JP2008109222A - Impedance switching device for speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an input impedance switch 30 of a speaker 20 compact and to secure an installation place for a fuse. <P>SOLUTION: The switch 30 has a speaker-side terminal array 42, an amplifier-side terminal array 43, and a mounting part array 46. Terminals VC1± and VC2± of the terminal array 42 are connected to both ends of voice coils VC1 and VC2. Terminals A1± and A2± of the terminal array 42 are connected by switching output lines of audio amplifiers AMP according to bi-amplifier connection, series connection, or parallel connection. The mounting part array 46 has mounting parts 47 to 50 in an array along the width of the fuse 32. Wirings 54 connect the respective terminals of the terminal arrays 43 and 44 and mounting part array 46 so that the fuse 32 is mounted on the mounting parts 47 and 50 to make the bi-amplifier connection, on the mounting parts 49 and 50 to make the series connection (provided that the fuse 32 on the mounting part 50 is in a no-current state), and on the mounting parts 47 and 48 to make the parallel connection. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a switching device for input impedance of a speaker equipped with two voice coils, and more particularly to a switching device capable of switching the input impedance of a speaker by changing the mounting location of a connection conductor such as a fuse.

In Patent Document 1, jumper wires or fuses (hereinafter referred to as “jumper wires” and “fuses” are collectively referred to as “connection conductors” without changing the connection of the two voice coils of the speaker to the respective ± terminals. The speaker input impedance switching device that can switch the input impedance of the speaker as appropriate by attaching and detaching () is disclosed. That is, a groove (channel 26 in FIG. 4B of Patent Document 1) in which a connecting conductor having a unit length (L in FIGS. 8 and 9 of Patent Document 1) can be detachably mounted is formed, and two voice coils are connected by bi-amplifier. As shown in FIG. 5 of Patent Document 1, the connection conductor is removed, and when two voice coils are used in series connection, as shown in FIG. As described above, one connection conductor (reference numeral 36 in FIG. 6 of Patent Document 1) is mounted between C2− and C1 + in the longitudinal center of the groove, and two voice coils are used in parallel connection. In this case, as shown in FIG. 7 of Patent Document 1, two connection conductors (reference numeral 36 in FIG. 7 of Patent Document 1) are connected between C1- and C2- on the left end side in the groove longitudinal direction, and Install between C1 + and C2 + on the right end side.
US Patent Application Publication No. 2004/196987

  The problems of the speaker input impedance switching device of Patent Document 1 are as follows.

(A) The groove is a conductor rod for mutually connecting the amplifier side terminals A1-, A2-, A1 +, A2 + and the coil side terminals C1-, C2-, C1 +, C2 + (reference numeral 20 in FIG. 4 of Patent Document 1). As a result, the interval between adjacent conductor bars must be secured by the length of one connecting conductor, and the groove extends in the longitudinal direction of the conductor bar. The length in the row direction of the row and the length of the groove are increased, which hinders downsizing of the speaker input impedance switching device.

(B) When the voice coil is used in a bi-amplifier (BI-AMP) connection, it is necessary to remove all the connection conductors from the grooves, so it is difficult to replace the connection conductors in the grooves with fuses. This is disadvantageous because the fuse for preventing overcurrent needs to be secured in a location different from the groove.

(C) In each of the bi-amplifier connection, the series connection, and the parallel connection, the number of connection conductors to be mounted in the groove is different, and the connection conductors that are not used need to be stored in another place by the user, and the storage of the connection conductors is complicated In addition, the connection conductor is easily lost.

(D) In order to prevent erroneous mounting of the connection conductor, if a cover is to be applied to the groove portion that prevents mounting, in the case of bi-amp connection, one long cover that covers the entire groove is connected in series. In this case, it is necessary to use one short cover at each of the left and right ends of the groove, and in the case of parallel connection, it is necessary to have no cover, increasing the number of covers and storing unused covers. It becomes complicated and the cover is easily lost.

  An object of the present invention is to provide a speaker input impedance switching device that can overcome the above-mentioned problems.

  In the input impedance switching device for a speaker of the present invention, the mounting portions for mounting the connection conductor are arranged in a line in the short direction of the connection conductor. In addition, all the terminals of the mounting section row are positioned away from each other without overlapping each other, and the wiring circuit is connected to one or more connecting conductors in the bi-amp connection, series connection and parallel connection of the voice coil. By connecting to the mounting part corresponding to the above, the terminal of the mounting part row, the speaker side terminal and the amplifier side terminal are connected so as to be switched.

That is, the speaker input impedance switching device of the present invention has the following.
A plurality of speaker side terminals respectively connected to the respective terminals of the two voice coils of the speaker;
Multiple amplifier side terminals to which each output line of the audio amplifier is connected according to the bi-amp connection, series connection and parallel connection of the voice coil,
A mounting part row in which each mounting part is detachably attachable and all terminals of all the mounting parts are positioned away from each other, and each mounting part is arranged in a line in the short direction of the connecting conductor, and a voice coil The bi-amp connection, the series connection and the parallel connection are switched by attaching one or more connection conductors to the attachment part corresponding to each connection, between the terminal of the attachment part row, the speaker side terminal and the amplifier side terminal. Connecting wiring circuit.

  According to the present invention, the mounting portions for mounting the connection conductors are arranged in a line in the short direction of the connection conductor, so that the space for the mounting portion row is reduced, and further, the speaker input impedance switching device can be downsized. Figured. In addition, the wiring circuit of the speaker input impedance switching device is switched so that the bi-amp connection, series connection, and parallel connection of the voice coil are switched by mounting one or more connection conductors on the mounting portion corresponding to each connection. Since the terminals of the mounting section, the speaker side terminal, and the amplifier side terminal are connected, when a fuse is used as the connection conductor, it is installed for all of the bi-amp connection, series connection, and parallel connection of the voice coil. The substring can be used as a fuse installation location. That is, it is possible to omit the trouble of securing the fuse installation location in a location different from the mounting portion row.

  FIG. 1 is a schematic perspective view of the bobbin 10. The voice coil VC1 and the voice coil VC2 are wound around the side surface of the bobbin 10 at a portion away from the bobbin 10 in the axial direction. The lead wires 14 and 15 extend from the winding portion of the voice coil VC <b> 1 in the axial direction of the bobbin 10 and reach the top surface 11 of the bobbin 10. The lead wires 17 and 18 extend from the winding portion of the voice coil VC2 in the axial direction of the bobbin 10 and reach the top surface 11 of the bobbin 10.

  FIG. 2 is a schematic cross-sectional view of the speaker 20 including the bobbin 10. The speaker cone 27 is coaxially disposed with respect to the speaker basket 24, and the peripheral portion of the front surface portion of the speaker basket 24 is raised with its large-diameter side peripheral portion slightly raised forward from the front opening of the speaker basket 24. The small-diameter side end is advanced to a sufficient depth in the speaker basket 24.

  The bobbin 10 is fitted and fixed to the small-diameter side end of the speaker cone 27 at the periphery of the front end, and is displaced in the axial direction of the speaker 20 integrally with the small-diameter side end. The cylindrical magnet 25 has a rear surface side fixed to the inner surface side end surface of the speaker basket 24, and a rear end portion of the bobbin 10 is inserted inward from the front end opening side so as to be relatively displaceable.

  The input impedance switch 30 is disposed on the outer surface side of the speaker basket 24, and ends of the lead wires 14, 15, 17, and 18 are connected to C1 +, C1-, C2 +, and C2-, respectively. A1 +, A1-, A2 +, A2- of the input impedance switch 30 are connected to the audio amplifiers AMP1 and 2 (FIGS. 7 to 9) in a separable manner.

  FIG. 3 is a perspective view of the fuse 32. The fuse 32 is detachably attached to the input impedance switch 30. The fuse 32 includes a fuse main body 33 and two legs 34 protruding from both longitudinal ends of the fuse main body 33. Leg 34 acts as a terminal for fuse 32. L and S are dimensions of the fuse body 33 in the longitudinal direction and the short direction, respectively.

  FIG. 4 is a perspective view of the jumper wire 36. The jumper wire 36 is attached to the input impedance switch 30 and is cylindrical in this example. L and S are the dimensions of the jumper wire 36 in the longitudinal direction and the lateral direction, respectively. The lengths L and S of the fuse body 33 and the lengths L and S of the jumper wire 36 are the same.

  That is, the input impedance switch 30 can be equipped with the fuse 32 shown in FIG. 3, or the jumper wire 36 shown in FIG. 4 can be attached instead of the fuse 32. When the fuse 32 of FIG. 3 is mounted, the fuse 32 is a measure against overcurrent of the voice coils VC1 and VC2.

  FIG. 5 is a diagram showing the internal and external wiring states in the input impedance switch 30. The input impedance switch 30 includes a printed circuit board 41, and a speaker side terminal array 42 and an amplifier side terminal array 43 are disposed on the side edges of the printed circuit board 41 on the speaker side and the non-speaker side. The speaker side terminal row 42 includes four terminals VC1 +, VC1-, VC2 +, VC2- arranged in a line at equal intervals along the side edge of the printed circuit board 41. The terminals VC1 +, VC1-, VC2 +, VC2- of the speaker side terminal array 42 are connected to the ends of the lead wires 14, 15, 17, 18 from the voice coils VC1, VC2 of the speaker 20, respectively.

  The amplifier-side terminal array 43 includes four terminals A1 +, A1-, A2 +, A2- arranged in a line at equal intervals along the side edge of the printed circuit board 41. Cables from the audio amplifiers AMP1 and AMP2 (FIGS. 7 to 9) are detachably connected to the terminals A1 +, A1-, A2 +, and A2- of the amplifier-side terminal array 43.

  The mounting portion row 46 is disposed at an intermediate portion between the speaker side terminal row 42 and the amplifier side terminal row 43 and includes four mounting portions 47, 48, 49, and 50. These mounting portions 47, 48, 49, 50 are arranged in a row in parallel to the column direction of the speaker side terminal row 42 and the amplifier side terminal row 43. The mounting portions 47, 48, 49, and 50 each include a pair of terminals 47a and 47b, a pair of terminals 48a and 48b, a pair of terminals 49a and 49b, and a pair of terminals 50a and 50b. The mounting portions 47, 48, 49, 50 of the mounting portion row 46 are arranged in a row in the short direction of the fuses 32 and the like attached to them.

  In order to adapt the mounting of the fuse 32 in the mounting portion row 46, each terminal of the mounting portion row 46 has a socket structure in which the plate-like leg 34 of the fuse 32 can be inserted and removed. Further, in order to adapt to the mounting of the jumper wire 36, each pair of terminals of the mounting portion row 46 has a socket structure that receives the end portion of the columnar jumper wire 36 inward and is elastically clamped. The

  The wiring 54 is made of a film formed by metal vapor deposition on the printed circuit board 41, and has terminals VC1 +, VC1-, VC2 +, VC2-, A1 +, A1-, A2 +, A2-, 47a, 47b, 48a, 48b, 49a. , 49b, 50a, 50b are given a predetermined connection relationship. The connection relationship by the wiring 54 will be described in detail.

  Terminal A1 + is connected to terminals VC1 +, 48b. Terminal A1- is connected to terminals 47a, A2- and VC2-. Terminal A2 + is connected to terminal 50a.

  The terminal 48a is connected to the terminals 49a, 50b and VC2 +. The terminal 47b is connected to the terminals VC1- and 49b.

  As a result of the mounting portions 47, 48, 49, 50 being arranged in a row in the short direction of the fuse 32, the mounting portion row 46 is reduced in size compared to the case where they are arranged in the longitudinal direction. This contributes to the downsizing of the vessel 30.

  FIG. 6 is a front view of the input impedance switch 30. The mounting portions 47, 48, 49, 50 are arranged in a row in the short direction of the fuse 32 to be mounted on them, and are disposed in the mounting portion region 59. The vertical and horizontal dimensions of the mounting portion region 59 are 4S × L (S and L are defined in FIGS. 3 and 4).

  The mounting portion area 59 shown is suitable for mounting the fuse 32 (FIG. 3), not the cylindrical jumper wire 36 (FIG. 4), and the mounting portions 47, 48, 49 of the mounting portion region 59. , 50 have left and right slit insertion holes 58 through which the flat leg 34 of the fuse 32 is inserted and removed. A 2S × L cover plate 70 (FIGS. 7 to 9) is attached to the attachment portion region 59 so that the position in the row direction of the attachment portion row 46 can be adjusted. The cover plate 70 may be a sliding type that slides in the vertical direction of the mounting portion region 59 or a detachable type.

  As described above, the terminals VC1 +, VC1-, VC2 +, VC2- of the input impedance switching unit 30 are fixedly connected to the terminals VC1 +, VC1-, VC2 +, VC2- of the voice coils VC1, VC2, respectively. A nut 57 is provided in A1 +, A1-, A2 +, A2- of the input impedance switching device 30, and the end of the cable from ± of the audio amplifiers AMP1, AMP2 (FIGS. 7 to 9) can be tightened freely. ing.

  When the impedances of the voice coils VC1 and VC2 are both 2Ω, the input impedance of the speaker 20 in the bi-amplifier connection (BI-AMP), the series connection, and the parallel connection is as follows. That is, 2 + 2Ω for bi-amp connection, 4Ω for series connection, and 1Ω for parallel connection.

  FIG. 7 shows the wiring and the mounting position of the fuse 32 when the voice coils VC1 and VC2 are used in a bi-amplifier connection. Cables 64 and 65 connect the outputs + and − of the audio amplifier AMP1 to terminals A1 + and A1−, respectively. Cables 66 and 67 connect the outputs + and-of the audio amplifier AMP2 to terminals A2 + and A2-, respectively.

  The position of the cover plate 70 is fixed to the mounting portion row 46 in advance by the user so as to cover the range of the mounting portions 48 and 49 in the short direction of the fuse 32 at an appropriate time. As a result, the user correctly attaches the fuse 32 to the attachment portions 47 and 50 without attaching the fuse 32 to the attachment portions 48 and 49 by mistake in the bi-amplifier connection of the voice coils VC1 and VC2.

  The output currents of the audio amplifiers AMP1 and AMP2 when the voice coils VC1 and VC2 are connected to the bi-amplifier flow as follows. The output current of the audio amplifier AMP1 flows in the order of AMP1 + → terminal A1 + → terminal VC1 + → voice coil VC1 → terminal VC1- → terminal 47b → fuse 32 → terminal 47a → terminal A1- → AMP1-. The output current of the audio amplifier AMP2 flows in the order of AMP2 + → terminal A2 + → terminal 50a → fuse 32 → terminal 50b → terminal VC2 + → voice coil VC2 → terminal VC2- → terminal A2- → AMP2-. With respect to such a current flow, the fuses 32 mounted on the mounting portions 47 and 50 play a role of preventing overcurrent of the voice coils VC1 and VC2, respectively.

  FIG. 8 shows the wiring and the mounting position of the fuse 32 when the voice coils VC1 and VC2 are used in series connection. Cables 64 and 65 connect outputs + and − of the audio amplifier AMP1 to terminals A1 + and A2−, respectively. The position of the cover plate 70 is fixed to the mounting portion row 46 in advance by the user so as to cover the range of the mounting portions 47 and 48 in the short direction of the fuse 32 at an appropriate time. As a result, the user correctly attaches the fuse 32 to the attachment portions 49 and 50 without attaching the fuse 32 to the attachment portions 47 and 48 by mistake in the series connection of the voice coils VC1 and VC2.

  When the voice coils VC1 and VC2 are connected in series, the output current of the audio amplifier AMP1 flows as follows. AMP1 + → terminal A1 + → terminal VC1 + → voice coil VC1 → terminal VC1- → terminal 49b → fuse 32 → terminal 49a → terminal 50b → terminal VC2 + → voice coil VC2 → terminal VC2- → terminal A2- → AMP1- With respect to such a current flow, the fuse 32 attached to the attachment portion 49 plays a role of preventing overcurrent of the voice coils VC1 and VC2 connected in series, but the fuse attached to the attachment portion 50 is used. No. 32 is simply mounted on the mounting portion 50 because no current flows because the terminal A2 + is in an open state. However, since the user can store the remaining fuses 32 by mounting them on the mounting unit 50 without preparing another storage location, management becomes easier and loss can be effectively prevented.

  FIG. 9 shows the wiring and the mounting position of the fuse 32 when the voice coils VC1 and VC2 are used in parallel connection. Cables 64 and 65 connect outputs + and − of the audio amplifier AMP to terminals A1 + and A2−, respectively. The position of the cover plate 70 is fixed to the mounting portion row 46 in advance by the user so as to cover the range of the mounting portions 49 and 50 in the short direction of the fuse 32 at an appropriate time. As a result, thereafter, the user correctly attaches the fuse 32 to the attachment portions 47 and 48 without attaching the fuse 32 to the attachment portions 49 and 50 in parallel connection of the voice coils VC1 and VC2.

  When the voice coils VC1 and VC2 are connected in parallel, the output current of the audio amplifier AMP1 flows as follows. The supply current to the voice coil VC1 flows in the order of AMP1 + → terminal A1 + → VC1 + → voice coil VC1 → terminal VC1- → terminal 47b → fuse 32 → terminal 47a → terminal A2- → AMP1-. The supply current to the voice coil VC2 flows in the order of AMP1 + → terminal 48b → fuse 32 → terminal 48a → terminal 49a → terminal 50b → terminal VC2 + → voice coil VC2 → terminal VC2- → terminal A2- → AMP1-. With respect to such a current flow, the fuses 32 mounted on the mounting portions 47 and 48 play a role of preventing overcurrent of the voice coils VC1 and VC2, respectively.

  FIG. 10 shows the connection relationship between the input impedance switchers 30a and 30b and the audio amplifier AMP1 in the case of so-called serial connection. In the serial connection, in each speaker, the voice coils VC1 and VC2 are connected in series (serial), the speakers are connected in parallel, and one audio amplifier AMP1 drives the two speakers simultaneously. It is. In each of the input impedance switching devices 30a and 30b in FIG. 10, elements common to the input impedance switching device 30 in FIG.

  In FIG. 10, input impedance switchers 30a and 30b are arranged in respective speakers (not shown), and the input impedance switchers 30a and 30b use voice coils VC1 and VC2 of each speaker in series connection. The two fuses 32 are attached to the attachment portions 49 and 50, respectively, as in the case of the input impedance switching device 30 of FIG.

  The cables 64a and 65a connect the + and − of the audio amplifier AMP1 to the terminals A1 + and A1− of the input impedance switch 30a, respectively. The cables 64b and 65b connect the terminals A1 + and A2- of the impedance switch 30a to the terminals A1 + and A2- of the input impedance switch 30b, respectively. As can be seen from FIG. 5 described above, the terminals A1- and A2- of the input impedance switch 30a are short-circuited, and the cable 65a connects AMP1- to A2- instead of the terminal A1- of the input impedance switch 30a. You may connect.

  The relationship between the illustrated input impedance switch 30 and each element of the present invention will be described. Terminals VC1 +, VC1-, VC2 +, VC2- in the speaker-side terminal row 42 correspond to a plurality of speaker-side terminals of the present invention. The plurality of speaker side terminals of the present invention are connected to the respective terminals of the two voice coils of the speaker.

  A1 +, A1-, A2 +, A2- in the amplifier side terminal row 43 correspond to a plurality of amplifier side terminals of the present invention. The plurality of amplifier-side terminals of the present invention are connected to the output lines of the audio amplifier according to the bi-amp connection, series connection, and parallel connection of the voice coil.

  The mounting portion row 46 corresponds to the mounting portion row of the present invention. In the mounting portion row of the present invention, each mounting portion can freely attach and detach the connection conductor, and all the terminals of the all mounting portions (eg, terminals 47a, 47b, 48a, 48b, 49a, 49b, 50a, 50b in FIG. 5) are The mounting portions are arranged in a row in the short direction of the connection conductor while being spaced apart from each other.

  The plurality of wirings 54 correspond to the wiring circuit of the present invention. The wiring circuit of the present invention is configured so that the bi-amp connection, series connection and parallel connection of the voice coil are switched by mounting one or more connection conductors to the mounting portion corresponding to each connection, The speaker side terminal and the amplifier side terminal are connected.

  As a result of arranging the mounting portions in a row in the short direction of the connection conductor, the mounting portion row can be reduced, and thus the speaker input impedance switching device can be reduced in size.

  In any of the bi-amp connection, series connection and parallel connection of the voice coil, it is necessary to mount one or more connection conductors on any mounting part of the mounting part row in order to realize the connection. When a fuse is employed, it is possible to eliminate the need to prepare a place for arranging the fuse separately from the mounting part row.

  In the speaker input impedance switching device of the present invention, preferably, the wiring circuit includes two bi-amp connections, series connections, and parallel connections of the voice coil to the mounting unit row (for example, the mounting units 47 and 50 in FIG. 7). The wiring circuit is achieved by mounting one (for example, mounting portion 49 in FIG. 8) and two (for example, mounting portions 47 and 48 in FIG. 9) connection conductors. When the voice coils are connected in series, another mounting portion (for example, the mounting portion 50 in FIG. 8) is maintained in a no-current state even when the connection conductor is mounted on the mounting portion. It is a wiring circuit.

  In this way, the two connecting conductors can be secured in the mounting part row in common for the bi-amplifier connection, the series connection and the parallel connection, thereby eliminating the trouble of preparing a storage place for the connecting conductor separately from the mounting part row. In addition, the loss of the connection conductor can be suppressed.

  In the input impedance switching device for a speaker according to the present invention, preferably, the mounting portion row includes a total of four mounting portions (for example, the mounting portions 47, 48, 49, and 50 in FIG. 5). The wiring circuit has two other mounting parts (for example, the mounting parts hidden in the cover plate 70 in FIG. 7) other than the two mounting parts on which the connection conductors are mounted to achieve bi-amp connection and parallel connection of the voice coil. 48, 49, in FIG. 9, the mounting portions 49, 50 hidden in the cover plate 70, and one mounting portion for mounting the connection conductor to achieve the series connection of the voice coils (for example, the mounting in FIG. 8). Part 49) and two other mounting parts (for example, cover in FIG. 8) except for one mounting part (for example, mounting part 50 in FIG. 8) in which the connection conductor is maintained in a non-current state. The mounting portions 47 and 48) hidden in the plate 70 are wiring circuits that become non-mounting row portions as two consecutive mounting portions in the mounting portion row. A covering member (eg, a cover plate 70 having a dimension of 2S × L in FIG. 7 or the like) is mounted so as to cover the non-mounted row portion.

  Thus, by using a common cover member for the bi-amp connection, series connection and parallel connection of the voice coil, mounting of the connection conductor to the wrong mounting portion is prevented. Further, since the covering member is used for any connection, it can be prevented from being stored in another place or lost.

  In the typical wiring circuit of the present invention, in the case of the bi-amp connection of the voice coil, the two mounting portions to which the connection conductors are mounted are replaced with the first and fourth mounting portions from one end side of the mounting portion row (example: FIG. 7 mounting portions 47, 50). In the case of parallel connection of voice coils, the two mounting portions for mounting the connection conductors are the first and second mounting portions (for example, mounting portions 47 and 48 in FIG. 9) from one end of the mounting portion row. . In the case of the series connection of the voice coils, the mounting portion in which the connection conductor is maintained in a non-current state even if it is mounted on one mounting portion where the connection conductor is mounted is the third and fourth from the one end side of the mounting portion row. One of the second mounting portions (for example, the mounting portion 49 in FIG. 8) and the other (for example, the mounting portion 50 in FIG. 8).

  Although the present invention has been described with respect to various specific embodiments, the present invention is not limited to this, and each component in the various specific embodiments is modified (including deletion) without departing from the gist of the invention. And can be materialized. Various inventions can also be formed by replacing constituent elements between various specific forms or combining a plurality of constituent elements in various specific forms.

It is a schematic perspective view of a bobbin. It is a schematic sectional drawing of the speaker containing a bobbin. It is a perspective view of a fuse. It is a perspective view of a jumper wire. It is a figure which shows the internal and external wiring state in an input impedance switch. It is a front view of an input impedance switch. It is a figure which shows the wiring and the mounting position of a fuse in the case of using a voice coil by bi-amp connection. It is a figure which shows the wiring and the mounting position of a fuse in the case of using a voice coil by serial connection. It is a figure which shows the wiring and the mounting position of a fuse in the case of using a voice coil by parallel connection. It is a figure which shows the connection relationship in the case of serial connection.

Explanation of symbols

20: Speaker, 30: Input impedance switching device (input impedance switching device), 32: Fuse (connection conductor), 36: Jumper wire (connection conductor), 42: Speaker side terminal row, 43: Amplifier side terminal row, 46: Mounting part row, 47: mounting part, 48: mounting part, 49: mounting part, 50: mounting part, 54: wiring, 70: cover plate, VC1: voice coil, VC2: voice coil, AMP1: audio amplifier, AMP2: Audio amplifier

Claims (5)

A plurality of speaker side terminals respectively connected to the respective terminals of the two voice coils of the speaker;
A plurality of amplifier side terminals to which each output line of the audio amplifier is connected according to the bi-amp connection, series connection and parallel connection of the voice coil,
A mounting part row in which each mounting part is detachable from a connection conductor, and all the terminals of all the mounting parts are positioned away from each other, and each mounting part is arranged in a line in the short direction of the connection conductor, and the voice The mounting part row terminal, the speaker side terminal, and the amplifier are switched so that the bi-amp connection, series connection, and parallel connection of the coils are switched by mounting one or more connection conductors to the mounting part corresponding to each connection. Wiring circuit connecting between side terminals,
A speaker input impedance switching device characterized by comprising:   The wiring circuit is a wiring circuit that achieves the bi-amp connection, the series connection, and the parallel connection of the voice coil by mounting two, one, and two connection conductors on the mounting portion row, respectively. In addition, when the voice coils are connected in series, another mounting portion is a wiring circuit in which the mounting connection conductor is maintained in a no-current state despite the mounting of the connection conductor thereto. The speaker input impedance switching device according to claim 1. The mounting part row consists of a total of four mounting parts,
The wiring circuit includes two other mounting portions except two mounting portions for mounting connection conductors for achieving the bi-amp connection and parallel connection of voice coils, and for achieving the series connection of voice coils. The two other mounting parts except for one mounting part for mounting the connection conductor on the other side and one mounting part for which the connection conductor is maintained in a non-current state even when the connection conductor is mounted are continuous 2 in the mounting part row. It is a wiring circuit that becomes a non-mounting row part as a single mounting part,
The speaker input impedance switching device according to claim 2, wherein a covering member is mounted so as to cover the non-mounting row portion.   In the case of the bi-amp connection of the voice coil, the wiring circuit has two mounting portions for mounting connection conductors as first and fourth mounting portions from one end side of the mounting portion row, and In the case of the parallel connection, the two attachment parts for attaching the connection conductors are the first and second attachment parts from one end of the attachment part row, and in the case of the series connection of the voice coils, the connection conductors And a mounting portion in which the connection conductor is maintained in a non-current state even when mounted, one and the other of the third and fourth mounting portions from one end side of the mounting portion row 4. The speaker input impedance switching device according to claim 2, wherein the speaker input impedance switching device is a wiring circuit.   5. The speaker input impedance switching device according to claim 1, wherein the connection conductor is a fuse or a jumper wire.

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