JP3943113B2 - Speaker box - Google Patents

Description

  The present invention relates to a speaker box, and more particularly to a speaker box that employs a multi-speaker configuration and can emit sound over a wide viewing range.

  As a speaker box, a speaker box is generally formed in a polygonal shape such as a quadrangle or a pentagon, and a required number of speakers are incorporated therein (see, for example, Patent Documents 1 to 4).

  Among these, for example, speaker boxes shown in FIGS. 11 to 13 are known as speaker boxes in which a plurality of speakers are accommodated to expand the viewing area. That is, FIG. 11 shows that two speakers 4A and 4B are housed in a speaker box 1 having a square cross section by rotating the acoustic axes 6A and 6B by 90 ° in the horizontal direction. It is attached to the baffle plates 5a and 5b (crossing angle 90 °). FIG. 12 shows that two speakers 4A and 4B are housed in a speaker box 2 having a regular pentagonal cross section by rotating the acoustic shafts 6A and 6B by 72 ° horizontally and adjoining two baffle plates 5a and 5b. (Cross angle 105 °). FIG. 13 shows two speaker 4A, 4B in the same hexagonal speaker box 3 and two baffle plates 5a adjacent to each other in the speaker box 3 by rotating the acoustic axes 6A, 6B by 60 ° in the horizontal direction. It is attached to 5b (crossing angle 120 °). As the speakers 4A and 4B, speakers having horizontal directivity of 60 ° are used.

JP-A-11-225389 JP 2000-077862 A JP 2000-125381 A JP-A-11-98588

  However, in the conventional speaker boxes 1 to 3 described above, since the sounds radiated from the speakers 4A and 4B do not overlap, a sound valley (sound) between the sound fields (sound radiation areas) of the speakers 4A and 4B. There is a problem that a viewing area with a weak pressure level) is created and the viewing position is limited. That is, in the case of the speaker box 1 shown in FIG. 11, since the acoustic axes 6A and 6B of the sounds radiated from the speakers 4A and 4B intersect at an angle of 90 °, the two sound radiation areas 7A and 7B are formed. A viewing area (shaded area) 8A having a weak sound pressure level is generated between them without overlapping.

  Similarly, in the speaker boxes 2 and 3 shown in FIGS. 12 and 13, viewing areas (shaded portions) 8B and 8C having a low sound pressure level are generated.

  The present invention has been made to solve the above-described conventional problems, and the object of the present invention is to expand the viewing area without generating a viewing area with a relatively simple structure and a low sound pressure level. An object of the present invention is to provide a speaker box that can be used.

In order to achieve the above object, a first invention is a polygonal speaker box main body that is open on the upper side and closed on the lower side and houses a plurality of speakers, and a lid that covers the upper opening of the speaker box main body. A speaker mounting plate having a half shape of a truncated octagonal pyramid formed by a series of four trapezoidal plates to which the speaker is mounted, and a back portion of the speaker mounting plate. A two-dimensionally symmetrical internal space is formed by a trapezoidal back plate that covers the bottom plate, a bottom plate that covers the lower opening of the back plate and the speaker mounting plate, and the bottom plate, the speaker mounting plate, and the back plate. One of integrally formed by a partition plate for partitioning the space, the lid, the and a bottom plate similar to the shape formed to a larger regular octagonal halved, the partition plate, the cross-section Jo with the width becomes gradually narrower toward the free speaker mounting plate from the rear plate, in which are formed become gradually narrower toward the distal end than the proximal end.

Further, according to a second aspect , in the first aspect, the left and right side surfaces of the partition plate are formed as convex curved surfaces .

The third invention comprises two speaker boxes according to the first or second invention, and these speaker boxes are joined back to back to form a truncated octagonal pyramid.

The fourth invention comprises a polygonal speaker box main body that is open on the upper side and closed on the lower side and houses a plurality of speakers therein, and a lid that covers the upper opening of the speaker box main body, The speaker box body includes a speaker mounting plate having a truncated octagonal pyramid formed by a series of eight trapezoidal plates to which a speaker is mounted, and a regular octagonal bottom plate covering a lower opening of the speaker mounting plate And a partition plate that divides an internal space formed by the bottom plate and the speaker mounting plate into four spaces, and the lid body is formed in a regular octagon that is similar to and larger than the bottom plate. is, the partition plate is composed of four plate portions by forming the plan view cross-shaped, these plate portions are in the speaker mounting plate than the cross-sectional shape is the center of the bottom plate With width becomes gradually narrower as buy, but are formed so as to become gradually narrower toward the distal end than the proximal end.

Moreover, 5th invention forms the left-and-right both sides | surfaces of the said partition plate in the 4th invention in the convex curve .

Further, the sixth invention comprises a plurality of speaker boxes of the fourth or fifth invention, and these speaker boxes are connected in series in the vertical direction by a connecting member.

  In the first invention, there is provided a speaker mounting plate having a half shape of a truncated octagonal pyramid formed by a series of four trapezoidal plates, and each trapezoidal plate has a horizontal directivity characteristic of sound. For example, when a 60 ° speaker is attached, the sound emission areas of adjacent speakers overlap each other, and a viewing area with a low sound pressure level does not occur. A 1/2 sound field can be created.

In the first aspect of the invention, the interior of the speaker box body is partitioned into two spaces by the partition plate, so that interference of sounds between the speakers is suppressed. In addition, the cross-sectional shape of the partition plate is formed so that the width gradually decreases from the back plate toward the speaker mounting plate, and the width gradually decreases from the base end toward the distal end. No natural vibration is generated and the influence on the speaker box is suppressed. Et al is, as the cross-sectional shape of the partition plate, when shaped to bend the both sides in a convex shape as in the second invention, it is possible to further suppress the natural vibration.

  In the third and fourth inventions, the speaker box is a truncated octagonal pyramid and the speaker mounting plate is composed of eight trapezoidal plates, and each trapezoidal plate has a horizontal directional characteristic of sound, for example. When a 60 ° speaker is attached, the sound emission areas of adjacent speakers do not overlap each other and a viewing area with a low sound pressure level does not occur. Therefore, when the speaker box is mounted on the ceiling, a hemispherical sound field having the speaker box as a sphere can be created.

In the fourth aspect of the invention, since the interior of the speaker box body is partitioned into four spaces by the partition plate, the sound interference between the speakers is suppressed. Moreover, if the interior of the speaker box body is divided into four spaces, the parallel planes inside can be reduced, so that standing waves are difficult to stand up when driving the speakers, and therefore the deterioration of frequency characteristics due to standing waves is prevented, It can be close to the original characteristics of the speaker.
In addition, the partition plate is formed by four plate portions by forming a cross shape in plan view, and the cross-sectional shape of these plate portions gradually narrows from the center of the bottom plate toward the speaker mounting plate, Since the width gradually decreases from the base end toward the front end, natural vibration does not occur when the speaker is driven, and the influence on the speaker box is suppressed. Furthermore, as the cross-sectional shape of the partition plate, the natural vibration can be further suppressed by forming the both side surfaces into a convex shape as in the fifth invention .

In the sixth invention , since a plurality of speaker boxes according to the fourth or fifth invention are provided, a loud sound can be emitted, which is suitable for outdoor performance halls, dome stadiums, and the like. .

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is a plan view of a speaker box according to an embodiment of the present invention with a cover removed, FIG. 2 is a rear view of the speaker box main body and the cover, and FIG. 3 is a partially broken view of the speaker box. It is a disassembled perspective view. This embodiment shows an example in which the speaker box 20 is attached to the wall surface 11. Also, FIG. 3 shows an example in which two speaker boxes 20 are used individually, and a case in which the two speaker boxes 20 are combined back to back and used on the ceiling.

  In these drawings, a speaker box generally indicated by reference numeral 20 is composed of a speaker box main body 21 and a lid 22 that closes the upper opening 23 of the speaker box main body 21, and two bolts 24 are provided on the wall surface 11. And is fixed by a nut 25.

  The speaker box body 21 is integrally formed by die-casting with an aluminum alloy or the like, so that the top side of the regular octagonal pyramid is cut as well as along a plane including any two opposite corners and the central axis. The shape is divided into two equal parts (hereinafter referred to as a half-shape of a truncated octagonal pyramid), the upper side is open and the lower side is closed, and four speakers 4 are housed inside. In this case, the speaker box main body 21 has a half shape with a regular octagon on the upper side and the lower side, but strictly speaking, since the upper side contour shape is larger than the lower side contour shape, it is strictly an inverted truncated octagonal pyramid. It has a halved shape. However, since the speaker box 20 may be used upside down depending on the usage form, the present invention does not strictly distinguish between the truncated octagonal pyramid and the inverted truncated octagonal pyramid. A truncated octagonal pyramid is sometimes used as a broad term that includes the octagonal pyramid.

  The upper opening 23 of the speaker box body 21 has a regular octagonal halved shape. The regular octagonal halved shape refers to a shape obtained by cutting the regular octagon along a diagonal line connecting two arbitrary corners facing each other.

  Further, the structure of the speaker box main body 21 will be described in detail. The speaker box main body 21 includes a series of four trapezoidal (inverted trapezoidal) plates (baffle plates) 26a to 26d to which the speakers 4 are respectively attached. A speaker mounting plate 26 having a half shape of a truncated octagonal pyramid, a trapezoidal (reverse trapezoidal) back plate 27 covering the back of the speaker mounting plate 26, the back plate 27 and the speaker mounting plate 26 And a partition plate 30 that partitions an internal space 29 formed by the bottom plate 28, the speaker mounting plate 26, and the back plate 27. A concave portion 31 into which the lid body 22 is fitted is formed on the inner peripheral side on the upper side of the speaker box main body 21. The recess 31 has a regular octagonal halved shape that is slightly larger than the upper opening 23 of the speaker box body 21.

  Sound emitting holes 33 are respectively formed in the centers of the plates 26 a to 26 d of the speaker mounting plate 26, and the speakers 4 are respectively connected to the sound emitting holes 33 from the outside (or inside) of the speaker box body 21. It is attached and the surface side is covered with a net 34. Since the speaker mounting plate 26 has a half shape of a truncated octagonal pyramid, the crossing angles α between the plates 26a and 26d on both sides of the four plates 26a to 26d and the back plate 27 are 70 °, which are adjacent to each other. The crossing angle β between the two plates 26a and 26b, 26b and 26c, and 26c and 26d is 135 °, respectively. Moreover, the inclination | tilt angle (theta) of the perpendicular direction of each board 26a-26d is 30 degrees.

  As the speaker 4, a horizontal range type speaker having both 60 ° horizontal and vertical directivity is used. Each speaker 4 is incorporated in the speaker box main body 21, and the acoustic axes 16A to 16D are perpendicular to the plates 26a to 26d, and the intersecting angle γ with the vertical plane is 60 °.

  A semi-cylindrical boss portion 36 and a pair of left and right bolt mounting portions 37 are integrally projected on the inner surface of the back plate 27. The boss portion 36 is located at the center of the back plate 27 and is formed so as to protrude toward the inside of the speaker box main body 21. The boss portion 36 is used as an attachment portion for the bolt 39 (FIG. 3) when the two speaker boxes 20 and 20 are joined back to back and attached to the ceiling. Each of the pair of bolt mounting portions 37 has a T-shaped groove 38 that opens to the front surface and the upper surface of the back plate 27, and when the back plate 27 is fixed to the wall surface 11, Inserted so that the height can be adjusted.

  The partition plate 30 connects the center of the bottom plate 28, the boss portion 36, and a joint portion between the two adjacent plates 26 b and 26 c so that the internal space 29 of the speaker box main body 21 is symmetric 2. It is partitioned into two spaces 29a and 29b. As a cross-sectional shape of the partition plate 30, the width is gradually narrowed from the boss portion 36 toward the speaker mounting plate 26. Further, the width is gradually reduced from the base end of the partition plate 30, that is, from the bottom plate 28 side end toward the tip (upper opening 23 of the speaker box body 21). Thus, if the cross-sectional shape of the partition plate 30 is tapered, the natural vibration of the partition plate 30 can be suppressed, and the influence on the speaker box 20 can be reduced. In this case, the left and right side surfaces of the partition plate 30 are formed as flat surfaces. However, when the partition plate 30 is formed as a convex curved surface, the natural vibration of the partition plate 30 can be further suppressed.

  Further, a connecting wire groove 41 for guiding the connecting wire 40 of the speaker 4 to both the spaces 29a and 29b and a set screw 42 for fixing the lid 22 are screwed into appropriate positions on the front end surface of the partition plate 30. A screw hole 43 is formed. Note that one end of the connection line 40 is connected to a terminal of each speaker 4, and the other end is connected to an input terminal (not shown) provided at an appropriate location of the speaker box body 21.

  The lid body 22 is formed of an aluminum alloy or the like in a half shape of a regular octagon that is similar to and larger than the bottom plate 28. Such a lid body 22 is fitted into a recess 31 formed on the upper surface of the speaker box main body 21 and is fixed by a plurality of set screws 42, thereby making the upper opening 23 of the speaker box main body 21 confidential. It is sealed. Thus, the speaker box 20 constitutes a ductless hermetic enclosure.

  When each speaker 4 is driven in such a speaker box 20, the sound emitted from these speakers is radiated obliquely downward with an angle of directivity of 60 °. In addition, among the sounds radiated from the two speakers 4 located on the left and right sides, particularly the sounds BL and AL on the wall surface side travel substantially parallel to the wall surface 11. Therefore, the acoustic influence by the wall surface 11 is small.

Here, in the present embodiment, the speaker box main body 21 is formed in a half shape of a truncated octagonal pyramid, and the speaker 4 is mounted on each of the plates 26a to 26d of the speaker mounting plate 26. The crossing angles of the acoustic axes 16A and 16B, 16B and 16C, and 16C and 16D of the two speakers 4 can be 45 °, respectively. As a result, the sound radiation areas R ₁ and R ₂ , R ₂ and R ₃ , R ₃ and R ₄ of adjacent speakers 4 intersect at points P _{1 to} P ₃ and overlap each other. The intersection points P _{1 to} P ₃ are approximately 440 mm from the center of the speaker box 20 when the distance from the center of the speaker box 20 (center of the boss portion 36) to the side is 230 mm. When the two sound radiation areas overlap each other in this way, the sound pressure level is slightly amplified acoustically in the areas (superimposed areas) X ₁ , X ₂ , and X ₃ . For example, if the sound pressure levels of the sound radiation areas R ₁ and R ₂ are 100 dB, the sound pressure in the superposition area X ₁ after the intersection P ₁ where these sound radiation areas overlap (same for X ₂ and X ₃ ). The level is amplified to 103 dB. Therefore, a sound field with a low sound pressure level does not occur, and the viewing area can be expanded. When the speaker box 20 is attached to the wall surface 11, a sound field approximately half of a hemispherical circle is formed below the speaker box 20. Can be produced.

  In addition, when the back plates 27 of the two speaker boxes 20 and 20 shown in FIG. 3 are in close contact with each other and integrally joined to form a reverse truncated octagonal pyramid speaker box, and this speaker box is mounted on the ceiling, Since a total of eight speakers 4 are respectively attached to the plates 26a to 26d of the speaker mounting plates 26 and 26 forming a reverse truncated octagonal pyramid, a hemispherical sound having a substantially uniform sound pressure level below the speaker box A place can be created. In order to connect the two speaker boxes 20, 20, the back plates 27 of the two speaker box bodies 21, 21 are brought into close contact with each other, and an H-shaped groove 38 is formed in the T-shaped groove 38 of the two bolt mounting portions 37 facing each other. The connecting metal fitting 44 may be inserted.

  4 is a cross-sectional view of a speaker box according to another embodiment of the present invention attached to the ceiling, FIG. 5 is an exploded perspective view showing a part of the speaker box, and FIG. FIG. 7 is a bottom view of the speaker box. Note that the same parts and portions as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In these drawings, the speaker box 50 shown in the present embodiment is composed of a speaker box main body 51 and a lid body 53 that secretly closes the upper opening 52 of the speaker box main body 51, and the ceiling plate 54 has bolts. 39 is attached.

  The speaker box main body 51 is formed by integrally molding two speaker box main bodies 21 and 21 having the half-structure of the truncated octagonal pyramid shown in FIG. 3, and includes eight trapezoidal (reverse trapezoidal) plates ( Baffle plate) 56a to 56h formed in series, a speaker mounting plate 56 having a truncated (reverse wharf) octagonal pyramid, a regular octagonal bottom plate 57 covering the lower opening of the speaker mounting plate 56, and A partition plate 61 divides an internal space 60 formed by the bottom plate 57 and the speaker mounting plate 56 into four spaces 60a to 60d. The speaker box main body 51 does not include the bolt mounting portion 37 shown in FIG.

  Sound emitting holes 33 are respectively formed in the centers of the respective plates 56 a to 56 h of the speaker mounting plate 56, and the speakers 4 are respectively connected to the sound emitting holes 33 from the outside (or inside) of the speaker box main body 51. It is attached and the surface side is covered with a net 34. Since the speaker mounting plate 56 has an inverted truncated octagonal pyramid, the crossing angle β between the two adjacent plates 56a and 56b, 56b and 56c,... 56g and 56h is 135 °. In addition, the inclination angle θ with respect to the vertical plane of each of the plates 56a to 26h is 30 °. A regular octagonal recess 63 into which the lid 53 is fitted is formed on the upper surface of the speaker mounting plate 56.

  On the upper surface (inner surface) of the bottom plate 57, the partition plate 61 and a cylindrical boss 65 are integrally projected. The partition plate 61 is composed of four vertical plate portions 61 to 61d that are orthogonal to each other when formed in a cross shape in plan view, and the boss portion 65 is provided at the center thereof. In other words, the partition plate 61 is configured by the boss portion 65 and the four plate portions 61a to 61d that are equally distributed in the circumferential direction around the boss portion 65 and extend radially. Of the four plate portions, the plate portion 61a connects the joint portion between the two plates 56a and 56b and the boss portion 65, and the plate portion 61b connects the joint portion between the two plates 56c and 56d and the boss portion 65. The plate portion 61c connects the joint portion between the two plates 56e and 56f and the boss portion 65, and the plate portion 61d connects the joint portion between the two plates 56g and 56h and the boss portion 65.

  The cross-sectional shapes of the plate portions 61a to 61d are formed such that the width gradually decreases from the boss portion 65 toward the speaker mounting plate 56. Moreover, it forms so that a width | variety may become narrow gradually as it goes to the front-end | tip (upper side opening part 52 of the speaker box main body 51) from the base end of each plate part 61a-61d, ie, the bottom plate 57 side end. Thus, if the cross-sectional shape of each plate part 61a-61d is made into a taper taper shape, the natural vibration of the partition plate 61 can be suppressed and the influence on the speaker box 50 can be reduced. Further, if the left and right side surfaces of each of the plate portions 61a to 61d are formed into curved surfaces that are convexly curved as shown in FIG. 6, the natural vibration of the partition plate 61 can be further suppressed. And the connection line groove part 41 for guiding the connection line of the speaker 4 to the adjacent spaces 60a to 60d and the set screw for fixing the lid 53 are provided at appropriate positions on the front end surfaces of the plate parts 61a to 61d. A screw hole 43 into which 42 is screwed is formed.

  The boss 65 is integrally protruded from the center of the upper surface of the bottom plate 57 and opened up and down, and the bolt 39 is inserted and screwed into the ceiling plate 54 when the speaker box 50 is attached to the ceiling plate 54.

  The lid 53 is formed in a regular octagon of aluminum alloy or the like in the same manner as the speaker box main body 51, is fitted into the concave portion 63 from above, and is fixed by a plurality of set screws 42. The upper opening 52 is airtightly closed. Thus, the speaker box 50 constitutes a ductless hermetic enclosure. A bolt hole 66 through which the bolt 39 passes is formed in the center of the lid 53.

  According to the speaker box 50 having such a structure, a speaker having a reverse truncated octagonal pyramid by connecting the two speaker box main bodies 21 having the halved structure of the inverted truncated octagonal pyramid shown in FIG. 3 back to back. Similar to the box, a sound radiation area having a low sound pressure level does not occur, and a hemispherical sound field having a substantially uniform sound pressure level can be created below the ceiling board 54.

  Further, since the internal space 60 of the speaker box main body 51 is partitioned into four spaces 60a to 60d by a cross-shaped partition plate 61 in plan view, it is possible to suppress the interference of sounds between the speakers 4 and the speaker box main body 51. Since there are no parallel planes facing each other in the interior, standing waves are less likely to stand when the speaker 4 is driven, and therefore, the standing waves do not cause resonance and the acoustic characteristics of the speaker box 50 are improved. Can enjoy the sound.

  Further, the cross-sectional shapes of the four plate portions 61a to 61d constituting the partition plate 61 are formed so that the width gradually decreases from the boss portion 65 toward the speaker mounting plate 56, and each of the plate portions 61a to 61d. Since the width is gradually narrowed from the base end toward the front end, the partition plate 61 does not cause natural vibration when the speaker 4 is driven, and the influence on the speaker box 50 can be minimized.

FIG. 8 is an external perspective view showing another embodiment of the present invention.
In this embodiment, a speaker box 50 shown in FIGS. 4 to 7 is alternately turned upside down, and six of them are overlapped and connected in series by a connecting member 70 to constitute a multi-type speaker box 80. It is. A rod or the like is used as the connecting member 70, and all speaker boxes 50 are connected by passing through the boss portions 65 (see FIG. 6) of each speaker box 50.

  According to such a speaker box 80, since a loud sound can be radiated in a spherical shape, it is suitable for use in a large outdoor circular venue or the like.

FIG. 9 is an external perspective view showing another embodiment of the present invention.
In this embodiment, two speaker boxes 50 and 50 are overlapped so that the bottom plates are in close contact with each other and are integrally connected by a connecting member 80 to form a speaker unit 90, and a plurality of speaker units 90 are suspended. Thus, one speaker box 92 is configured as a whole. The connecting member 80 of each speaker unit 90 passes through the boss portions 65 of the two speaker boxes 50 and is connected by a hook 91.

  According to the speaker box 92 having such a structure, it is possible to radiate a loud sound like a speaker box 80 shown in FIG. 8 in a spherical shape. For example, the speaker box 92 is suspended from a ceiling of a dome-shaped stadium. It is preferable.

FIG. 10 is an external perspective view showing still another embodiment of the present invention.
In this embodiment, five speaker boxes 50 shown in FIG. 4 to FIG. 7 are overlapped in the vertical direction and connected in series by a connecting member 100 to constitute a multi-type speaker box 101. is there.

  In such a speaker box 101 as well, it is possible to radiate a loud sound and create a hemispherical sound field. Therefore, it is preferable to suspend the speaker box 101 from the ceiling of a dome-shaped ball field.

  Although the present invention has been described with respect to an example in which the present invention is applied to the ductless speaker boxes 20 and 50, the present invention is not limited to this and is also applied to a bass reflex type (phase inversion type) speaker box in order to extend the low frequency range of reproduced sound. can do.

It is the top view which removed the cover of one embodiment of the speaker box concerning the present invention. It is a rear view of a speaker box main body and a lid. It is a disassembled perspective view which fractures | ruptures and shows a part of the speaker box. It is sectional drawing of the state which attached the speaker box which shows other embodiment of this invention to the ceiling. It is a disassembled perspective view which fractures | ruptures and shows a part of the speaker box. It is a top view of a speaker box main body. It is a bottom view of the speaker box. It is an external appearance perspective view which shows other embodiment of this invention. It is an external appearance perspective view which shows other embodiment of this invention. It is an external appearance perspective view which shows other embodiment of this invention. It is a figure which shows the conventional speaker apparatus, and is a figure for demonstrating the radiation | emission area | region of a sound when two speakers are accommodated in a regular square speaker box. It is a figure which shows the conventional speaker apparatus, and is a figure for demonstrating the radiation | emission area | region of a sound when two speakers are accommodated in a regular pentagon speaker box. It is a figure which shows the conventional speaker apparatus, and is a figure for demonstrating the radiation | emission area | region of a sound when two speakers are accommodated in a regular hexagonal speaker box.

Explanation of symbols

4 ... Speaker, 20 ... Speaker box, 21 ... Speaker box main body, 22 ... Cover, 23 ... Upper opening, 26 ... Speaker mounting plate, 26a-26d ... Plate, 27 ... Back plate, 28 ... Bottom plate, 29 ... Inside Space, 30 ... Partition plate, 50 ... Speaker box, 51 ... Speaker box body, 52 ... Upper opening, 53 ... Cover, 56 ... Speaker mounting plate, 56a-56h ... Plate,
57 ... Bottom plate, 60 ... Internal space, 61 ... Partition plate, 61a-61d ... Plate part.

Claims (6)

The upper side is opened and the lower side is closed, and includes a polygonal speaker box body that houses a plurality of speakers therein, and a lid that covers the upper opening of the speaker box body,
The speaker box body includes a speaker mounting plate having a half shape of a truncated octagonal pyramid formed by a series of four trapezoidal plates to which a speaker is mounted, and a trapezoidal shape covering the back of the speaker mounting plate. A back plate, a bottom plate that covers the back plate and the lower opening of the speaker mounting plate, and a partition that partitions an internal space formed by the bottom plate, the speaker mounting plate, and the back plate into two symmetrical spaces Formed integrally with the board,
The lid is formed in a half shape of a regular octagon that is similar to and larger than the bottom plate, and the partition plate gradually narrows in width as the cross-sectional shape moves from the back plate toward the speaker mounting plate. The speaker box is characterized in that the width gradually decreases from the base end toward the tip end . 2. The speaker box according to claim 1, wherein left and right side surfaces of the partition plate are formed as convex curved surfaces . A speaker box comprising two speaker boxes according to claim 1 or 2 and formed into a truncated octagonal pyramid by connecting the speaker boxes back to back. The upper side is opened and the lower side is closed, and includes a polygonal speaker box body that houses a plurality of speakers therein, and a lid that covers the upper opening of the speaker box body,
The speaker box body includes a speaker mounting plate having a truncated octagonal pyramid formed by a series of eight trapezoidal plates to which a speaker is mounted, and a regular octagonal bottom plate covering a lower opening of the speaker mounting plate And a partition plate that partitions the internal space formed by the bottom plate and the speaker mounting plate into four spaces ,
The lid is formed in a regular octagon similar to and larger than the bottom plate,
The partition plate is formed of four plate portions by forming a cross shape in plan view, and the width of these plate portions becomes gradually narrower as the cross-sectional shape thereof moves from the center of the bottom plate toward the speaker mounting plate. In addition, the speaker box is characterized in that the width gradually decreases from the base end toward the tip end . The speaker box according to claim 4, wherein left and right side surfaces of the partition plate are formed as convex curved surfaces . A speaker box comprising a plurality of speaker boxes according to claim 4 or 5 , wherein the speaker boxes are connected in series in a vertical direction by a connecting member.

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