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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing the
main part of a conventional two-way speaker device of a flat array type, and FIG. 2 is a
characteristic diagram showing the state of intermodulation distortion in the conventional □.
FIG. 3 is a partial cross-sectional view showing the main part of the speaker device □ of the
present invention configuration. In the figure, 1 is a high-tone speaker, 2 is a bass speaker, 3 is a
diaphragm, and 4 is a speaker cabinet. 5 shows a sound absorbing layer.
[Detailed description of the invention] In the present speaker apparatus, what is the mainstream
of the speaker arrangement type, so-called planar array type, this is a single baffle plate
juxtaposed speakers for bass and treble Devices (two-way speaker device) and those in which
speakers for low, medium, and high tones are similarly juxtaposed (three-way speaker device) ·
Figure 1 shows this two-way speaker device, this method , The band of the input signal is divided
into two, and the bass f and the speaker f21. (In addition to the provision of 11, and by disposing
both of these speakers apart, the sound emitted from the high-tone speaker fi + is shown by the
dotted and dashed lines in FIG. It reflects on the diaphragm (3) to prevent cross modulation
distortion caused thereby. However, even with the adoption of such a scheme, prevention of
intermodulation distortion is still not sufficient, and the measured value of this intermodulation
distortion is shown, for example, in FIG. That is, specifically, it can be seen that the
intermodulation distortion of a value lower by 406 than the original signal occurs at a frequency
of 3.000. ± .70 & when the frequency of high tone is 3.000 & and the frequency of bass is 70 &.
In general, musical instrument sounds often contain harmonics, so even if harmonic distortion is
generated by this type of speaker, it is relatively difficult to detect by hearing, and therefore the
degree of sound quality deterioration due to this is also relatively minor. Since the abovementioned intermodulation distortion is a sound which is not originally mounted on the
instrument sound which is the original signal, the degree of loss of the sense of hearing and the
sound quality is large and there is a serious interest (2) in its elimination. As shown in FIG. 3, the
present invention is devised to eliminate the above-mentioned conventional defects, and as
shown in FIG. 3, on the surface of the diaphragm (3) of the bass speaker (2), By sticking and
adding a sound absorbing layer (5) made of a material having a large sound absorbing coefficient
with a small sound absorbing coefficient on the contrary, it is a measure to reduce the
intermodulation distortion as described above. High pitch speaker (1 Since the sound wave
emitted from the sound enters the diaphragm (3) of the bass speaker (2) and reflects it, it passes
through the above-mentioned sound absorbing layer (5) added on the diaphragm (3). Although
this sound absorbing layer (5) is made of, for example, a fibrous or porous sound absorbing
material (soft foamed polyurethane), these sound absorbing materials usually have a sound
absorbing coefficient of 80 to 90 in a frequency of LOOOO or higher. Many, consequently, the
above-mentioned intermodulation distortion sound is absorbed by this sound absorption layer
(5), and a reduction of, for example, 6 to 10 a can be achieved. Note that the general sound
absorption material has a very high sound absorption coefficient of bass. (3) The size is usually
small, so the energy released from the bass speaker (2) is hardly affected by the addition of the
sound absorbing layer (5).
Further, since the above-mentioned sound absorbing material itself is light in weight and soft in
many cases, the weight of the diaphragm (3) of the bass speaker (2) is extremely increased by the
addition of the sound absorbing layer (5). Furthermore, there is no inconvenience such as
reduction of acoustic radiation. 0 In the case of other proposed configurations, the abovementioned harmonic distortion sound belonging to the high sound area generated from the
diaphragm (3) of the bass speaker (2) is also on the surface Since it is absorbed by the sound
absorbing layer (5), it has many advantages such that the harmonic distortion of the bass speaker
itself can be reduced thereby.
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