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DESCRIPTION JPH05103389

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DESCRIPTION JPH05103389
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device, and more particularly to the improvement of the sound quality of the midrange.
[0002]
2. Description of the Related Art FIG. 2 is a longitudinal side view showing a conventional
speaker device. In the figure, (1) is a cabinet, and the inside is divided into a first air chamber (2),
a second air chamber (3) and a third air chamber (4). (5)And a speaker for bass stored in the
second air chamber (3), in which walls dividing the first and second air chambers (2) and (3) are
attached as baffle plates (6). (7)Is a port communicating with the first air chamber (2) and the
outside, and (8) is a middle to high-tone speaker mounted so that the third air chamber (4) is at
the rear.
[0003]
The conventional speaker device is configured as described above, and the sound heard by a
person emits the sound emitted by the bass speaker (5) to the external sound field from the port
(7) through the first air chamber (2) The low-pitched range and the mid-high range released
directly to the external sound field from the mid-high range speaker (8) become a combined
sound.
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[0004]
In this case, the bass range is high in the passive type by radiating the sound from the bass
speaker (5) through the first air chamber (2) to the external sound field through the port (7). It is
possible to construct a low pass filter acoustically by the resonance action of the port (7) and the
first air chamber (2) without configuring the next electric filter or the like.
[0005]
SUMMARY OF THE INVENTION In the conventional speaker apparatus as described above, the
sound from the bass speaker (5) is emitted from the port (7) through the first air chamber (2), A
peak of resonance is generated in the middle and high frequency range by the port (7), and it is
necessary to form a network circuit to remove this peak, resulting in a problem of high cost.
[0006]
The present invention has been made to solve the above-mentioned problems, and to provide a
speaker device capable of obtaining the characteristics of a high-performance low-pass filter
having no resonance peak in the middle to high range with an inexpensive configuration. To aim.
[0007]
A speaker device according to the present invention is a push-pull device in which walls for
dividing the first and second air chambers are baffle plates and two bass speakers are mounted
facing each other. In operation, a port communicating the second and fourth air chambers is
formed outside the third air chamber.
[0008]
In the present invention, since the two bass speakers are mounted on the baffle plate so as to
face each other for push-pull operation, the input load is divided into two.
In addition, since the port for communicating the second and fourth air chambers is formed
outside the third air chamber, the acoustic resonator can be made compact.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a side view in vertical
section showing an embodiment of the present invention, in which parts similar to those of the
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conventional apparatus are designated by the same reference numerals.
[0010]
In the figure, (5) is a bass speaker housed in the first and second air chambers (2) and (3) and
mounted on the baffle plate (6) so as to face each other, and (11) is the third air. The fourth air
chamber (12) disposed above the chamber (4), (12) is provided behind the third air chamber (4),
and the fourth air chamber (11) and the second air chamber (3) Port to communicate with each
other.
[0011]
In the speaker device configured as described above, an acoustic resonator is configured by the
port (12) and the fourth air chamber (11).
Then, by determining the three values of the inner diameter and the length of the port (12) and
the internal volume of the fourth air chamber (11), it is possible to arbitrarily set the frequency
to be absorbed.
Therefore, it is possible to obtain high-performance low-pass filter characteristics by matching
the resonance frequency to the mid-range peak frequency causing sound quality and
performance degradation.
[0012]
In addition, since the port (12) is formed utilizing the space behind the third air chamber (4) and
the cabinet (1), the resonator can be made compact.
[0013]
Furthermore, by placing the low frequency speakers (5) and (5) opposite to each other and
performing push-pull operation, the input resistance is doubled, and the aperture of the speaker
is smaller than in the case where one speaker is operated. It is possible to
[0014]
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As described above, in the present invention, the walls for dividing the first and second air
chambers are used as baffle plates so that two bass speakers are mounted facing each other for
push-pull operation. Thus, the input resistance can be improved, and the aperture of the bass
speaker can be reduced.
In addition, since a port communicating the second and fourth air chambers is formed outside
the third air chamber, an acoustic resonator is formed, and by setting its resonance frequency, a
high-performance low-pass filter is formed. There is an effect that the speaker device having the
characteristics can be configured compactly.
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