JP2007096839A - Rack for array system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rack for an array speaker (microphone) system for connecting a plurality of line array units at accurate positions. <P>SOLUTION: The plurality of line array units 2 are connected to a unit holder 13. The unit holder 13 is connected by a connecting arm 12 and connected to a base frame 11. The unit holder 13 is connected to the base frame 11 so as to have the degree of freedom in a horizontal direction and is connected to the connecting arm 12 so as to have the degree of freedom in a vertical direction. The upper and lower ends of the connecting arm 12 are connected to the upper and lower end center part of the base frame 11. The center of the connecting arm 12 is turnably connected to the base frame 11, and by turning the connecting arm 12, the unit holder 13 is moved relatively with equal distances in the horizontal direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an array system rack for connecting and holding a plurality of line array units.

  In recent years, home theaters that can enjoy the presence of a movie theater at home have become widespread. In the home theater, as represented by 5.1 channel surround, it is common to install a plurality of speakers so as to surround the listener. However, the surround system realized by such a plurality of speaker devices has a problem that wiring to each speaker device becomes complicated and a space for installing the plurality of speaker devices is required.

  In view of this, there has been proposed an audio reproducing apparatus that uses a speaker array in which a plurality of speaker units are arranged in a line, and creates a virtual sound source around the listener using the sound beam of the speaker array and reflection from the wall of the room (for example, Patent Document 1).

  FIG. 10 shows the structure of a line array speaker in the audio reproduction apparatus described in Patent Document 1. This line array speaker is configured by arranging a plurality of speaker units 21 on a line in an elongated casing. The speaker units 21 are arranged equidistantly at an interval d, and the width of the speaker array is L.

  When audio signals having the same phase are input to the plurality of speaker units 21, the synthesized wavefront of the audio output from all the speaker units 21 becomes an audio beam that is parallel and propagates only forward. The sound component propagating in a direction other than the front is canceled by combining the components output from the respective speaker units 21 (by interfering with each other), and only the component toward the front is strengthened by the combination to be a sound beam. Remain. Further, when the sound output from the speaker unit 21 is sequentially delayed from one end to the other end, the combined wavefront is inclined according to the delay time, and the sound beam can be directed obliquely.

As described above, by controlling the delay amount of the audio signals input to the plurality of speaker units, it is possible to direct the audio beam in the target direction (control the directivity).
JP-A-2005-64746

  In the line array speaker as shown in FIG. 10, when the width L of the speaker array is increased (the number of speaker units is increased), the directivity becomes sharper and the sound beam can be concentrated in the target direction. Further, when the width L of the speaker array is increased, the directivity control can be performed to the lower frequency band side.

  The beam width of the sound beam is determined by Equation 1 below (where v is the speed of sound, f is the frequency, and n is the number of speaker units).

θ = sin−1 (v / fdn) Equation 1
In order to increase the width L of the speaker array, the number of speaker units may be increased, or the distance d between the speaker units may be increased to implement the same number. However, if the distance d between the speaker units is increased, another sound beam (side lobe) is generated in addition to the target direction due to the spatial folding phenomenon, which causes a problem that directivity control in the high frequency band becomes difficult. . In order not to generate another sound beam, it is necessary to set d so as to satisfy the condition of Equation 2 below.

d <v / 2f Equation 2
For example, the low frequency side of the frequency band where the directivity can be controlled when the distance d between the speaker units is d = 4.5 cm and the width L of the speaker array is 67.5 cm is about 500 Hz from Equation 1, and the high frequency is The side is about 4 kHz from Equation 2. Therefore, the frequency band in which the directivity can be controlled is about 500 to about 4 kHz, and a band reproduction similar to a telephone voice can be performed, but the band reproduction required for home theater (for example, about 250 Hz to 12 kHz) cannot be realized. It was. In order to realize this, the number of speaker units must be increased, but there is a problem that the cost increases when the number of speaker units is increased.

  In view of this, it is conceivable to connect a plurality of line speaker arrays in the vertical direction, shift the positions to the left and right by the number of connections, and reduce the apparent distance between the speaker units. FIG. 11 is a diagram showing an array speaker system in which a plurality of line array units are connected. In the figure, an array speaker system in which three stages of line array units are connected is shown. As shown in the figure, when three stages of line array units in the vertical direction are connected to each other while being shifted to the left and right by d / 3, the apparent width of the speaker unit of the array speaker system is d / 3. Since the apparent width of the speaker unit is d / 3, the frequency band in which directivity control is possible is tripled on the high frequency side.

  However, as described above, it is difficult to connect by shifting to the right and left direction by an accurate position by “the width of the speaker unit / the number of connected array units”, and if the number of connections is changed, it is troublesome to align each time. It was. In addition, when a plurality of line array units are connected as described above, each connection wiring and power cable is complicated.

  An object of the present invention is to provide an array system rack capable of easily connecting a plurality of line array units at an accurate position.

  An array system rack according to the present invention is an array system rack that holds and connects a plurality of line array units in which a plurality of speaker units or microphone units are arranged in a straight line in a vertical direction that is perpendicular to the straight line. A plurality of unit holders respectively connected to the plurality of line array units; a connecting arm that movably connects a central portion of the plurality of unit holders; and a unit located in the center in the vertical direction of the unit holders A holder is fixed, and a base frame that rotatably fixes the central portion of the connecting arm, and the base frame and the plurality of unit holders are fixed so as to be movable only in the horizontal direction that is the direction of the straight line. And an auxiliary frame.

  In the present invention, the plurality of unit holders are connected by the connecting arm. The connecting arm is movably connected to the central portion of each unit holder. Further, the unit holder located at the center in the vertical direction and the central part of the connecting arm are connected to the base frame so as to be rotatable. Each unit holder is connected to the base frame by an auxiliary frame. The auxiliary frame fixes each unit holder so that it can move only in the left-right direction. Thereby, each unit holder can be moved right and left centering on the unit holder located in the center of an up-and-down direction by moving a connecting arm right and left.

  According to the present invention, a plurality of end portions of the connecting arm are detachably attached to the base frame so that the plurality of line array units are displaced in the horizontal direction by “intervals / integer of each speaker unit or microphone unit”. It is characterized by having a connecting arm connection point for connection at a place.

  In the present invention, both ends of the connecting arm are connected to the base frame. A plurality of connection points are installed so as to be connected to the base frame at a position shifted in the left-right direction by “interval of each speaker unit or microphone unit / integer”.

  The present invention further includes a built-in wiring portion that electrically connects the plurality of unit holders, and a line array unit connection terminal that electrically connects the unit holder and the line array unit. Features.

  In the present invention, the unit holder is electrically connected by the built-in wiring. In addition, each unit holder has a connection terminal that is electrically connected to the line array unit, whereby all the line array units are electrically connected, so that connection wiring and power cables for the line array unit are unnecessary. Become.

  According to the present invention, a plurality of line array units can be easily connected at an accurate position, and the position of each line array unit can be easily changed according to the number of connections.

Hereinafter, an array speaker system using an array system rack according to an embodiment of the present invention will be described.
FIG. 1 is a perspective view of an array speaker system according to an embodiment of the present invention as viewed from the front right side. FIG. 2 is a front view of the array speaker system. As shown in FIGS. 1 and 2, this array speaker system includes an array speaker system rack 1, and a plurality (seven in this figure) of line array units 2 fixed to the array speaker system rack 1. It is equipped with.

  The line array unit 2 has a configuration in which a plurality of speaker units are arranged in a line at equal intervals. As the speaker unit, a cone type speaker unit is generally used, but other types such as a horn type speaker unit may be used. The plurality of line array units 2 are stacked vertically in parallel at equal intervals.

  The array speaker system rack 1 includes a base frame 11, a connecting arm 12, and a plurality of unit holders 13. The base frame 11 is a substantially rectangular thin plate when viewed from the front, and has a shape like a picture frame. The base frame 11 serves as a frame for the entire array speaker system rack 1 and supports the unit holders 13 slidably in the left-right direction with the connecting pins 15 and the long holes 11D (see FIGS. 4 and 6). The connecting arm 12 is a thin bar-like arm, sandwiched between the front surface of the base frame 11 and the back surfaces of the plurality of unit holders 13, and the upper and lower ends of the connecting arm 12 are connected to the vicinity of the center of the upper and lower ends of the base frame 11. The The connecting arm 12 is connected to the center of the back surface of each unit holder 13. The connecting arm 12 connects the plurality of unit holders 13 and defines the positional relationship between them. The unit holder 13 is a substantially L-shaped horizontally long thin plate, and has flanges 13A (see FIG. 4) at both left and right ends. The line array unit 2 is sandwiched from the left and right by the flange 13A to hold the line array unit 2. The unit holder 13 electrically connects each line array unit 2.

  FIG. 3 is a front view of the array speaker system. FIG. 2A is a view when the connecting arm 12 is connected to the base frame 11 in the vertical direction. FIG. 5B is a diagram in the case where each unit holder 13 is moved relatively [speaker unit interval / 5] in the left-right direction. FIG. 6C is a diagram in a case where each unit holder 13 is moved relatively “speaker unit interval / 3” in the left-right direction.

  In FIG. 6B, each unit holder 13 is fixed to be shifted by [speaker unit interval / 5] left and right, so that the apparent speaker unit interval of the entire array speaker system is d / 5. Further, in FIG. 6C, each unit holder 13 is fixed to be shifted by [speaker unit interval / 3] left and right, so that the apparent speaker unit interval of the array speaker system as a whole is d / 3. . The base frame 11 has a plurality of pinning portions (see FIG. 5) in the vicinity of the upper center, and the unit holders 13 of these pinning portions 11C are relatively [spacing between speaker units / 2] to It is installed at five positions on the left and right sides of the center so as to be fixed by being shifted in the left-right direction by [speaker unit interval / 6]. Therefore, by removing the pin engaged with the pinning portion 11C, moving (rotating) the connecting arm 12 in the left-right direction, and engaging the pin with the other pinning portion 11C, each unit holder 13 Can be accurately and easily moved to the position [speaker unit interval / integer].

  Next, each part of the array speaker system will be described in detail. As shown in the exploded perspective view seen from the front right side of FIG. 4, the base frame 11 has a frame-like shape (hollow square shape), and has a bar shape in the horizontal direction at the center in the vertical direction of the hollow portion. The horizontal beam portion 11A is used as a support for the flat plate, and the vertical beam portion 11B is used as a flat plate support at two locations on the left and right in the vertical direction. The horizontal beam portion 11 </ b> A and the vertical beam portion 11 </ b> B are connected and fixed to each other, and their respective ends are fixed to the base frame 11.

  11 A of cross beam parts have the round hole 11F in the approximate center part. The round hole 11F and the round hole 12B at the center of the connecting arm 12 are overlapped, and the connecting pin 15 is inserted from the back, so that the connecting arm 12 is pivotally connected to the base frame 11. Further, the connecting arm 12 has a plurality of rectangular through holes 12A at equal intervals from the vicinity of both ends to the center, and among the through holes 12A, the upper and lower through holes 12A are near the upper center of the base frame 11. Is connected to one of the plurality of pinning portions 11C provided in the. FIG. 5 is an enlarged front view of the base frame 11 near the upper center. As shown in the figure, the base frame 11 has a plurality of pinning portions 11C near the upper center. The positioning pin 14 penetrates the through hole 12A of the connecting arm 12 and engages with the pin fastening portion 11C. Although not shown, the same applies to the vicinity of the lower center of the base frame 11. In this way, the connecting arm 12 is connected to the base frame 11.

  Further, the connecting arm 12 penetrates the connecting pin 15 into the other through-hole 12 </ b> A from the back surface, and is connected to the vicinity of the center of the back surface of the unit holder 13. FIG. 6 is an exploded perspective view of the array speaker system as viewed from the rear left side. As shown in FIG. 6, the unit holder 13 has a small convex portion 13D near the center of the back surface, and this small convex portion 13D is inserted into the through hole 12A or the central round hole 12B of the connecting arm 12, It connects with the connecting pin 15 penetrated from the back. In this way, the unit holder 13 positioned in the center in the vertical direction is connected to the connecting arm 12 without any degree of freedom, and the degree of freedom in the vertical direction is increased except for the unit holder 13 positioned in the center in the axial direction of the connecting arm. In this state, the connecting arm 12 is connected.

  In FIG. 4, the vertical beam portion 11 </ b> B has a plurality of rectangular long holes 11 </ b> D that are long in the horizontal direction at equal intervals in the vertical direction. Moreover, it has the round hole 11E in the center part of an up-down direction. The connecting pin 15 is inserted into the long hole 11D or the round hole 11E from the back surface, and the connecting pin 15 and the back surface of the unit holder 13 are connected to hold the unit holder 13 on the base frame 11. As shown in FIG. 6, the unit holder 13 has a plurality of cylindrical projecting portions 13C on the back surface, and these projecting portions 13C are inserted into the long holes 11D or the round holes 11E and penetrated from the back surface. It is connected to the connecting pin 15. Thus, the unit holder 13 other than the unit holder 13 positioned at the center in the vertical direction is held by the base frame 11 so as to be slidable in the horizontal direction. The unit holder 13 located at the center in the vertical direction is held by the base frame 11 without any degree of freedom in the horizontal direction because the overhanging portion 13C is inserted into the round hole 11E and connected to the connecting pin 15.

  Therefore, as shown in the enlarged view near the center of the back surface of FIG. 7, when the connecting arm 12 is rotated in the left-right direction with the center portion as a fulcrum, the unit holder 13 connected thereto is parallel in the left-right direction. Will move.

  A unit holder 13 for fixing the elongated rectangular parallelepiped array unit 2 has a flange portion 13A at the left and right ends of a substantially L-shaped thin plate, and a connector 13B near the center. The connector 13B is a terminal electrically connected to the array unit 2 (supplying audio signals and power), and the line array units 2 are electrically connected to each other via the connector 13B. Although not shown, each unit holder 13 is electrically connected to the base frame 11 via an electric wiring, and the line array unit receives an audio signal input from an input terminal or the like installed on the base frame 11. 2 can be supplied. In addition, power input from a power supply terminal (power outlet or the like) installed on the base frame 11 can be supplied to the line array unit 2.

  In FIG. 4, the front surface near the center of the upper and lower ends of the base frame 11 and the front surface of the cross beam portion 11 </ b> A are recessed on the back side (or located on the back side) by the thickness of the connecting arm 12. When the connecting arm 12 comes into contact therewith, the front surface of the base frame 11 and the front surface of the connecting arm 12 are flush with each other, and the plurality of unit holders 13 are arranged in parallel.

  As described above, the unit holders 13 are overlapped in the vertical direction in parallel at equal intervals. Therefore, when the connecting arm 12 is rotated in the left-right direction with the central portion as a fulcrum, it is connected to this. The unit holders 13 are moved in parallel in the left-right direction, and the unit holders 13 move relatively equidistantly.

  As described above, the beam width of the sound beam output from the array speaker system is determined by Equation 1 {θ = sin−1 (v / fdn)} so that a sound beam in another direction due to the spatial folding phenomenon is not generated. In order to satisfy the formula 2 (d <v / 2f), the interval between the speaker units must be set, but the array speaker system of this embodiment moves and changes the positions of the plurality of line array units 2 to the left and right. Therefore, the apparent speaker unit interval can be easily changed according to the required frequency band, and the frequency band in which the directivity can be controlled can be improved.

  For example, as shown in FIG. 3B, when the line array unit 2 is moved by d / 5 in the left-right direction, the frequency band in which the directivity can be controlled can be improved five times to the high frequency side. If the line array unit 2 is moved by d / 3 in the left-right direction as in (), the frequency band in which the directivity can be controlled can be improved three times to the high frequency side.

  The line array unit 2 is electrically connected via the unit holder 13, and synchronized audio signals are supplied to all the line array units 2. Any one of the line array units 2 serves as a master unit of the array speaker system, and controls the directivity of the entire array speaker system as one speaker array.

  Here, the electrical connection of the array speaker system will be described. FIG. 8 is a diagram showing electrical connection of the array speaker system. As shown in the figure, the audio input terminal installed in the base frame 11 is connected to the connector 13B of each unit holder 13 via a built-in wiring. The connector 13 </ b> B of each unit holder 13 is connected to the line array unit 2. The audio signal input to the audio input terminal of the base frame 11 is input to any one connector 13B or all the connectors 13B via the built-in wiring and supplied to the line array unit 2. Each line array unit 2 is connected to the connector 13B via a built-in wiring, and can send and receive signals to and from each other.

  Next, the configuration of each line array unit 2 of the array speaker system of this embodiment will be described in detail. FIG. 9 is a block diagram showing the configuration of each line array unit 2. As shown in the figure, the line array unit 2 includes n speaker units 21-1 to 21-n, a directivity control unit 22, a control unit 23, a clock switching unit 24, and a conversion unit 25. .

  The n speaker units 21-1 to 21-n are connected to the directivity control unit 22, and the directivity control unit 22 is connected to the control unit 23, the clock switching unit 24, and the conversion unit 25.

  The directivity control unit 22, the control unit 23, and the clock switching unit 24 are connected to the directivity control unit 22, the control unit 23, and the clock switching unit 24 of the other line array unit 2, respectively. The directivity control unit 22, the control unit 23, and the clock switching unit 24 are connected via the connector 13B described above.

  The directivity control unit 22 supplies the input audio data to the speaker units 21-1 to 21-n with a predetermined delay amount to control the directivity of the speaker array. Each delay amount is set by the control unit 23. Each of the speaker units 21-1 to 21-n D / A converts the input audio data and emits the sound.

  The control unit 23 controls the clock switching unit 24 and the directivity control unit 22. Furthermore, the control part 23 of any one of the line array units 2 to be connected also controls the other connected line array units 2. Specifically, when these line array units 2 are connected to the array speaker system rack 1, any one of the line array units 2 becomes a master unit, and the control unit 23 of the master unit controls the other line array units 2. To do. The other line array unit 2 becomes a slave unit and operates based on the control of the control unit 23 of the master unit. The assignment of master and slave may be determined by a switch (not shown) or the like provided on the back surface of the line array unit 2. For example, the line array unit 2 positioned at the center in the vertical direction may be assigned to the master unit.

  The clock switching unit 24 is connected to a crystal oscillator (not shown) built in the speaker device, supplies a reference clock to the directivity control unit 22, and supplies the reference clock to the other line array units 2 to be connected. Forward. All the directivity control units 22 of the connected line array units 2 operate based on this reference clock. The clock switching unit 24 of the master unit supplies the reference clock read from the crystal oscillator built in the speaker device to the directivity control unit 22, and the clock switching unit 24 of the slave unit controls the directivity of the reference clock received from the master unit. Supplied to the unit 22.

  The conversion unit 25 converts the analog audio signal input from the audio device via the base frame 11 and the unit holder 13 into a digital signal, and the sampling frequency of the audio data when digital audio data is input. A frequency conversion function for converting (for example, 44.1 kHz) into a reference frequency (for example, 48 kHz) of the line array unit 2. The converted audio data is supplied to the directivity control unit 22.

  Based on an instruction from the control unit 23, the directivity control unit 22 sends the audio data input from the conversion unit 25 (or another line array unit) to the speaker units 21-1 to 21-n with a predetermined delay amount. Supply. Further, the audio data is transferred to the directivity control unit 22 of the other line array unit 2 to be connected. The directivity control unit 22 of the master unit supplies the audio data input from the conversion unit 25 to the speaker units 21-1 to 21-n with a predetermined delay amount. The directivity control unit 22 of the slave unit supplies the audio data transferred from the master unit to the speaker units 21-1 to 21-n with a predetermined delay amount. The delay amount of the audio data supplied to each speaker unit is set by the control unit 23 of the master unit.

  Next, directivity control of this array speaker system will be described in detail. When the user connects an audio device to an input terminal installed on the base frame 11 and inputs an audio signal, any one of the line array units 2 becomes a master unit of the array speaker system. This master unit controls the other connected line array unit 2 (slave unit). Any one of the line array units 2 may be automatically selected as a master unit, or may be manually selected by a user. FIG. 9A is a block diagram of the master unit, and FIG. 9B is a block diagram of the slave unit.

  In FIG. 2A, the control unit 23 of the line array unit 2 that becomes the master unit sets its own clock switching unit 24 to read the reference clock from the built-in crystal oscillator. The clock switching unit 24 supplies a reference clock to the directivity control unit 22. The directivity control unit 22 operates with a reference clock supplied from the built-in crystal oscillator.

  Further, the clock switching unit 24 of the master unit transfers the reference clock to the clock switching unit 24 of the slave unit. Further, the control unit 23 of the master unit transmits an instruction to the control unit 23 of the slave unit so that the clock switch 24 of the slave unit reads the reference clock received from the master unit.

  In the master unit, the conversion unit 25 digitally converts an audio signal input from the audio device and supplies the converted audio signal to the directivity control unit 22 as audio data. The directivity control unit 22 supplies audio data to each speaker unit 21 with a predetermined delay amount. These delay amounts are set by the control unit 23. In addition, the directivity control unit 22 transfers the audio data input from the conversion unit 25 to the directivity control unit 22 of the slave unit.

  In FIG. 2B, the control unit 23 of the line array unit 2 that has become a slave unit reads the reference clock received from the master unit to its own clock switching unit 24 based on an instruction from the control unit 23 of the master unit. Set as follows. The clock switching unit 24 of the slave unit supplies the reference clock received from the master unit to the directivity control unit 22. The directivity control unit 22 of the slave unit operates with the reference clock received from the master unit. The clock switching unit 24 transfers the reference clock received from the master unit to other slave units.

  The directivity control unit 22 receives the audio data transferred from the master unit, supplies the audio data to each speaker unit 21 with a predetermined delay amount, and transfers the audio data to other slave units. Since the directivity control units 22 of the slave units all operate with the reference clock received from the master unit, synchronized digital audio data is supplied to all the connected line array units 2.

  In the slave unit, the delay amount of the audio data supplied to each speaker unit is set by the control unit 23 of the master unit. The control unit 23 of the master unit sets the delay amount of each directivity control unit 22 via the control unit 23 of the slave unit. Here, the control unit 22 of the master unit controls the directivity of the entire array speaker system as one speaker array. That is, it is assumed that the line array units 2 connected vertically are all on the same line, and the respective delay amounts are set. Thereby, the directivity characteristics of the entire array speaker system can be controlled.

  In the above embodiment, an example in which an audio signal is input to the master unit and transferred to the slave unit has been shown. However, an audio signal is directly input from each audio device to each of the line array units 2, and thereafter Each directivity control unit 22 may synchronize audio data. In this case, the audio signal is also input to the conversion unit 25 in the slave unit, and the conversion unit 25 converts the audio signal into digital data and supplies the audio data to the directivity control unit 22.

  As described above, the array speaker system in the present embodiment connects and synchronizes a plurality of line array units 2. The apparent speaker unit interval of this array speaker system can be easily changed from 1/2 to 1/6 by rotating the connecting arm 12, and with respect to a single line array unit 2, If necessary, it is possible to improve the frequency at which directivity control can be easily performed.

  In this embodiment, the array system rack capable of connecting seven stages in the vertical direction has been described. However, the present invention is not limited to this configuration example. Four stages may be connected in the vertical direction, or two stages may be connected. In the present embodiment, the array speaker is described as the line array unit. However, the array system rack of the present invention can be applied even to an array microphone.

Perspective view of the array speaker system viewed from the front right side Front view of array speaker system Front view of array speaker system An exploded perspective view of the array speaker system viewed from the front right side Front enlarged view near the upper center of the base frame 11 An exploded perspective view of the array speaker system as viewed from the rear left side Enlarged view of the back of the base frame 11 near the center Diagram showing electrical connection of array speaker system Block diagram of line array unit Diagram showing line array unit The figure which shows the state where the line array unit was piled up

Explanation of symbols

1-rack for array speaker system 2-line array unit 11-base frame 12-connecting arm 13-unit holder 14-positioning pin 15-connecting pin

Claims (3)

A rack for an array system that holds a plurality of speaker units or line array units in which microphone units are arranged on a straight line in a vertical direction that is perpendicular to the straight line.
A plurality of unit holders respectively connected to the plurality of line array units;
A connecting arm that movably connects the center of the plurality of unit holders;
A base frame that fixes a unit holder located at the center in the vertical direction among the unit holders, and fixes a central part of the connecting arm so as to be rotatable,
An auxiliary frame that fixes the base frame and the plurality of unit holders so as to be movable only in a horizontal direction that is the direction of the straight line;
Rack for array system equipped with. Both ends of the connecting arm
2. The arm connection points for connection that connect the base frame at a plurality of locations so that the plurality of line array units can be detachably attached so as to be shifted in the horizontal direction by "space between each speaker unit or microphone unit / integer". The rack for array systems described in 1. A built-in wiring portion for electrically connecting the plurality of unit holders;
A line array unit connection terminal for electrically connecting the unit holder and the line array unit;
The rack for an array system according to claim 1 or 2, further comprising:

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