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JPS609295

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DESCRIPTION JPS609295
[0001]
The present invention relates to the improvement of a speaker system for bass reproduction. As
shown in FIG. 1, the low-pitched sound cone type loudspeaker unit has a sound H-frequency
characteristic that peaks at the high-pitch resonance frequency fH. In order to remove such a
peak, a method of removing a peak by a high cut filter and a method of absorbing a peak by a
sound absorption net are conventionally known. However, in both cases the effect is not
sufficient, and the former has the drawback that the transient characteristic is deteriorated if the
high-pass attenuation characteristic of the high cut filter is steep (-18-m-24 dB 10 ct) O Is an
improvement of such a conventional defect, and an embodiment of FIGS. 2 and 3 will be
described below. In the figure, (1) is a cabinet, (2) is a cone-type speaker unit for bass
reproduction equipped with a cone paper (3), and (4) is a bulky sock horn having a square throat
portion (5), The length of the-side of the throat portion (5) is smaller than the outer diameter of
the cone paper (3), and as shown in the drawing, a part of the outer periphery of the cone paper
(3) is the inner periphery of the horn (4) Covered by (6) is a square pyramidal equalizer provided
with a spherical opposing portion at the bottom opposite to the central dome portion (dust cap)
of the cone paper (3), and is disposed at the center of the throat portion (5) of the horn (4) Then,
the frequency at which the dip occurs in the high region of the gain characteristic of the horn (4)
including the equalizer (6) is matched to the number t of high-tone resonance layers U of the
speaker unit (2). That is, the horn (4) is set so that the average path length from the central
portion and the outer peripheral portion of the cone sheet (3) of the speaker unison (2) to the
throat portion (5) is 172 of the wavelength of the high sound resonance frequency f H The
dimensions of the equalizer (6) etc. are properly determined. According to the above
configuration, in the throat portion (5) of the horn (4), the sound wave from the portion facing
the throat portion (5) of the cone paper (3) and the central portion and the outer peripheral
portion of the cone paper (3) The gain characteristics of the horn (4) including the equalizer (6)
02-05-2019
1
are shown in FIG. 4 because the phases of the sound waves of the sound wave are in antiphase at
the high sound resonance frequency fH of the speaker unit (2) and the rain sound waves cancel
each other. As shown in FIG. 5, a large dip occurs at the high frequency resonance frequency fH
of the speaker unit (2). However, the sound pressure frequency characteristic of the speaker
system is a combination of the gain characteristic of the horn (4) including the equalizer (6) and
the sound pressure frequency characteristic of the speaker unit (2). As shown in FIG. 5, in the
diagram (0) where the peak at the high sound resonance frequency fH is removed, d represents
the characteristics of the speaker system without the horn and the equalizer.
In addition, in the present invention, the frequency at which the dip occurs in the high region of
the gain characteristic of the horn (4) including the equalizer (6) is made to coincide with the
high sound resonance frequency fH of the speaker unit (2). Since the peak at the high frequency
resonance frequency f H of (2) is canceled and removed, the types and shapes of the horn and
the equalizer are not limited to the above embodiment, but various types and shapes, For
example, it can be realized by an exponential horn, a conical equalizer or the like. As described
above, according to the present invention, the equalizer (6) is disposed in the throat portion (5) in
the structure in which the bass reproduction speaker unit (2) is disposed to face the throat
portion (5) of the horn (4). And the frequency causing the dip in the high region of the gain
characteristic of the horn (4) including the equalizer (6) is made to coincide with the high-tone
resonance frequency fH of the speaker unit (2). It has the advantage of being able to effectively
eliminate the peak at the high frequency resonance frequency fs.
[0002]
Brief description of the drawings
[0003]
1 shows the sound pressure frequency characteristics of the speaker unit, FIG. 2 and FIG. 3 show
the structure of the speaker system for bass reproduction according to the present invention, and
FIG. 4 shows the sound pressure frequency characteristics. .
(2) u speaker unit, (4) horn, (5) throat part, (6) equalizer 0 patent applicant Onkyo Co., Ltd.
Attorney Attorney Attorney Satoshi Satoshi Part 1 Fig. 3 Fourth
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