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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of a speaker system having a plurality of speakers mounted in a cabinet. [Prior Art]
As a conventional speaker system of this type, a plurality of speakers such as a woofer for bass
and a tow iter for high-pitched sound are attached to a panful port on the front of a cabinet, and
a single bass speaker as a woofer Was only used. Rarely, although two or more bass speakers
were used as woofers, both woofers were attached to the front baffle board. C. Problems to be
Solved by the Invention] In the speaker system as described above, the low frequency vibration
from the woofer causes the cabinet to resonate or vibrate, thereby inhibiting the reproduction of
the bass and reducing the output of the bass, thereby reducing the sound quality. There was a
drawback of deteriorating the In addition, in the case where a plurality of woofers are used, the
mounting thereof is a baffle board on the front surface, so the front area of the cabinet becomes
large and the size becomes large. SUMMARY OF THE INVENTION In order to solve the abovementioned problems of the conventional speaker system, the present invention vibrates the
woofers attached to the front and back of the cabinet in antiphase and with respect to the bottom
of the woofer on the front and back. The purpose is to make the vibration moment the same to
prevent cabinet resonance and vibration, and to prevent the reduction of the output level of the
bass region and the distortion in the bass region. [Summary of the Invention] In order to achieve
the above object, the present invention is characterized in that each woofer is attached to the
front and back surfaces of the cabinet, and the mounting height from the bottom of both woofers
and the discharge volume of the voice coil are equal. Do. BRIEF DESCRIPTION OF THE
DRAWINGS An embodiment of the invention will now be described with reference to the
drawings, in which: FIG. In FIG. 1, ■ is a cabinet constituting a speaker system, and a baffle port
2 on the front side is a woofer 3 for reproducing a low range from the bottom to a height LI from
the bottom and a mid range above it. A ditch speaker 4 for reproducing the high range is further
provided above the drange speaker 4. In addition, a puff full port 6 is provided on the rear
surface of the cabinet 1, and a woofer 7 for reproducing a bass range is attached to this at a
position of height L2 from the bottom surface. As shown in FIG. 2, low-pass filter 8 is connected
to these woofers 3 and 7 in order to feed only current in the low tone range, and only current in
the mid tone range is passed to the midrange speaker 4. The band pass filter 9 is connected.
Further, a bypass filter 10 for flowing only current in the high range is connected to the tow
filter 5, and an attenuator 11 for adjusting its output level is connected to the woofer 7.
When the woofer 7 on the rear surface is not attached to the cabinet 1, the cabinet 1 usually
vibrates at a frequency lower than the divided vibration frequency of the woofer 3, for example,
150 Hz or less due to resonance or the like. Since the vibration of the woofer 3 is applied to the
vibration of the cabinet 1, a reduction in the reproduction level in the low frequency range,
generation of distortion and the like occur. The reason why the cabinet 1 is picked up in this way
is that the current i flowing to the voice coil of the woofer 3 or 7 produces a force F in this voice
coil, and this force F is F = BAi = Bβ (□) B: magnetic flux density l: length of voice coil E: voltage
applied to voice coil Z: represented by impedance of voice coil. And although the current of the
same phase flows into the woofer 3 and 7, since the woofer 3 and 7 are reverse direction, a
vibration becomes an antiphase. Therefore, the vibrational moments of the woofers 3 and 7
applied to the buff full ports 2 and 6 are represented by F + L + and F2L2, and F + Lt = FzLt.
Therefore, equal vibrational moments in opposite directions are added to the cabinet 1 The
vibration of the cabinet 1 is damped because the vibrational moments act in the direction to
cancel each other. Further, as shown in FIG. 1, when the woofer 7 is positioned above the cabinet
1, the woofer 7 is separated from the floor, so that the floor is less affected during regeneration.
4 is a vibration acceleration diagram in the back and forth direction at point P in FIG. 3 when the
woofer 3 and 7 are attached with the dimensions of FIG. In the figure, A indicates that voltage is
applied only to the woofer 3 and no voltage is applied to the woofer 7, and the vibration
acceleration tends to increase as the frequency becomes higher, that is, by application of this
voltage The vibration acceleration corresponds to the conventional one without the woofer 7.
FIG. 7B shows that when the same voltage is applied to the woofer 3 and 7, the 20 dB vibration
acceleration is reduced at about 30 Hz, and the vibration of the cabinet 1 is attenuated. C in the
figure shows that the voltage of 570/730 of the voltage applied to the woofer 3 is applied to the
woofer 7, that is, when the above voltage ratio is set by the attenuator 11 and F + L + = F, L2, and
it is about 30 Hz or more The vibration acceleration is attenuated by about 20 dB in the entire
range of. Since the audio frequency is said to be about 50 Hz or more, the damping of the
vibration acceleration as shown in FIG. 4C is extremely effective in improving the reproduction
level in the low frequency range and preventing distortion.
[Effects of the Invention] Since the present invention can damp the cabinet resonance and
vibration represented by vibration acceleration as described above, the vibration of the woofer is
inhibited by the cabinet vibration and the reproduction level of the bass region is lowered. And
distortion in bass can be reduced. And, in order to obtain the same output level, one of the
woofers is attached to the back of the cabinet, so the area of the front baffle board can be
reduced, and therefore the cabinet can be miniaturized. . Moreover, since the woofer on the rear
face can be changed in place within the above-mentioned conditions, it is possible to select a
place with less influence of the wall and the floor. In addition, an attenuator is attached to the
woofer on the rear surface to obtain the best condition, and the output level of the bass, the
frequency characteristic of the bass range, and the like can be changed.
Brief description of the drawings
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a
circuit diagram, FIG. 3 is a mounting dimensional view, and FIG. 4 is a vibration acceleration
diagram in the front-rear direction of FIG.
レンジスピーカ、5・・・トウイタ、11・・・アッテネータ。 Figure 1 Figure 2 Morning
wave number (Hz) Figure 4
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