JPH05328474A - Method for installing bass reproducing loudspeaker system - Google Patents

Abstract

PURPOSE:To install a bass reproducing loudspeaker system for efficiently radiating output sound pressure from a passive sound radiating means for taking charge of reproduction of the lowest compass. CONSTITUTION:At the time of executing bass reproduction by installing a loudspeaker system provided with a loudspeaker unit 1 for executing directly an acoustic radiation to the outside and an acoustic port 3a being a passive sound radiating means, in a listening room 10 such as a listening room of a house in general, the acoustic port 3a is opened toward the inside of the listening room 10, and also, the loudspeaker unit 1 is provided toward the outside of the listening room 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a bass reproduction speaker system for expanding a reproduction frequency band in a bass range.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a general bass reflex type speaker system. In the figure, 1 is a speaker unit, 2 is a cabinet in which the speaker unit 1 is installed, 3a is an acoustic port which is a passive acoustic radiation means provided in a part of the cabinet 2, and 4a is an air chamber inside the cabinet 2. . FIG. 4 shows an example of output sound pressure frequency characteristics of the bass reflex type speaker system.
The characteristic A is the output sound pressure frequency characteristic of the speaker unit 1, the characteristic B is the output sound pressure frequency characteristic of the acoustic port 3a, and the characteristic C is the total sound pressure characteristic obtained by combining the characteristic A and the characteristic B.

A general bass reflex type speaker system is constructed as described above, and when the speaker unit 1 is driven, the characteristic B generated by the resonance of the compliance component in the air chamber 4a and the mass component of the acoustic port 3a.
And the characteristic A generated from the speaker unit 1 at this time were combined to obtain the characteristic C.

FIG. 5 shows, for example, Japanese Unexamined Patent Publication No. 60-9879.
It is sectional drawing which shows the conventional speaker system with an acoustic port disclosed by the 3rd publication. In the figure, 5 is a partition plate for blocking the interior of the cabinet 2 and providing the speaker unit 1, 4b is a first air chamber which is a cavity in front of the speaker unit 1, and 4c is a second air chamber which is a cavity in the rear of the speaker unit 1. Reference numeral 3b denotes a first acoustic port which is a passive acoustic radiation means for opening the first air chamber 4b to the external space, and 3c denotes a second passive acoustic radiation means for opening the second air chamber 4c to the external space. It is an acoustic port. Since the other components are the same as those in FIG. 3, the description is omitted. FIG. 6 is an output sound pressure frequency characteristic of a conventional speaker system with an acoustic port. In the figure, characteristic D is an output sound pressure frequency characteristic of the first acoustic port 3b, and characteristic E is an output sound pressure of the second acoustic port 3c. The pressure frequency characteristic and the characteristic F are total sound pressure characteristics obtained by combining the characteristic D and the characteristic E.

The conventional speaker system with an acoustic port is configured as described above, and by driving the speaker unit 1, the compliance component inside the first air chamber 4b and the mass component of the first acoustic port 3b are separated. The characteristic D, which is caused by resonance, and the characteristic E, which is generated by resonance of the compliance component inside the second air chamber 4c and the mass component of the second acoustic port 3c, are combined to obtain the characteristic F.

[0006]

Since the general bass reflex type speaker system as described above is constructed as described above, when the speaker system is installed in the listening room to reproduce in the low frequency range, the In the band below the resonance frequency of the port, the sound pressure output from the speaker unit is in opposite phase to that of the sound port output sound pressure and cancels each other out, and the low range reproduction limit frequency of the total sound pressure characteristics is lower than that of the sound port output sound pressure. However, there was a problem that the bass reproduction was inefficient.

Further, in the conventional speaker system with an acoustic port, the second acoustic port output sound pressure has a phase opposite to that of the first acoustic port output sound pressure in a band below the resonance frequency of the first acoustic port. There was a problem that the low frequency reproduction limit frequency of the total sound pressure characteristic became higher than that of the sound pressure output from the first acoustic port, and the low frequency reproduction was inefficient.

The present invention has been made in order to solve the above problems, and is a method of installing a speaker system for low-pitched sound reproduction that efficiently radiates the output sound pressure from the passive acoustic radiating means that is responsible for the reproduction of the lowest sound range. Aim to get.

[0009]

A method of installing a speaker system for bass reproduction according to the present invention relates to a speaker system provided with a speaker unit for directly radiating sound to the outside and a passive sound radiating means. The acoustic radiation surface is provided toward the inside of the listening room, and the speaker unit opening is provided toward the outside of the listening room.

Further, regarding a speaker system provided with a speaker unit provided inside the cabinet and a plurality of passive acoustic radiation means having different resonance frequencies, only a part of the acoustic radiation surface of the passive acoustic radiation means is placed inside the listening room. The acoustic radiation surface of the remaining passive acoustic radiation means is provided toward the outside of the listening room.

[0011]

In the method for installing the speaker system for low-frequency sound reproduction according to the present invention, the acoustic emission surface of the passive acoustic emission means is provided toward the inside of the listening room, and the speaker unit opening is provided toward the outside of the listening room. The anti-phase component of the output sound pressure emitted from the unit does not cancel the output sound pressure of the passive acoustic emission means that is responsible for the reproduction of the lowest sound range, and efficient bass reproduction can be performed.

Further, by providing the acoustic radiation surface of the passive acoustic radiation means, which is responsible for the reproduction of the lowest sound range among the plurality of passive acoustic radiation means, inside the listening room, and the acoustic radiation surfaces of the remaining passive acoustic radiation means outside the listening room. , The anti-phase component of the output sound pressure emitted from the remaining passive acoustic emission means does not cancel the output sound pressure of the passive acoustic emission means responsible for the reproduction of the lowest sound range, and efficient bass reproduction can be performed. .

[0013]

EXAMPLES Example 1. 1 is a cross-sectional view of a speaker system for bass reproduction and an installation environment showing Embodiment 1 of the present invention.
In the figure, 10 is a listening room such as a listening room of a general house, and 3 a is an acoustic port opened toward the inside of the listening room 10. Since the other components are the same as those of the general bass reflex type speaker system shown in FIG. 3, description thereof will be omitted.

In the method of installing the bass reproduction speaker system of the first embodiment configured as described above, only the acoustic port 3a opening of the bass reflex type speaker system is provided toward the inside of the listening room 10 and the speaker unit 1 is provided.
Since the opening of is directed toward the outside of the listening room 10, the opposite phase component of the output sound pressure emitted from the speaker unit 1 does not cancel the output sound pressure of the acoustic port 3a responsible for the reproduction of the lowest range, Only the characteristic B shown in FIG. 4 can be reproduced.

Example 2. Second Embodiment FIG. 2 is a cross-sectional view of a speaker system for bass reproduction and an installation environment showing a second embodiment of the present invention. In the drawing, 10 is a listening room, and 3b is a first acoustic port opened toward the inside of the listening room 10. The other components are the same as those of the conventional speaker system with an acoustic port shown in FIG.

In the method of installing the low-pitched sound reproducing speaker system of the second embodiment configured as described above, the listening room 10 is provided with only the opening portion of the first acoustic port 3b responsible for the reproduction of the lowest range in the speaker system with the acoustic port. Since the opening of the second acoustic port 3c is provided to the inside and the opening of the second acoustic port 3c is provided to the outside of the listening room 10, the antiphase component of the output sound pressure radiated from the second acoustic port 3c is the same as that of the acoustic port 3b. Only the characteristic D shown in FIG. 6 can be reproduced without canceling the output sound pressure.

Further, in the first and second embodiments of the present invention, the listening room having the acoustic port for reproducing the lowest range is described as a listening room of a general house. However, the listening room is, for example, a passenger compartment of an automobile. It goes without saying that the same effect can be obtained, but in this case, if the sound pressure component radiated toward the outside of the listening room is radiated into the interior of the car's trunk room, there will be no sound leakage to the surroundings, Don't bother you.

[0018]

As described above, according to the present invention, when a speaker system having a speaker unit for directly radiating sound to the outside and a passive sound radiating means is installed, the acoustic radiating surface of the passive sound radiating means is set. Since the speaker unit opening is provided to the outside of the listening room and the speaker unit opening is provided to the outside of the listening room, the output sound of the passive acoustic radiating means that the antiphase component of the output sound pressure emitted from the speaker unit is responsible for the reproduction of the lowest range. Efficient bass reproduction can be performed without canceling the pressure.

Further, when installing a speaker system including a speaker unit provided inside the cabinet and a plurality of passive sound radiating means having different resonance frequencies, the passive sound radiating means is responsible for reproduction of the lowest range. Since the acoustic radiation surface of the acoustic radiation means is provided toward the inside of the listening room and the acoustic radiation surface of the remaining passive acoustic radiation means is provided toward the outside of the listening room, the output sound radiated from the remaining passive acoustic radiation means. Efficient bass reproduction can be performed without canceling the output sound pressure of the passive acoustic radiation means in which the antiphase component of the pressure is responsible for reproduction in the lowest range.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an installation method of a bass reproduction speaker system according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a method of installing the bass reproduction speaker system according to the second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a bass reflex type speaker system.

4 is an output sound pressure frequency characteristic diagram of the bass reflex type speaker system of FIG. 3;

FIG. 5 is a cross-sectional view showing a conventional speaker system with an acoustic port.

FIG. 6 is an output sound pressure frequency characteristic diagram of the speaker system with the acoustic port of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speaker unit 2 Cabinet 3a Sound port (passive sound radiation means) 3b First sound port (passive sound radiation means) 3c Second sound port (passive sound radiation means) 4a Air chamber 4b First air chamber 4c Second Air room 5 Partition board 10 Listening room

Claims (2)

[Claims] 1. A speaker system comprising: a speaker unit that directly emits sound to an external space; and a passive sound emitting means that acoustically resonates when the speaker unit is driven. Is provided toward the inside of the listening room and the speaker unit opening is provided toward the outside of the listening room. 2. A speaker system comprising a speaker unit provided inside a cabinet and a plurality of passive acoustic radiation means which acoustically resonate with the driving of the speaker unit, wherein a part of the passive acoustic radiation means is provided. The method for installing a speaker system for low-pitched sound reproduction is characterized in that only the sound emitting surface of the above is provided toward the inside of the listening room, and the sound emitting surface of the remaining passive sound emitting means is provided toward the outside of the listening room.