30, which is a first speaker unit,
and tweeter units 31, 32, and 33, which are second speaker units.
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[0037]
The enclosure 20 includes a front plate portion 21 as a baffle plate, a rear plate portion 22, a left
side plate portion 23, a right side plate portion 24, a top plate portion 25, and a bottom plate
portion 26.
An enclosure 20 is configured with these plate portions as outer wall portions.
[0038]
The width of the rear plate portion 22 is narrower than that of the front plate portion 21. The left
side plate portion 23 and the right side plate portion 24 are interposed between the front plate
portion 21 and the rear plate portion 22. As understood from FIG. 1 (b), the left side plate
portion 23 and the right side plate portion 24 are substantially flat. The left and right side plate
portions 23 and 24 are disposed to open forward. As understood from FIG. 1 (b), the plan view
shape of the enclosure 20 is substantially trapezoidal.
[0039]
The woofer unit 30 and three tweeter units 31, 32, and 33 are attached to the front plate portion
21. As understood from FIG. 1 (a), the distance in the vertical direction between the center of the
woofer unit 30 and the centers of the tweeter units 31, 32, 33 is 120 mm. This distance is
preferably 120 mm or less.
[0040]
The three tweeter units 31, 32, 33 are mounted above the woofer unit 30. An opening 27 is
formed in the front plate portion 21 of the enclosure 20 at a position above the tweeter units 31,
32, 33. The opening 27 is an outlet opening of the bass reflex port.
[0041]
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A dividing network is incorporated inside the enclosure 20. The crossover frequency is
approximately 2500 Hz. The woofer unit 30 amplifies voice in a frequency range from 120 Hz to
2500 Hz. The tweeter units 31, 32, 33 amplify voice in a frequency range from 2500 Hz to 20
kHz.
[0042]
FIG. 2 is a cross-sectional view taken along line II-II in FIG. The structure of the three tweeter
units 31, 32, 33 can be better understood by FIG. The three tweeter units 31, 3 and 2 all have
the same structure. The aperture size of the three tweeter units 31, 32, 33 is approximately 34
mm.
[0043]
The three tweeter units 31, 32, 33 are arranged in parallel along the left-right direction of the
front plate portion 21. The left and right direction in the present embodiment is a first
direction orthogonal to the front and back direction , and the width direction is a
direction coincident with the left and right direction .
[0044]
The three tweeter units 31, 32, and 33 are arranged at substantially equal intervals.
[0045]
The distance between the tweeter unit 31 and the tweeter unit 32, and the distance between the
tweeter unit 32 and the tweeter unit 32 are both approximately 6 mm.
This interval (approximately 6 mm) is equal to or less than the aperture (approximately 34 mm)
of the tweeter units 31, 32, 33, and is half or less than the aperture (approximately 34 mm) of
the tweeter units 31, 32, 33. It is also a length.
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[0046]
Thus, the distance between two adjacent tweeter units is shortened in order to bring the wave
fronts of the sound waves from the three tweeter units 31, 32, 33 closer to a more straight wave
front. The purpose of forming a linear wave front is to reduce peaks and dips on the directivity
pattern that are caused by the interference of sound waves from the three tweeter units 31, 32
and 33 of one speaker system 10. Furthermore, it is also for reducing the peak and dip on a
directivity pattern by interference of the sound waves from the tweeter unit of the several
speaker system 10 used adjacently.
[0047]
The distance between the central axis 31a of the tweeter unit 31 and the central axis 32a of the
tweeter unit 32, and the distance between the central axis 32a of the tweeter unit 32 and the
central axis 33a of the tweeter unit 33 are both approximately 40 mm. That is, in the speaker
system 10, all the distances between the centers of two adjacent tweeter units are 40 mm. The
center-to-center distance is preferably designed to be 60 mm or less.
[0048]
The reason for shortening the distance between the centers of two adjacent tweeter units in this
way is to bring the wave fronts of the sound waves from the three tweeter units 31, 32, 33 closer
to a more linear wave front.
[0049]
The most left of the three tweeter units 31, 32, and 33 is the tweeter unit 33.
The left end of the tweeter unit 33 is located near the left end of the front plate portion 21. The
rightmost disposed one of the three tweeter units 31, 32, and 33 is the tweeter unit 31. The right
end of the tweeter unit 31 is located near the right end of the front plate portion 21. The tweeter
unit 32 is located substantially at the center between the tweeter unit 31 and the tweeter unit
33.
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[0050]
The reason why the plurality of tweeter units 31, 32, and 33 are disposed over substantially the
entire width of the front plate portion 21 is to bring the wave front of the sound waves from the
tweeter units 31, 32, and 33 closer to a more straight wave front. In particular, this is to reduce
peaks and dips on the directivity pattern due to interference between sound waves from the
tweeter units of the two speaker systems 10 used adjacent to each other.
[0051]
The diaphragms 31b, 32b, and 33b of the tweeter units 31, 32, and 33 are positioned in the
vicinity of the front plate portion 21 in the front-rear direction.
[0052]
In each of the tweeter units 31, 32, 33, equalizers 31c, 32c, 33c are provided in front of the
diaphragms 31b, 32b, 33b.
The paths of the sound waves radiated from the diaphragms 31b, 32b and 33b are changed by
the equalizers 31c, 32c and 33c, and a wavefront as shown by a two-dot chain line 37 is formed.
That is, by the action of the equalizers 31c, 32c, and 33c, the wave front of the sound waves from
the tweeter units 31, 32, and 33 can be made closer to a more straight wave front.
[0053]
FIG. 3 is an external view of a speaker cluster system 40 configured by combining four speaker
systems 10 shown in FIG. The speaker cluster system 40 is configured by connecting four
speaker systems 10. The four speaker systems 10 are juxtaposed in a line along the left-right
direction, and their front plate portions 21 are generally aligned along a circular arc. When a
plurality of speaker systems 10 are connected in this manner, they are preferred by many
listeners because they have an appearance as well. In addition, since it can be handled as an
integral speaker cluster system 40, installation work in the acoustic space is easy. Below, the
connection method of speaker system 10 comrades is shown.
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[0054]
FIG. 4 is a view showing the appearance of the speaker system 10 and the connection means. The
connection means comprises a front connection and a rear connection. The plurality of speaker
systems 10 are connected by a front side connection fitting 51 that constitutes a front side
connection portion. Moreover, it is connected also by the back side connection reinforcement
metal fitting 52 which is a reinforcement member and the metal fitting 53 which comprise a rear
side connection part. The metal fitting 53 is a member for connecting the two rear connection
reinforcing metal fittings 52 to each other.
[0055]
The front connection fitting 51, the rear connection reinforcement fitting 52 and the fitting 53
are all plate-shaped and made of iron. In addition, it may be made of other materials instead of
iron. However, since the rear connection reinforcement bracket 52 is required to have strength, it
is desirable that the rear connection reinforcement fitting 52 be made of metal such as copper,
brass, or aluminum.
[0056]
In the front side connection fitting 51, two mounting holes 51a and one axial hole 51b are
formed. In the top plate portion 25 of the speaker system 10, four female screw holes 58 for
fixing the front connection fitting 51 are formed.
[0057]
Four mounting holes 52 a are formed in the rear connection reinforcement fitting 52. At the rear
of the speaker system 10, four female screw holes 59 for fixing the rear connection
reinforcement 52 are formed.
[0058]
In the metal fitting 53, four holes 53a are formed.
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[0059]
In order to connect the two speaker units 10, first, the front parts of the two speaker systems 10
are connected by the front connection fitting 51, and then the two speakers are connected by the
rear connection reinforcement fitting 52 and the fitting 53. The back of the system 10 may be
connected.
[0060]
FIG. 5 is a view showing in a step-by-step manner the procedure for connecting the fronts of the
two speaker systems 10 by the front side connection fitting 51. As shown in FIG.
First, as shown in (a), the front connection fitting 51 is fixed to the speaker system 10 by the bolt
61.
The bolt 61 is screwed into the female screw hole 58 of the speaker system 10 through the
mounting hole 51 a of the front connection fitting 51.
[0061]
Next, as shown in (b), the front side connection fittings 51 attached to the two speaker systems
10 are connected by a bolt 62 and a nut (not shown). The connection angle of the two speaker
systems 10 can be freely adjusted within a predetermined angle range in a state where the bolt
62 and the nut are screwed together and both are not strongly tightened.
[0062]
The front connection fitting 51 protrudes to the side of the front plate portion 21 of the speaker
system 10 to which it is attached. A bolt 62 passes through an axial hole 51b formed in the
protruding portion (projected portion) 51c (see FIG. 5A) (see FIG. 5B), and the bolt 62 is screwed
with the nut. The bolt 62 extends in the vertical direction. Thus, in the projecting portion 51 c of
the front connection fitting 51, a pivot support portion located in the vicinity of the end portion
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of the front plate portion 21 is formed. Since the bolt 62 extends in the vertical direction, it can
be said that the central axis of the pivot support also extends in the vertical direction. The
vertical direction in the present embodiment is a second direction orthogonal to the frontrear direction and the left-right direction .
[0063]
The reason for providing such a pivot support portion is to allow the connection angle of two
adjacent speaker systems 10 to be freely set in a predetermined angle range. With such a
configuration, the opening angle of the speaker cluster system 40 (see FIG. 3) can be set
arbitrarily within a predetermined angle range. Thereby, the directivity angle of the speaker
cluster system 40 can be arbitrarily set within a predetermined angle range.
[0064]
Further, in the projecting portion 51c in which the pivot support portion protrudes to the side of
the front plate portion 21 to which the woofer unit 30 and the tweeter units 31, 32 and 33 are
attached, the vicinity of the end portion in the left and right direction Because the connection
angles of the two speaker systems 10 are set at any angle, the end portions of the front plate 21
of the two speaker systems 10 are close to each other. Therefore, the woofer unit 30 and the
tweeter units 31, 32, and 33 of the two speaker systems 10 are not largely separated. When the
woofer units 30 and tweeter units 31, 32, and 33 of the two speaker systems 10 are largely
separated, it is not possible to obtain a smooth wavefront, and peaks and dips occur on the
directivity pattern.
[0065]
FIG. 6 is a view schematically showing a state in which two speaker systems 10 are connected by
the front connection fitting 51 or the like. In the speaker system 10 on the left side in the
drawing, the right end of the tweeter unit 31 disposed at the rightmost position is located near
the right end of the front plate portion 21. In the speaker system 10 on the right side in the
figure, the left end of the tweeter unit 33 disposed at the leftmost position is located near the left
end of the front plate portion 21. The bolt 62 which constitutes the pivot support portion is
located in the vicinity of the end portion of both front plate portions 21.
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[0066]
Because of this connection state, it is possible to obtain a smooth wavefront regardless of the
connection angle of the two speaker systems 10.
[0067]
Although not shown, the front portions of the bottom plates 26 of the two speaker units 10 are
also connected in the same manner as described above.
[0068]
FIG. 7 is a view showing a method of connecting the rears of the two speaker units 10 by the rear
connecting portion.
[0069]
FIG. 7 (a) shows two speaker systems 10 with the rear connection reinforcement 52 placed
thereon.
The rear connection reinforcing bracket 52 is placed on the speaker system 10 such that the
mounting holes 52 a thereof correspond to the female screw holes 59 of the speaker system 10.
As understood from FIG. 7A, the rear connection reinforcement fitting 52 is disposed in the
vicinity of the rear plate portion 22.
The width dimension of the rear connection reinforcement bracket 52 is approximately equal to
the width dimension of the rear plate portion 22 of the speaker system 10. Further, both ends in
the left-right direction of the rear side connection reinforcement fitting 52 are located in the
vicinity of both ends in the left-right direction of the rear plate portion 22.
[0070]
FIG. 7B is a view showing a state in which the rear of the two speaker systems 10 is connected by
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the fitting 53 and the bolt 64. As shown in FIG. The metal fitting 53 is disposed so as to overlap
the two rear connection reinforcing metal fittings 52. The bolt 64 passes through the hole 53a of
the bracket 53 and the mounting hole 52a of the rear connection reinforcing bracket 52, and is
screwed into the female screw hole 59 at the rear of the speaker system 10, and is tightened
there.
[0071]
In this manner, the front and rear portions of the two speaker systems 10 are connected by
various fittings, and then the bolt 62 shown in FIG. 6 is strongly tightened to a nut (not shown).
[0072]
The connection angle of the two speaker systems 10 can be changed variously by changing the
width (dimension in the left-right direction) of the metal fitting 53 shown in FIG. 7B.
[0073]
The rear side connection reinforcement fitting 52 is shown in FIGS. 7 (a) and 7 (b).
The rear side connection reinforcement fitting 52 is for giving strength to the plurality of
speaker systems 10 connected.
That is, when connecting not only two speakers but more speaker systems, a large force may be
applied to the rear of the speaker system 10. For example, the speaker cluster system 40 may be
suspended from the ceiling of a certain acoustic space. At this time, a wire from the ceiling may
be fixed to the fitting 53. Then, a large force is applied to the rear of the enclosure 20 of the
speaker system 10. The rear connection reinforcement fitting 52 is for preventing the force
applied at this time from acting directly on the enclosure 20.
[0074]
The rear connection reinforcement fitting 52 may be disposed outside the enclosure 20, but may
be disposed inside the enclosure 20 in advance. And you may form the attachment hole of a rear
side connection reinforcement bracket as a female screw hole.
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[0075]
FIG. 7C is a view showing a state in which the rear side connection reinforcement fittings 54
arranged in advance inside the enclosure 20 are connected via the fittings 53. Also in such a
structure, the rear connection reinforcement 54 provides strength to the plurality of connected
speaker systems.
[0076]
FIG. 8 is a front view of the speaker cluster system 40 shown in FIG. In this figure, the
dimensions of the speaker cluster system 40 are described.
[0077]
FIG. 9 is a plan view of the speaker cluster system 40 shown in FIG. Also in this figure, the
dimensions of the speaker cluster system 40 are described. In the speaker system 10 at both
ends of the plurality of speaker systems 10 arranged in parallel, the front connection fitting 51 is
provided only at one end in the left-right direction. In the other speaker systems 10, front
connection fittings 51 are provided at both ends in the left-right direction.
[0078]
As understood from this figure, a plurality of speaker systems 10 are radially arranged in parallel
along a circular arc. The position of the center point 40 a of this arc can be regarded as the
position of the virtual sound source of the speaker cluster system 40. That is, it is considered that
the speaker cluster system 40 can provide a substantially constant sound pressure in a
predetermined angular range from the virtual sound source located on the center point 40a.
[0079]
FIG. 10 is a partial cross-sectional view of the speaker cluster system 40 shown in FIGS. 8 and 9,
in which (a) shows the cross section including the tweeter units 31, 32, and 33, and (b) includes
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the woofer unit 30. The cross section is shown.
[0080]
FIG. 10A shows a tweeter unit row formed by twelve tweeter units 31, 32, and 33. FIG.
The center-to-center distances of adjacent two tweeter units in this tweeter unit row are all
approximately 40 mm. The center-to-center distance is preferably designed to be 60 mm or less.
[0081]
In this tweeter unit row, a plurality of tweeter units 31, 32 and 33 are closely arranged in
parallel, so peaks and dips on directivity patterns due to interference between sound waves from
the plurality of tweeter units 31, 32 and 33. Can be reduced.
[0082]
The woofer unit row formed by the woofer unit 30 of 4 is shown in FIG.
The center-to-center distances of two adjacent woofer units in this woofer unit row are all
approximately 135 mm. The center-to-center distance is preferably designed to be 140 mm or
less.
[0083]
In the woofer unit row, since the plurality of woofer units 30 are closely arranged in parallel, it is
possible to reduce peaks and dips on the directivity pattern due to the interference of the sound
waves from the plurality of woofer units 30.
[0084]
The applicant measured the directivity angle frequency characteristics in the horizontal plane
using a speaker cluster system having the same size and the same structure as the speaker
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21
cluster system 40 shown in FIG. 8 and FIG.
The directional angle is an opening angle in two directions in which the sound pressure level is 6
dB smaller than the sound pressure level of the reference axis.
[0085]
FIG. 11 shows this measurement result. Generally speaking, it is difficult to obtain a narrow
pointing angle at low frequencies with a small speaker device. Here, based on the directivity
angle of 60 degrees, attention is focused on how low the frequency can be maintained at the
directivity angle of 60 degrees. In the directivity angle frequency characteristic shown in FIG. 11,
a directivity angle of about 60 degrees is maintained up to 800 Hz.
[0086]
On the other hand, the applicant attached the driver unit to the constant directivity horn owned
by the applicant, and measured the directivity angle frequency characteristics in the horizontal
plane of the constant directivity horn.
[0087]
FIG. 12 is a diagram of the constant directivity horn 70, where (a) is a front view thereof, (b) is a
plan view thereof, and (c) is a side view thereof.
The dimensions of the constant directivity horn 70 are shown in FIG.
[0088]
FIG. 13 shows the measurement results of the constant directivity horn 70 of FIG. In the
directivity angle frequency characteristic shown in FIG. 13, a directivity angle of about 60
degrees is maintained only up to a frequency of 1.6 kHz.
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[0089]
As understood from FIGS. 8, 9, and 12, the speaker cluster system 40 is substantially the same as
the constant directivity horn 70 of FIG. 12 in height, width and depth dimensions. However, since
the constant directivity horn 70 is used with the driver unit attached, the depth dimension of the
speaker device using the constant directivity horn 70 becomes considerably larger than the
depth dimension described in FIG. 12.
[0090]
On the other hand, as understood from the comparison between FIG. 11 and FIG. 13, the speaker
cluster system 40 maintains the directivity angle of 60 degrees up to a lower frequency than the
constant directivity horn 70.
[0091]
From the above, although the speaker cluster system 40 and the conventional speaker apparatus
for the purpose of constant directivity (contant / directivity) are compared, although they are
substantially the same in height, width, and directivity angle, It is understood that the speaker
cluster system 40 can be designed to be smaller in size and smaller in size at each stage.
[0092]
Also, the constant directivity horn 70 can not alone amplify the voice at a sufficiently low
frequency.
Thus, the constant directivity horn 70 is often used in combination with the woofer system.
For this reason, the whole apparatus becomes larger. On the other hand, since the speaker
cluster system 40 includes the woofer unit 30, it is possible to amplify voice at a sufficiently low
frequency. Thus, it is not necessary to combine separate woofer systems. Also in this sense, it can
be said that the speaker cluster system 40 is more compact in each stage than the speaker device
using the constant directivity horn 70.
[0093]
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23
Furthermore, as understood from FIG. 11, with the speaker cluster system 40, directivity can be
sufficiently controlled even in a low frequency band to which a woofer is applied. The
effectiveness of the speaker cluster system 40 for directivity control at low frequencies is
apparent when comparing FIG. 11 with FIG.
[0094]
First, it has been described that the connection angle between the two speaker systems 10 can be
variously changed by changing the metal fitting 53 (see FIG. 8) to a metal fitting of different
dimensions.
[0095]
FIG. 14 is a plan view of a speaker cluster system 72 configured by connecting four speaker
systems 10 with a wider bracket 55.
The structure and dimensions of the speaker system 10 of the speaker cluster system 72 are the
same as those of the speaker system 10 shown in FIG. A point 72a indicates the position of the
virtual sound source of this speaker cluster system 72.
[0096]
The applicant measured the directivity angle frequency characteristics in the horizontal plane
using a speaker cluster system having the same size and structure as the speaker cluster system
72 shown in FIG.
[0097]
FIG. 15 shows the measurement results.
Here, based on the directivity angle of 35 degrees, attention is focused on how low the frequency
can be maintained at the directivity angle of 35 degrees. In the directivity angle frequency
characteristic shown in FIG. 15, a directivity angle of about 35 degrees is maintained up to a
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frequency of 1.4 kHz.
[0098]
The loudspeaker cluster system 72 of FIG. 14 has almost the same dimensions as the constant
directivity horn 70 of FIG. 12 and that the directivity angle of 60 degrees can be maintained only
up to 1.6 kHz in the constant directivity horn 70 of FIG. In view of the above, it can be
understood that the speaker cluster system 72 of FIG. 14 can obtain a narrower directivity angle
even at low frequencies.
[0099]
FIG. 16 is a plan view of a speaker cluster system 74 configured by preparing two sets identical
to the speaker cluster system 72 of FIG. 14 and connecting the two adjacent ones to the left and
right.
The speaker cluster system 74 has a width twice as large as that of the speaker cluster system 40
shown in FIGS. Further, the opening angle centered on the point 74a indicating the position of
the virtual sound source is approximately the same as that of the speaker cluster system 40 of
FIGS.
[0100]
Considering that the directivity angle of about 60 degrees is maintained up to 800 Hz in the
directivity angle frequency characteristics of the speaker cluster system 40 of FIGS. 8 and 9, the
directivity angle frequency characteristics of the speaker cluster system 74 of FIG. It can be
expected that a pointing angle of about 60 degrees is maintained up to about 400 Hz.
[0101]
FIG. 17 is a plan view of a speaker cluster system 76 configured by connecting the speaker
cluster system 40 of FIG. 8 and FIG. 9 and the speaker cluster system 72 of FIG.
In this speaker cluster system 76, it can be expected that a directivity angle of about 90 degrees
is maintained up to a frequency around 1 kHz.
04-05-2019
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[0102]
FIG. 18 is a plan view of the speaker cluster system 78. As shown in FIG. The speaker cluster
system 78 has the same opening angle as the speaker cluster system 40 shown in FIG.
[0103]
The plurality of speaker systems 10 constituting the speaker cluster system 78 are connected by
the front connection fitting 51 forming the front connection portion. The front connection fitting
51 is the same as the front connection fitting 51 used in the speaker cluster system 40 of FIG.
[0104]
The plurality of speaker systems 10 constituting the speaker cluster system 78 are also
connected by a connecting fitting 57 which is a connecting member. The connection fitting 57 is
made of iron.
[0105]
Each connection fitting 57 connects two adjacent speaker systems 10. The connecting fittings 57
adjacent to each other overlap in part. A bolt 64 passes through the overlapping portion. The bolt
64 is screwed into a female screw hole (not shown) formed in the top plate 25 of the speaker
system 10, and is tightened in this (female screw hole).
[0106]
The three connection fittings 57 provide a bridge between the speaker system 10 disposed at the
leftmost end and the speaker system 10 disposed at the rightmost end without interruption.
Thus, the bridge ¦ bridging means is comprised by connecting the three connection metal fittings
57. As shown in FIG.
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[0107]
In this way, the four speaker systems 10 are connected by the three connection fittings 57 and
are firmly integrated.
[0108]
When four speaker systems 10 shown in FIG. 1 were prepared and their side surfaces were
brought close to each other, a constant directivity of about 60 degrees could be obtained.
However, a wider angle constant directivity can not be obtained by combining the four speaker
systems 10 of FIG. This can be understood by referring to FIG. That is, since the rear portions of
the adjacent speaker systems 10 are close to each other, the four speaker systems 10 can not be
arranged to open wider than this.
[0109]
However, if the width of the rear plate portion 22 of the speaker system 10 is made narrower, a
speaker cluster system having a larger opening angle can be configured. For example, a speaker
cluster system can be configured such that a constant directivity of about 120 degrees can be
obtained by combining four speaker systems having a narrower rear plate portion. In this case, it
is desirable to arrange the tweeter units in the speaker system not along the straight line as
shown in FIG. 2, but along the convex arc. This is because it is desirable to form an arc-shaped
wavefront having a central angle of about 120 degrees by combining four loudspeaker systems,
and for that purpose, the wavefront of the sound wave emitted by one loudspeaker system has a
central angle of about 120 This is because it is desirable that the wave front has an arc shape of
30 degrees. Note that the projecting direction of the convex arc referred to here is the
forward direction in the speaker system.
[0110]
FIG. 19 is a cross-sectional view showing the arrangement of the three tweeter units 31, 32 and
33 in the speaker system 11, and is to be compared with FIG. Referring to FIG. 19, three tweeter
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units 31, 32, and 33 are arranged along a convex arc. Therefore, the wave front of the sound
wave emitted from the speaker system 11 also has an arc shape. The dashed-two dotted line 38
in the figure indicates the wave front.
[0111]
FIG. 20 is a plan view of the speaker system 10, which is similar to FIG. 1 (b). Here, the left side
plate portion 23 corresponds to one side plate portion in the first direction of the enclosure of
the speaker system 10, and the right side plate portion 24 corresponds to the other side plate
portion in the first direction of the enclosure of the speaker system 10.
[0112]
The angle (α) between the left side plate portion 23 and the right side plate portion 24 of the
speaker system 10 is approximately 15 degrees. Thus, making the angle (α) to be approximately
15 degrees is most suitable for configuring a speaker cluster system by a plurality of speaker
systems 10. The angle (α) does not have to be approximately 15 degrees, but is preferably 15
degrees or more.
[0113]
FIG. 21 is a cross-sectional view of the speaker system 10, and the front connection fitting 51 is
superimposed on the cross-sectional view.
[0114]
As understood from this figure, the distance in the front-rear direction between the central axis
of the bolt 62 serving as the pivot support portion and the front plate portion 21 is
approximately 14 mm.
[0115]
As described above, it is preferable that the central axis of the pivot support portion is located in
the vicinity of the front plate portion 21 in the longitudinal direction, but in the longitudinal
direction between the central axis of the pivot support portion and the front surface of the front
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plate portion 21 More preferably, the distance is 20 mm or less.
Further, the central axis of the pivot support may be located forward or backward of the front
surface of the front plate 21, but it is preferable to be located forward as shown in FIG.
[0116]
The top view of the speaker cluster system 40 was shown in FIG.
As understood from this plan view, the speaker cluster system 40 is configured by connecting a
plurality of speaker systems 10 by connection means. By being connected by the connection
means of FIG. 9, the angle between the adjacent speaker systems 10 is determined.
[0117]
However, it is also possible to use connection means that can change the angle between adjacent
speaker systems within a predetermined angle range.
[0118]
FIG. 22 is a plan view of the two speaker systems 10 connected by the first connection fitting
101 and the second connection fitting 102.
A connection means is constituted by the first connection fitting 101 and the second connection
fitting 102.
[0119]
The first connection fitting 101 is configured in the same manner as the front connection fitting
51 of FIG. 9. The bolt 62 functions as a pivot support. The second connection fitting 102 is a
plate-like member in which an arc-shaped slit 102 a is formed. The center of this arc coincides
with the central axis of the bolt 62. A bolt 65 is screwed into a female screw formed in the top
04-05-2019
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plate 25 of the speaker system 10 through the slit 102 a. Thereby, the angle between the two
speaker systems 10 within the predetermined angle range can be changed within the
predetermined angle range with the bolt 62 as the center.
[0120]
FIG. 22A shows the case where two bolts 65 are located at both ends of the slit 102a. In this
case, the angle between the two speaker systems 10 is the largest.
[0121]
FIG. 22 (b) shows a case where two bolts 65 are positioned in the middle of the slit 102 a. In this
case, the angle between the two speaker systems 10 is the smallest.
[0122]
By using such connection means, the opening angle of the speaker cluster system can be easily
changed within a predetermined angle range.
[0123]
Furthermore, it is also possible to use connection means that can change the angle between the
adjacent speaker systems within a predetermined angle range around the virtual pivot.
[0124]
FIG. 23 is a plan view of two speaker systems 10 connected by such connection means.
[0125]
The connection means shown in FIG. 23A is constituted by the third connection fitting 103 and
the fourth connection fitting 104.
[0126]
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The fourth connection fitting 104 is configured in the same manner as the second connection
fitting 102 of FIG.
The third connection fitting 103 is slightly shorter than the fourth connection fitting 104, but is
configured in substantially the same manner.
[0127]
An arc-shaped slit 103 a is formed in the third connection fitting 103.
A bolt 65 is screwed into a female screw formed in the top plate portion 25 of the speaker
system 10 through the slit 103a.
An arcuate slit 104 a is also formed in the fourth connection fitting 104.
A bolt 65 is screwed into a female screw formed in the top plate 25 of the speaker system 10
through the slit 104 a. Thereby, a virtual pivot P can be assumed in the vicinity of the front plate
portion between the two speaker systems 10. That is, when the angle between the two speaker
systems 10 is changed by slightly loosening the bolts 65 and sliding the bolts 65 in the slits
103a and 104a, it is as if it were centered on the virtual pivot P. The angle between the two
loudspeaker systems 10 is changed. As described above, the slits 103 a and the slits 104 a are
arc-shaped, but the centers of the arcs coincide with the virtual pivot axis P.
[0128]
The speaker system 10 can be in the state shown by the solid line in FIG. 23A, or can be in the
state shown by the alternate long and short dash line. In this manner, it is possible to change the
angle between two adjacent speaker systems 10 within a predetermined angle range around the
virtual pivot axis P.
[0129]
The connection means shown in FIG. 23 (b) is constituted by the fifth connection fitting 105.
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[0130]
The fifth connection fitting 105 has a structure in which the third connection fitting 103 and the
fourth connection fitting 104 in FIG. 23A are integrated.
That is, arcuate slits 103a and 104a are formed on the front and back. Also in the case of using
such connection means, a virtual pivot P can be assumed in the vicinity of the front plate portion
between the two speaker systems 10. Then, the angle between the two speaker systems 10
adjacent to each other within a predetermined angle range can be changed around the virtual
pivot axis P.
[0131]
It has been previously described with reference to FIG. 21 that the distance between the central
axis of the pivot support portion and the front surface of the front plate portion 21 in the frontrear direction is 20 mm or less. Further, it has been described that it is preferable that the central
axis of the pivot support portion be located forward of the front surface of the front plate portion
21.
[0132]
Similarly, in the case of using the connecting means as shown in FIGS. 23 (a) and 23 (b), it is
more preferable that the distance in the front-rear direction between the virtual pivot P and the
front surface of the front plate 21 be 20 mm or less. Further, it is desirable that the virtual pivot
P be positioned forward of the front surface of the front plate portion 21.
[0133]
Of course, the virtual pivot P as shown in FIGS. 23 (a) and 23 (b) may be assumed only on the
right end side in the left-right direction of the speaker system 10, or assumed on the left end side
only. However, it may be assumed on both ends.
04-05-2019
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[0134]
It has been described earlier that the speaker cluster system 40 of FIG. 9 can define the position
of the virtual sound source.
As a result, when the speaker cluster system 40 is attached closely to the wall of the acoustic
space, the problem of the mirror image sound source can be avoided. This is explained below.
[0135]
FIG. 24 is a view showing a state where a box-type speaker system 83 configured by attaching
the woofer unit 81 and the tweeter unit 82 to the cabinet 80 is closely attached to the wall
surface W. There are a plurality of acoustic wave paths from the tweeter unit 82 to the listener A.
One of them is a path (first path) 85 of the sound wave that reaches the listener A directly from
the tweeter unit 82 without any reflection. The other one is a sound wave path (second path) 86
which is reflected by the wall surface W and reaches the listener A. Since the speaker system 83
is in close contact with the wall surface W, the sound wave from the tweeter unit 82 is not
greatly attenuated even if it is reflected by the wall surface W. The sound wave propagating
along the second path 86 acts like the sound wave emitted from the mirror image source 87. The
difference between the path length of the first path 85 and the path length of the second path 86
results in the interference of sound waves. As a result, a large peak or dip occurs in the amplitude
frequency characteristic at the position of the listener A. This reduces the clarity of the sound
from the speaker system 83.
[0136]
FIG. 25 is a view showing a state in which a combined body 90 configured by combining a
constant directivity horn 88 and a cabinet 89 incorporating a woofer is closely attached to the
wall surface W. As shown in FIG. Also in this case, a mirror image sound source 91 is created,
and a plurality of sound wave paths from the constant directivity horn 88 to the listener A are
created. The sound wave reaching the listener A directly from the constant directivity horn 88
interferes with the sound wave reflected by the wall W and then reaching the listener A, so the
speech intelligibility is reduced.
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[0137]
FIG. 26 is a view showing a state in which the speaker cluster system 40 of FIG. 9 is closely
attached to the wall surface W. In this case, the position of the mirror image sound source
coincides with the position of the real sound source. This is because in the speaker cluster system
40, a virtual sound source is formed at the center point of an arc on which a plurality of speaker
systems are arranged, and this virtual sound source can be regarded as a real sound source, as
shown in FIG. This is because the virtual sound source of the speaker cluster system 40 is located
at a point 40 a on the wall W. Therefore, the clarity of the sound from the speaker cluster system
40 is not reduced by the reflection of the sound wave on the wall surface W.
[0138]
According to the present invention, a compact system can provide constant directivity over a
wider frequency range. Therefore, it is useful in the technical field of electroacoustics, especially
in the technical field of speaker systems.
[0139]
DESCRIPTION OF SYMBOLS 10 and 11 Speaker system 20 Enclosure 21 front plate part 22 back
plate part 23 left side plate part 24 right side plate part 25 top plate part 26 bottom plate part
27 opening part 30 woofer unit 31, 32, 33 tweeter unit 31a, 32a, 33a central axis 31b, 32b, 33b
Diaphragm 31c, 32c, 33c Equalizer 40, 72, 74, 76, 78 Speaker cluster system 51 Front
connection bracket 52, 54 Rear connection reinforcement bracket 53, 55 Bracket 57 Connection
bracket 61, 62, 64 bolt 70 constant directivity horn 83 speaker system 87 mirror image sound
source 90 combination body 91 mirror image sound source A listener W wall surface
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