JP2013012990A - Speaker apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a downsizable speaker apparatus with high directivity.SOLUTION: A first speaker unit 101 has a diaphragm oriented in a predetermined direction. A second speaker unit 102 has a diaphragm oriented in a predetermined direction, and is separated from the first speaker unit by a distance d of 0.17 m or more but less than 0.51 m in a direction orthogonal to the predetermined direction. A third speaker unit 103 has a diaphragm oriented in the opposite direction from a predetermined direction, and is separated from the first speaker unit by the distance d in the opposite direction from the predetermined direction. A fourth speaker unit 104 has a diaphragm oriented in the opposite direction from a predetermined direction, and is separated from the second speaker unit by the distance d in the opposite direction from the predetermined direction. A supply part supplies sound signals at an identical phase to the first and second speaker units, and supplies sound signals of opposite phase to the third and fourth speaker units.

Description

The present invention relates to a speaker device having directivity.

  In public facilities such as stations and large-scale stores, commercial facilities, and the like, PAs (Public Addresses, broadcasting facilities) that provide voice guidance broadcasting are widely used. In PA, since a guidance broadcast reaches outside the facility, noise is generated. Therefore, a directional speaker device is used so that the guidance broadcast reaches only the target area.

  As a speaker device having directivity, a dipole speaker device in which speaker units having the same performance are provided on opposite baffle surfaces of a cabinet and driven in an opposite phase is known (for example, see Patent Document 1).

  Further, as a speaker device having the same directivity, a tone Zoise type speaker in which a plurality of speakers are arranged in a straight line is known. (For example, refer to Patent Document 2).

JP-A-8-19089 Japanese Patent Laid-Open No. 2-239795

  In the speaker device described in Patent Document 1, the outputs of the two speaker units are in opposite phases in the left-right direction of the sound output direction. As a result, the sounds cancel each other, so that the directivity in the front-rear direction is generally increased. However, no special consideration is given to the distance between the two speaker units. Therefore, even in the front-rear direction, depending on the relationship between the distance between the two speaker units and the output wavelength, the outputs may cancel each other, resulting in a lower sound output level in the front-rear direction and a lower directivity as a whole. There was a problem that.

  Further, it is known that the tone Zoire speaker device described in Patent Document 2 has high directivity in the front-rear direction for a signal having a wavelength that is approximately twice the unit interval between the left and right units. However, the tone Zoire type speaker device needs to increase the number of speakers in order to increase directivity, and there is a problem that the size of the device increases because many speakers are arranged in a straight line.

  Accordingly, an object of the present invention is to provide a speaker device that has high directivity and can be miniaturized.

In order to solve the above problems, the present invention provides the following apparatus.
1) In a speaker device that amplifies an audio signal, the speaker device includes a first speaker unit (101) having a diaphragm directed in a predetermined direction and a speaker unit having a diaphragm directed in a predetermined direction. A second speaker unit (102) in which the distance between the center of the first speaker unit and the diaphragm in a direction orthogonal to the direction of the distance is 0.204 m or more and less than 0.51 m; A third speaker unit (103) that is directed in a direction opposite to the direction, wherein the distance between the center of the diaphragm and the first speaker unit is a distance d in a direction opposite to the predetermined direction; And a speaker unit in which the diaphragm is directed in a direction opposite to the predetermined direction, and the center of the diaphragm with the second speaker unit in the direction opposite to the predetermined direction The fourth speaker unit (104) having a distance d separated from each other and the audio signal is supplied to the first speaker unit and the second speaker unit in the same phase, and the third speaker unit and the fourth speaker. A speaker device comprising: a supply unit (21) for supplying an audio signal having a phase opposite to that of an audio signal output to the first speaker unit and the second speaker unit to the unit.
2) The speaker device according to 1), wherein the distance d is set to be 0.306 m or more and less than 0.442 m.
3) The speaker device according to 1) or 2), wherein the first speaker unit, the second speaker unit, the third speaker unit, and the fourth speaker unit are speaker units having the same characteristics.
4) A band dividing unit (51) that divides an input acoustic signal into a plurality of frequency bands, and at least one pair of speakers (4Bn) that outputs the acoustic signal divided by the band dividing unit, and a pair of speakers. Is the first speaker unit (4Bnfr) with the diaphragm directed in a predetermined direction and the wavelength of the acoustic signal at the center frequency of the frequency band output by a pair of speakers is λ, the diaphragm is directed in the predetermined direction. A second speaker unit that is spaced by a distance d of 0.3λ or more and less than 0.75λ in the center of the diaphragm with respect to the first speaker unit in a direction orthogonal to a predetermined direction (4Bnfl) and the speaker unit with the diaphragm facing in the direction opposite to the predetermined direction, the center of the diaphragm with the first speaker unit in the direction opposite to the predetermined direction A third speaker unit (4Bnrr) spaced apart by a distance d, and a speaker unit in which a diaphragm is directed in a direction opposite to a predetermined direction, the second speaker unit being in a direction opposite to the predetermined direction The fourth speaker unit (4Bnrl) having a distance d between the center of the diaphragm and the first speaker unit and the second speaker unit are supplied with acoustic signals divided by the band dividing unit in the same phase. And a supply unit (52n) for supplying the third speaker unit and the fourth speaker unit with an acoustic signal having a phase opposite to that of the acoustic signal output to the first speaker unit and the second speaker unit. A featured speaker device.
5) The speaker device according to 4), wherein the distance d is set to 0.45λ or more and less than 0.65λ.
6) The speaker device according to 4) or 5), wherein the first speaker unit, the second speaker unit, the third speaker unit, and the fourth speaker unit are speaker units having the same characteristics.

  According to the speaker device of the present invention, it is possible to provide a speaker device having high directivity and capable of being downsized.

It is a perspective view of 1st Example of the speaker apparatus of this invention. It is a block block diagram of 1st Example of the speaker apparatus of this invention. It is a figure which shows the directional characteristic of 1st Example of the speaker apparatus of this invention. It is a perspective view of 2nd Example of the speaker apparatus of this invention. It is a block block diagram of 2nd Example of the speaker apparatus of this invention.

Hereinafter, a speaker device of the present invention will be described based on an embodiment with reference to the accompanying drawings.
[First embodiment]
<Configuration>
FIG. 1 is a perspective view showing a speaker device 1 according to a first embodiment of the present invention. In FIG. 1, for ease of understanding, the housing and circuit portion of the speaker device 1 are not shown, and only the arrangement of the speaker units is shown. The speaker device 1 of the present embodiment is mainly used for the purpose of public announcements such as announcements in a PA, and amplifies and outputs a voice uttered by a human having a frequency band of 250 Hz to 600 Hz centering on a frequency of 500 Hz. To do.

  In FIG. 1, speaker units are arranged at vertices V1 to V4 of a square having one side d. Specifically, when A is the front direction of the speaker device 1, the front speaker unit 101 is arranged with the direction of the diaphragm as the front direction so that the center of the diaphragm comes to the position of the vertex V1 on the front side and the right side. . The front speaker unit 102 is arranged with the direction of the diaphragm in the forward direction so that the center of the diaphragm is positioned at the front and left vertex V2 at a distance d on the left side of the front speaker unit 101. Further, the rear speaker unit 103 is arranged with the direction of the diaphragm as the rear direction so that the center of the diaphragm comes to the position of the vertex V3 on the rear side and the right side separated by the distance d in the rear direction of the front speaker unit 101. Further, the rear speaker unit 104 is arranged with the direction of the diaphragm as the rear direction so that the center of the diaphragm comes to the position of the vertex V4 on the rear side and the left side that is separated by the distance d in the rear direction of the front speaker unit 102.

  The front speaker units 101 and 102 and the rear speaker units 103 and 104 are speaker units having substantially the same aperture and the same frequency characteristics, and are used in a state in which sound from the back is cut off by being attached to an enclosure. To do.

FIG. 2 is a block configuration diagram of the speaker device 1. As shown in FIG. 2, the input unit 20 sends the input audio signal to the supply unit 21. The supply unit 21 supplies the audio signal sent from the input unit 20 to the front speaker units 101 and 102, and inverts the phase of the audio signal supplied to the front speaker units 101 and 102 to the rear speaker units 103 and 104. Supply a sound signal.
<Action>
In the speaker device 1 of the present embodiment, FIG. 3 shows the directivity characteristics when the front and rear speaker units 101 and 102 and the rear speaker units 103 and 104 change the distance d between the front and rear and the left and right. FIG. 3 shows the sound pressure of the sound wave output in each direction of the speaker device 1 when the reference sound signal having the wavelength λ is input to the speaker device 1, using the speaker unit as a point sound source, and is shown in a pie chart. Is. In FIG. 3, the interval d is a multiple of λ. In the directional characteristic pie chart of FIG. 3, the downward direction is the front direction of the speaker device 1. In addition, twice the sound pressure of the output sound wave when the reference audio signal is input to one speaker unit is set to 0 dB (the maximum value of the scale of the pie chart).

  As shown in FIG. 3a), when d <0.3λ, the waveform of the directivity characteristic is a figure of 8 that spreads widely and the directivity of the speaker device 1 is low. Further, the sound pressure of the arrow A (forward direction) is about −6 dB, and the efficiency as the speaker device 1 is low.

  As shown in FIGS. 3b), c), and d), when 0.3λ ≦ d <0.45λ, the waveform of the directivity is a little wide but 8-shaped, and the speaker device 1 extends in the front-rear direction. Has directivity. Further, the maximum sound pressure exceeds -2 dB, and the efficiency as the speaker device 1 is high.

  As shown in FIGS. 3e), f), g), and h), when 0.45λ ≦ d <0.65λ, the waveform of the directivity has an 8-shaped shape, and the speaker device 1 is high in the front-rear direction. Has directivity. Further, the maximum sound pressure exceeds -2 dB, and the efficiency as the speaker device 1 is high.

  As shown in FIGS. 3i) and j), when 0.65λ ≦ d <0.75λ, the waveform of the directional characteristics shows a figure of 8 although some side lobes are generated. The directivity of the device 1 is high. The maximum sound pressure exceeds −4 dB, and the efficiency as the speaker device 1 is within an allowable range.

  As shown in FIGS. 3k) and l), when 0.75λ ≦ d, the waveform of the directivity characteristics shows a large side lobe, and the directivity of the speaker device 1 is low. Moreover, the maximum sound pressure is −6 dB or less, and the efficiency as the speaker device 1 is low and inferior in practicality.

  In summary, the speaker device 1 of this embodiment has low directivity when d <0.3λ. When 0.3λ ≦ d <0.75λ, there is directivity in the front-rear direction. Further, when 0.45λ ≦ d <0.65λ, it has high directivity in the front-rear direction and high efficiency. When 0.75λ ≦ d, directivity is low and efficiency is low.

  In addition, as described above, the speaker device 1 according to the present embodiment is mainly used for the purpose of sound amplification such as announcements in the PA, and outputs sound composed of sound wave signals in a frequency band centered on a frequency of 500 Hz. . If the speed of sound is 340 m / s, the wavelength of a sound wave having a frequency of 500 Hz is 0.68 m. At this time, 0.3λ ≦ d <0.75λ corresponds to 0.204 m ≦ d <0.51 m, and 0.45λ ≦ d <0.65λ corresponds to 0.306 m ≦ d <0.442 m.

  The speaker device 1 according to the present embodiment is characterized in that the distance d between the front and rear speaker units is 0.204 m ≦ d <0.51 m. More preferably, 0.306 m ≦ d <0.442 m.

  In the speaker device 1 of the present embodiment, the front speaker unit 101 and the rear speaker unit 103 constitute a dipole speaker. Similarly, the front speaker unit 102 and the rear speaker unit 104 constitute a dipole speaker. Some conventional dipole speaker devices are provided with a shielding plate in order to avoid interference of sound waves between speaker units in the front-rear direction. On the other hand, the speaker device of the present embodiment outputs audio signals having the same phase to two speaker units with the directions of the diaphragms being opposite to each other, and the interval between them is approximately 1 of the wavelength that is the center of the output. / 2. As a result, the phases of the outputs of the two speaker units are the same in the front-rear direction, and the outputs of each other are enhanced. Therefore, not only a shielding plate is unnecessary, but also directivity can be improved.

  Further, the front speaker units 101 and 102 constitute a tone Zoise type speaker. Similarly, the rear speaker units 103 and 104 constitute a tone Zoise type speaker. The tone Zoire speaker device has a high directivity in the front-rear direction for a signal having a wavelength that is approximately twice the interval between the left and right units, so that the directivity can be further increased.

  In addition, the speaker device 1 according to the present embodiment exhibits high directivity using four speaker units, and the two speaker units need only be arranged with a width of ½ wavelength in the horizontal direction. Compared to a speaker device, the size can be reduced.

It should be noted that the front / rear and left / right unit intervals of the speaker units are not necessarily the same, but may be within the above-described ranges.
[Second Embodiment]
<Configuration>
Next, the speaker device of the second embodiment will be described. The second embodiment is an example of a speaker device having high directivity over a wider frequency band than the first embodiment. The speaker device 4 of the second embodiment is provided with n sets (n is an integer of 2 or more) of speaker sets 4Bn with different intervals, with the speaker device 1 of the first embodiment as a set of speaker sets. It is a thing.

  Hereinafter, an example in which n = 6 will be described. FIG. 4 is a perspective view showing the arrangement of the speaker device 4 of the second embodiment of the speaker device of the present invention, in which FIG. 4a) is a perspective view showing the location of the speaker unit, and FIG. 4b) is the speaker unit arranged. It is a perspective view which shows a state. In order to facilitate understanding, in FIG. 4a), the speaker unit is not shown, and only the positional relationship of the place where the speaker unit is arranged is shown. In FIG. 4b), the positional relationship of the location where the speaker unit is arranged, the housing of the speaker device 4 and the circuit portion are not shown, and only the arrangement of the speaker unit is shown. In FIG. 4, C is the front direction of the speaker device 4.

  In this embodiment, the speaker unit is arranged so that the center of the diaphragm comes to the vertices Vn1 to Vn4 of a square having a side dn shown in FIG. 4A). Specifically, as shown in FIG. 4B), the front speaker unit 4Bnfr is arranged with the direction of the diaphragm in the forward direction so that the center of the diaphragm is located at the position of the right vertex Vn1 on the front side. The front speaker unit 4Bnfl is arranged with the direction of the diaphragm in the forward direction so that the center of the diaphragm is located at the position of the left vertex Vn2 on the front side separated by the distance dn on the left side of the front speaker unit 4Bnfr. Further, the rear speaker unit 4Bnrr is arranged with the direction of the diaphragm in the rearward direction so that the center of the diaphragm comes to the position of the right vertex Vn3 on the rear side separated by the distance dn in the rearward direction of the front speaker unit 4Bnfr. Further, the rear speaker unit 4Bnrl is arranged with the direction of the diaphragm in the rearward direction so that the center of the diaphragm comes to the position of the left vertex Vn4 on the rear side away from the front speaker unit 4Bnfl by the distance dn.

  The front speaker units 4Bnfr and 4Bnfl and the rear speaker units 4Bnrr and 4Bnrl are speaker units having the same characteristics with the same diameter and the same frequency characteristics, and are used in a state where the sound from the back is cut off by attaching to the enclosure. To do.

  FIG. 5 is a block configuration diagram of the speaker device 4. As shown in FIG. 5, the input unit 50 sends the input acoustic signal to the band dividing unit 51. The band dividing unit 51 includes n sets of BPFs (Band Pass Filters) 51n including capacitors and coils. The BPF 51n divides the frequency band of the input acoustic signal and outputs the band-divided acoustic signal to each speaker set 4Bn. Further, the front-rear and left-right distances dn between the front speaker unit and the rear speaker unit in each speaker set are set to approximately ½ of the wavelength of the center frequency of the acoustic signal divided for each speaker set by the band dividing unit 51.

  The speaker device 4 includes a first band speaker set 4B1, a second band speaker set 4B2, a third band speaker set 4B3, a fourth band speaker set 4B4, a fifth band speaker set 4B5, and a sixth band speaker. Six speaker sets 4Bn of the set 4B6 are provided.

  The input unit 50 sends the input acoustic signal to the band dividing unit 51. The dividing unit 51 includes six sets of BPFs 511 to 516, and divides the input acoustic signal into six frequency bands having different center frequencies by ½ octave.

  The BPF 511 outputs an acoustic signal in a frequency band with a center frequency of 500 Hz to the supply unit 521 of the first band speaker set 4B1. The supply unit 521 supplies the acoustic signals divided in band to the front speaker units 4B1fr and 4B1fl as they are, and supplies the acoustic signals divided in band to the rear speaker units 4B1rr and 4B1rl by inverting them. Further, the front-rear and left-right distances d1 between the front speaker units 4B1fr and 4B1fl and the rear speaker units 4B1rr and 4B1rl are set to 0.34 m, which is a half wavelength of an acoustic signal having a center frequency of 500 Hz.

  The BPF 512 outputs an acoustic signal in a frequency band centered on a frequency 707 Hz that is 1/2 octave higher than the center frequency 500 Hz of the BPF 511 to the supply unit 522 of the second band speaker set 4B2. The supply unit 522 supplies the acoustic signals divided into bands to the front speaker units 4B2fr and 4B2fl as they are, and supplies the rear speaker units 4B2rr and 4B2rl with the phase of the acoustic signals divided into bands reversed. In addition, the front-rear and left-right distances d2 between the front speaker units 4B2fr and 4B2fl and the rear speaker units 4B2rr and 4B2rl are set to 0.24 m, which is a half wavelength of an acoustic signal having a center frequency of 707 Hz.

  The BPF 513 outputs an acoustic signal in a frequency band centered at a frequency 1 kHz that is 1/2 octave higher than the center frequency 707 Hz of the BPF 512 to the supply unit 523 of the third band speaker set 4B3. The supply unit 523 supplies the acoustic signals divided into bands to the front speaker units 4B3fr and 4B3fl as they are, and supplies the acoustic signals divided into bands to the rear speaker units 4B3rr and 4B3rl by inverting them. In addition, the front-rear and left-right distances d3 between the front speaker units 4B3fr and 4B3fl and the rear speaker units 4B3rr and 4B3rl are set to 0.17 m which is a ½ wavelength of a 1 kHz acoustic signal.

  The BPF 514 outputs an acoustic signal in a frequency band centered at a frequency of 1.4 kHz that is 1/2 octave higher than the center frequency of 1 kHz of the BPF 513 to the supply unit 524 of the fourth band speaker set 4A4. The supplying unit 524 supplies the front-speaker units 4B4fr and 4B4fl with the band-divided acoustic signals as they are, and supplies the rear speaker units 4B4rr and 4B4rl with the phase of the band-divided acoustic signals inverted. In addition, the front-rear and left-right distances d4 between the front speaker units 4B4fr and 4B4fl and the rear speaker units 4B4rr and 4B4rl are set to 0.12 m which is a half wavelength of an acoustic signal having a center frequency of 1.4 kHz.

  The BPF 515 outputs an acoustic signal in a frequency band centered at a frequency 2 kHz that is 1/2 octave higher than the center frequency 1.4 kHz of the BPF 514 to the supply unit 525 of the fifth band speaker set 4B5. The supply unit 525 supplies the acoustic signals divided into bands to the front speaker units 4B5fr and 4B5fl as they are, and supplies the acoustic signals divided into bands to the rear speaker units 4B5rr and 4B5rl by inverting them. Also, the distance d5 between the front and rear and the left and right and left and right of the front speaker units 4B5fr and 4B5fl and the rear speaker units 4B5rr and 4B5rl is set to 0.085 m which is a half wavelength of the acoustic signal having the center frequency of 2 kHz.

  The BPF 516 outputs to the supply unit 526 of the sixth band speaker set 4B6 a sound signal in a frequency band centered on a frequency 2.82 kHz that is 1/2 octave higher than the center frequency 2 kHz of the BPF 515. The supplying unit 526 supplies the front-speaker units 4B6fr and 4B6fl with the band-divided acoustic signal as it is, and supplies the rear speaker units 4B6rr and 4B6rl with the phase of the band-divided acoustic signal inverted. Also, the distance d6 between the front speaker unit 4B6fr, 4B6fl and the rear speaker unit 4B6rr, 4B6rl is set to 0.06 m, which is a half wavelength of the acoustic signal having the center frequency of 2.82 kHz.

Even if the distance dn between the speaker units is not exactly λn / 2, it is effective if 0.3λn ≦ dn <0.75λn as in the first embodiment. More preferably, if 0.45λn ≦ dn <0.65λn, a greater effect is achieved. Furthermore, even if the distance between the front and rear and the distance between the left and right of each speaker unit are not necessarily the same, it is effective as long as each is within the above-mentioned range.
In addition, even if the divided sound signals of all frequency bands are not output by the speaker set as described above, the structure of outputting the sound signals of the frequency band for which high directivity is desired by the speaker set as described above is also effective. Play.

  In the n speaker sets 4Bn of the speaker device 4, the front speaker unit 4Bnfr and the rear speaker unit 4Bnrr constitute a dipole speaker. Similarly, the front speaker unit 4Bnfl and the rear speaker unit 4Bnrl constitute the same dipole speaker as in the first embodiment. That is, each speaker set cancels out the sound signal in the left-right direction and enhances the sound signal in the front-rear direction, and thus has high directivity.

  Further, in the n sets of speaker sets 4Bn, the front speaker unit 4Bnfr and the front speaker unit 4Bnfl constitute a tone Zoise type speaker. Similarly, the rear speaker unit 4Bnrr and the rear speaker unit 4Bnrl constitute a tone Zoise type speaker. The tone Zoire speaker device has a high directivity in the front-rear direction for a signal having a wavelength that is approximately twice the interval between the left and right units, so that the directivity can be further increased.

  In addition, the n speaker sets 4Bn of the speaker device 4 exhibit high directivity using four speaker units, respectively, and only two speaker units are arranged in a width of ½ wavelength in the horizontal direction. Therefore, the size can be reduced as compared with the conventional speaker device.

  In addition, each speaker set has a narrow frequency band, so it has a high directivity. Furthermore, since n speaker sets with different front and rear and left and right intervals are used for each appropriate frequency band, the speaker apparatus as a whole is a speaker apparatus having high directivity over a wide frequency band. Therefore, even when it is desired to output a sound source of a wider frequency band such as BGM (Back Ground Music), a sufficient directivity can be obtained.

1, 4 Speaker device 20, 50 Input unit 51, 51n Band division unit 21, 52n Supply unit 4Bn Speaker set 101, 102, 4Bnfr, 4Bnfl Front speaker unit 103, 104, 4Bnrr, 4Bnrl Rear speaker unit

Claims (6)

In a speaker device that amplifies an audio signal,
The speaker device is
A first speaker unit having a diaphragm directed in a predetermined direction;
A speaker unit having a diaphragm directed in the predetermined direction, wherein a distance d between the center of the first speaker unit and the diaphragm is 0.204 m or more and less than 0.51 m in a direction orthogonal to the predetermined direction. A second speaker unit separated by
A speaker unit having a diaphragm directed in a direction opposite to the predetermined direction, wherein a distance between the center of the diaphragm and the first speaker unit is separated by the distance d in a direction opposite to the predetermined direction. A third speaker unit,
A speaker unit having a diaphragm directed in a direction opposite to the predetermined direction, wherein the distance between the center of the diaphragm and the second speaker unit is separated by the distance d in a direction opposite to the predetermined direction. A fourth speaker unit,
An audio signal is supplied to the first speaker unit and the second speaker unit in the same phase, and the first speaker unit and the second speaker are supplied to the third speaker unit and the fourth speaker unit. A speaker device comprising: a supply unit that supplies an audio signal having a phase opposite to the phase of the audio signal output to the unit. The speaker device according to claim 1, wherein the distance d is set to be 0.306 m or more and less than 0.442 m. The speaker according to claim 1 or 2, wherein the first speaker unit, the second speaker unit, the third speaker unit, and the fourth speaker unit are speaker units having the same characteristics. apparatus. A band dividing unit that divides the input acoustic signal into a plurality of frequency bands;
And at least one set of speakers that output the acoustic signal divided by the band dividing unit,
The set of speakers includes a first speaker unit having a diaphragm directed in a predetermined direction;
When the wavelength of the acoustic signal of the center frequency of the frequency band output by the set of speakers is λ, the speaker unit has a diaphragm directed in the predetermined direction, and the direction is perpendicular to the predetermined direction. A second speaker unit in which the distance between the center of the diaphragm and the first speaker unit is separated by a distance d of 0.3λ or more and less than 0.75λ;
A speaker unit having a diaphragm directed in a direction opposite to the predetermined direction, wherein a distance between the center of the diaphragm and the first speaker unit is separated by the distance d in a direction opposite to the predetermined direction. A third speaker unit,
A speaker unit having a diaphragm directed in a direction opposite to the predetermined direction, wherein the distance between the center of the diaphragm and the second speaker unit is separated by the distance d in a direction opposite to the predetermined direction. A fourth speaker unit,
The first speaker unit and the second speaker unit are supplied with the sound signal divided by the band dividing unit in the same phase, and the first speaker is supplied to the third speaker unit and the fourth speaker unit. A speaker device comprising: a unit and a supply unit that supplies an acoustic signal having a phase opposite to the phase of the acoustic signal output to the second speaker unit. The speaker device according to claim 4, wherein the distance d is set to 0.45λ or more and less than 0.65λ. 6. The speaker device according to claim 4, wherein the first speaker unit, the second speaker unit, the third speaker unit, and the fourth speaker unit are speaker units having the same characteristics. .

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