JPH11355879

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DESCRIPTION JPH11355879
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
composite equivalent coaxial speaker system in which bass speakers are disposed above and
below a high-pitched speaker.
[0002]
Conventionally, in this type of speaker, since the synthesized sound source of the bass speakers
arranged at the top and bottom overlaps the treble speaker arranged at the center, the sound
source positions coincide in all frequency regions from the bass area to the treble area, There is a
feature that good localization can be obtained.
[0003]
FIG. 2 is a side view showing an example of a conventional combined equivalent coaxial speaker
system.
It is a two-way speaker consisting of the bass speakers 1 and 2 and the treble speaker 3. By
keeping the trial listening point L on the general axis of the speaker system, it is shown that the
sound source is concentrated at the center of the speaker in all frequency bands.
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[0004]
Figure 2
[0005]
SUMMARY OF THE INVENTION As the combined equivalent coaxial speaker system uses a large
diameter bass speaker, the height increases, the speaker system becomes extremely large, and
the use restrictions increase.
Even in the case of the equivalent coaxial speaker system, if the upper and lower speakers are far
apart from each other, the clearness of the sound image may be disturbed due to the difference
in reflection path when installed indoors.
[0006]
In order to solve this problem, it is possible to use several small diameter bass speakers in place
of the large diameter bass speakers and to shorten the height. Therefore, when the listening
point is shifted to the left and right, the sound source moves in the shifted direction, which
causes a problem that localization is unstable, which is not practical.
[0007]
It is an object of the present invention to provide a composite equivalent coaxial speaker system
that has a sufficient radiation area necessary for bass reproduction, but does not excessively
increase the vertical dimension of the speaker unit arrangement portion in the speaker system,
and makes it wider and stable. It is in providing a speaker system which secures a listening area
and has good acoustic performance.
[0008]
[Means for Solving the Problems] In order to solve the above-mentioned problems, instead of two
conventional large-diameter bass speakers, four relatively small-diameter bass speakers are used,
and two are grouped as a group. Arranged above and below the high-pitched speakers, the two
speakers included in each group are arranged horizontally, and the speakers face inward at an
opening angle α, and α is between 150 ° and 110 ° It is characterized by
[0009]
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BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in more detail with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a composite equivalent coaxial speaker
system according to the present invention.
The same reference numerals are given to parts that perform the same functions as those of the
above-described conventional example, and redundant description will be omitted as appropriate.
[0010]
Figure 1
[0011]
In this embodiment, 1A, 1B, 2A, 2B are bass speakers, and 3 is a treble speaker.
1A and 1B are arranged as a group on 3 and 2A and 2B as a group are arranged below 3 to be
equivalent coaxial.
Furthermore, 1A, 1B, and 2A, 2B are respectively arranged horizontally, and are facing inward at
an opening angle α. The four bass speakers 1A, 1B, 2A, 2B are wired so that the same signal can
be applied. The opening angle α is set between 150 degrees and 110 degrees. This angle is
determined in consideration of the speaker aperture, the use band, the setting of the listening
area, and the like.
[0012]
In general, the speaker has the highest sound pressure on the axis and a directional feature that
decreases around it. In the two horizontally arranged speakers as shown in FIG. 3, when the
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listening point moves to N horizontally with reference to two on the central axis M, the speaker A
on the moved side becomes closer and the pointing Due to sexual effects, sound pressure is
increased. The distant speaker B has a large distance and also has an influence of directivity, and
the sound pressure is reduced. Therefore, as the listening point moves from M to N, the
combined sound source of the two speakers also moves from m to n.
[0013]
Figure 3
[0014]
On the other hand, as shown in FIG. 4, when the two speakers face each other at the opening
angle α, the sound pressure of the moved speaker A is equal to the distance when the listening
point moves from M on the synthetic axis to N. While it rises as it approaches, it attenuates by
directivity.
The sound pressure of the other speaker B attenuates as the distance increases, but the
directivity rises as it goes on axis. By appropriately selecting the opening angle α, it is possible
to mutually compensate the change in sound pressure due to the distance and the directivity and
eliminate the movement of the sound source. This state is equivalent to one speaker at the
center.
[0015]
Figure 4
[0016]
After arranging horizontally in this manner, two bass speakers facing inward at an appropriate
angle α are grouped, and a pair of loudspeakers are arranged so as to be sandwiched up and
down.
As described above, the bass loudspeakers arranged above and below operate such that there is
one loudspeaker at the center of each. Furthermore, when these are synthesized at the top and
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bottom, the synthesized sound source coincides with the treble speaker position and does not
move regardless of the listening position, so that good localization can be obtained.
[0017]
In the embodiment of FIG. 1, the outside of the bass speaker mounting surface is folded at an
angle of β. Furthermore, it is folded back at 90 degrees to make a side wall. In this
configuration, as compared with the case where the outer surface of the mounting surface of the
bass speaker is flat, the acoustic resonance phenomenon caused by the depression of the bass
speaker mounting portion is alleviated and is further generated at the corner portion of the
cabinet. Diffraction phenomena can also be reduced, and better performance can be obtained.
The opposing surfaces inside the cabinet are also reduced, which also helps to suppress internal
standing waves. The appropriate value of β is 7.5 degrees to 17.5 degrees.
[0018]
Furthermore, in the embodiment of FIG. 1, the entire baffle is W-shaped except for the high-tone
speaker attachment surface, and the upper and lower parts of the attachment portion for the lowtone speaker are open. By configuring in this way, it is possible to avoid the acoustic resonance
phenomenon due to the V-shaped recess of the mounting portion of the bass speaker, and to
obtain more straightforward characteristics and good sound quality. Can do.
[0019]
According to the present invention, among the sounds emitted from the treble speaker, the sound
directed toward the rear and reflected by the bass speaker mounting surface is also reflected by
the W-shaped baffle as compared with the reflection by the conventional flat surface. Is a
randomness, so there is little interference with direct sound, and an improvement effect will be
produced for the high tone range.
[0020]
In the present invention, the four bass speakers have the same performance, and basically the
same signal is added to each of them. However, the low-pass characteristics of the four speakers
may be slightly different or the used band It is needless to say that they are included in the
present invention as long as the effects of the present invention can be obtained even if they are
different.
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