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JPS59185499

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DESCRIPTION JPS59185499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system used in all audio fields such as high-7 eye reproducing devices and speakers for
electronic musical instruments. The configuration of the prior art and its problems An example of
a conventional loudspeaker system is shown in FIG. In the figure, 1 is a speaker enclosure, 2 is a
bass speaker, 3 is a low pass filter, 4 is a treble speaker, 5 is a high-pass filter, and 6 is an input
terminal. An example of the sound pressure response curve to the frequency by such a
configuration is shown in FIG. In the figure, A indicates the response curve in the optimum
design state, and B indicates that the force coefficient (effective magnetic flux density × length
of the voice coil in the magnetic gap) of the low frequency speaker 2 is increased to increase
conversion efficiency. C is the response curve when the force factor is decreased. As can be seen
from these response curves A-C, when the power factor is increased for the purpose of increasing
the conversion efficiency, the level / l / of the middle to high tone frequency rises but conversely
the lowest frequency f. In the near term, the overpressure is reduced and the sound pressure
decreases, and conversely, if the force coefficient is reduced, the level of the middle and high
frequency decreases and the lowest frequency f. Sound pressure in the vicinity rises. Thus,
according to the conventional configuration, the lowest resonance frequency f. The conversion
efficiency of the low frequency near and the conversion efficiency near the middle to high
frequency have the disadvantage of being compatible with fixing the speaker enclosure 1.
OBJECTS OF THE INVENTION It is an object of the present invention to provide a loudspeaker
system excellent in both low-frequency conversion efficiency and mid-high frequency conversion
efficiency. The speaker system of the present invention connects two or more speakers having
substantially the same lowest resonance frequency in parallel, and the input impedance at the
lowest resonance frequency of one speaker of the other speakers is the other The electric
impedance of the speaker is significantly smaller than that of the speaker, and the electric
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1
impedance of the speaker is higher than that of the other speakers. From this K, it is possible to
obtain a speaker system that is excellent in both low-frequency conversion efficiency and midhigh frequency conversion efficiency. Description of the Embodiments One embodiment of the
present invention will be described with reference to FIGS. 3 and 4. FIG. In FIG. 3, 11 is a speaker
enclosure, S is a bass speaker, 13 is a low bass loudspeaker, T is another bass speaker, and the
two speakers S and T are connected in parallel. In this case, the speaker S has a feature like that
of the speaker T.
(Al is almost the same lowest resonance frequency f. Have. (Bl minimum resonance frequency f.
Low input impedance at (C1 electrical impedance is high. 14 is a high-pitched speaker, 15 is a
bypass filter, and 16 is an input terminal. According to this configuration, the lowest resonant
frequency f. The input impedance of the speaker S in is the effective voice coil wire length). The
lowest resonant frequency f of the speaker T. The input impedance at is From the conditions,
input impedance Z. 8<z。 T 'electrical impedance R) R also mechanical loss RMs + RM0,
minimum resonance frequency f as using vibration parts of the same ES KTll. At low frequencies
in the vicinity, drive with a constant voltage amplifier and Z. S <Z. By the power of the system, the
power of the resonance frequency f is applied to the lowest resonance frequency f. At higher
frequencies, '-RES> RF, T, a larger power to the electro-mechanical coupling factor, i.e. an
essentially high conversion efficiency of the loudspeaker (speaker T), is applied. The condition is
shown in the sound pressure response curve of FIG. 4, where Ls is the sound pressure response
curve of the speaker S, L is the sound pressure response curve of the speaker T, and LST is the
both speakers S and T. Sound pressure response curve. Thus, both speakers S and T can provide
a speaker system excellent in both low-frequency conversion efficiency and mid-high frequency
conversion efficiency. According to the speaker system of the present invention, the effect of
being excellent in both the conversion efficiency of low frequency band and the conversion
efficiency of medium to high frequency band can be obtained.
[0002]
Brief description of the drawings
[0003]
1 (al is a front view of a conventional example, FIG. 1 (bl is a sectional view thereof, FIG. 2 is a
characteristic characteristic diagram of frequency and sound pressure of the conventional
example, FIG. 3 (al is an embodiment of the present invention FIG. 3 is a front view of FIG. 3 (bl is
a cross-sectional view thereof, and FIG. 4 is a characteristic characteristic diagram of frequency
and sound pressure in this embodiment.
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2
S, T: Sukika (a) (b) Fig. 1 Fig. 2 (a) (b) Fig. 3 Fig. 4 573-
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3
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