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・ Description / name of invention
Speaker device
The present invention relates to a speaker device. Generally, in the speaker device, a closed-type
or bass reflex type was used for the speaker beaker cabinet to correct or emphasize the low
range. However, in such cabinets, the bass has caused a change in timbre. This change in timbre
occurs for two reasons. The first reason is bandwidth. That is, the tone of the box is doubled
around the natural resonance point of the speaker cabinet, and the speaker characteristics are
surpassed by being synergistic with the standing wave, the diffracted wave and the reflected
wave. The second reason is the internal sound pressure difference of the cabinet. That is, the
smaller the capacity of the cabinet, the more pressure there is pressure to brake the cone
movement of the speaker at the rise of the answer, and the pressure to keep the movement
continuing at the fall of the sound, so it is transparent in the bass range It was a huge sound that
was lacking. The present invention suppresses the resonance point of the speaker cabinet,
absorbs the standing wave 1, the diffracted wave and the reflected wave, and at the same time
reduces the internal sound pressure difference, thereby preventing the change of the timbre
generated in the low frequency range. It aims at providing an apparatus. Hereinafter, the present
invention will be described based on an embodiment shown in FIG. 1 and FIG. Reference numeral
l denotes a speaker cabinet made of 21 mm thick Rain plywood and having an inner volume of
56 g. Inside the cabinet 1, a sound absorbing material such as glass wool is attached except for a
rear EndPage: 1 plate. 3 is a woofer speaker, which is a cone speaker of 30 cm in diameter. 5 is a
control woofer speaker, which is a cone speaker of 16 cm in diameter. 7は1・−ムソイクース
ピーカー、9はコーンソイクースピーカーである。 Fig. 2 shows the electrical connection of
these speakers. The speaker speaker 7.9 has its positive side connected to the positive side
speaker input terminal 13 via a capacitor 11 and its negative side connected directly to the single
side speaker input terminal 15. The woofer speaker 3 is connected to its plus side and minus
side, or to the 4-side 13 of the speaker input end r, -1llllll15. The negative side of the control
woofer speaker 5 is connected to the +1 rule output terminal of the LC · · · ノ node circuit 17, and
the + side is connected to one side output terminal of the r, c · · · ノ circuit. The + side input
terminal and the 1 side input terminal of this LC, · · · node circuit 17 are connected to a speaker
input terminal 13.1.
In this speaker device, since the control woofer speaker 5 is provided, acoustic negative feedback
is applied, and the resonance point of the chain is acoustically suppressed, and the standing
wave, the diffraction plate, or the reflected wave is absorbed, and at the same time the internal
sound The pressure difference is getting smaller. Therefore, it was possible to prevent the tone
change, and the following audition result was obtained. In male voices, the reverberation is
absorbed, and in stereo, the voices do not spread from side to side, so the sense of localization is
good5, and in chorus, the position of each part is easy to understand. There is no feeling that the
sound tends to be overshadowed in the high-pitched part because the bass part is not blurred, so
it is clear that it is clear 1 and the playing area is wide in the large organization such as ン n フ
オ ー. The sound of the drums and bass is not huge, so the transition is good. It is difficult to
soften the sound even if the bass control of the amplifier is maximum (+ '7.5 dB). In the above
embodiment, the woofer speaker 3 has a diameter of 30-, and the control speaker No. 5 has a
diameter of 16 cm, but the cone area ratio of the control woofer speaker 5 to the woofer speaker
3 Is it / 3? What is necessary is to be in the range
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a speaker device
according to the present invention, and FIG. 2 is a circuit diagram of the same. l ... speaker
cabinet, 3 ... woofer speaker, 5 ... control woofer speaker 13.15 ... speaker input terminal. Patent
applicant Shigeru Kobayashi Akira Shimizu et al. 2 others EndPage: 2
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