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JPS6146697

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DESCRIPTION JPS6146697
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker system using two bass
speaker units. The method of using two large-diameter bass units having the same performance
to increase the sound pressure in the low frequency region and the configuration of the
conventional example is often used, but the parallel connection method shown in FIG. 1 is used
as the connection method. The series connection method shown in FIG. 2 is often used. When
using these conventional methods, parallel connection may cause problems with the combined
amplifier because the combined impedance is lowered. In addition, since the speaker units are
connected to the amplifier via the other speaker units in the series connection, the braking state
is deteriorated at the lowest resonance frequency. 1 and 2, 1.2 is an input terminal, 7 is a first
bass speaker unit, 8 is a second bass speaker unit, 9 is a cabinet, and 1o is an amplifier. The
object of the present invention is to solve the above-mentioned conventional drawbacks, and it is
an object of the present invention to increase the speaker driving power at the lowest resonance
frequency and to increase the sound pressure of the bass without causing any problem with the
amplifier. I assume. SUMMARY OF THE INVENTION In order to achieve the above object, the
speaker system of the present invention comprises two bass speaker units having the same
performance, a parallel resonance circuit composed of an inductor L1 and a capacitor C1, a
series resonance circuit, and a cabinet. However, the resonant frequency of the above-mentioned
resonant circuit matches the lowest resonant frequency when the above-mentioned speaker unit
is stored in the above-mentioned cabinet. Description of Embodiments Hereinafter, an
embodiment of the present invention will be described based on the drawings. FIG. 3 is a block
diagram of the speaker system according to the present invention, and FIGS. 4a and 4b are sound
pressure frequency characteristics of the conventional speaker system shown in FIG. Sound
pressure frequency characteristics of the conventional speaker system shown in FIG. 2,
impedance characteristics seen from the input terminal, e. f is the sound pressure frequency
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characteristic of the speaker system according to the present invention shown in FIG. 3 and the
impedance characteristic viewed from the input terminal. In FIG. 3, the input terminal 1 is
connected to the plus terminal 3 of the bass speaker unit 7, and the input terminal 2 is connected
to the minus terminal 6 of the bass speaker unit 8. Further, a parallel resonant circuit composed
of an inductor L1 and a capacitor C1 is connected between the negative terminal 4 of the low
frequency speaker unit 7 and the positive terminal 6 of the low frequency speaker unit 8.
Furthermore, a series resonant circuit composed of an inductor L1 and a capacitor C1 is
connected between the input terminal 1 and the plus terminal 6 of the bass speaker unit 8 and
between the input terminal 2 and the minus terminal 4 of the bass speaker unit 7 There is. The
resonance frequencies of the parallel resonance circuit and the series resonance circuit are made
to coincide with the lowest resonance frequency when the bass speaker unit is stored in the
cabinet. In the above configuration on page 5, the input to be reproduced has terminals 3-6 at
frequencies other than the resonant frequency, and the series resonant circuit between terminals
4-6 exhibits high impedance, and the parallel resonant circuit between terminals 4-5 Indicates a
low impedance. Therefore, at the above frequency, the bass speaker units 7 and 8 are connected
in series. When the input is near the lowest resonance frequency, the series resonance circuit
between the terminals 3-5 and the terminals 4 to 6 exhibits low impedance, and the parallel
resonance circuit between the terminals 4.5 exhibits high impedance. Therefore, near the lowest
resonance frequency, the bass speaker units 7 and 8 are connected in parallel. The rated load
impedance of the amplifier 1o to be combined is R8, the input voltage between the input
terminals 1-2 is E, the nominal impedance of the bass speaker units 7 and 8 is 121, and the
impedance at the lowest resonant frequency is Zm = r × B42 / rm. I assume. Where r is the DC
resistance of the voice coil, B / is the force coefficient, rm is the mechanical resistance, and + z +
= r. At this time, in order to perform the parallel connection method shown in FIG. 1, page 6
IZII2Ro needs to be established, and at the lowest resonance frequency, P1: E2 / (2Ro + B62 /
rm) no power is supplied to each speaker unit. Ru. Sound pressure frequency characteristics at
this time and impedance characteristics viewed from the input terminal are shown in FIG. 4 a and
b. Next, in order to perform the series connection shown in FIG. 2, it is necessary to satisfy 121
≧ Ro / 2, and at the lowest resonance frequency, the power of P2- = E2 / (2F +4 B (12 / r m) is It
is supplied to the speaker unit. Sound pressure frequency characteristics at this time and
impedance characteristics seen from the input terminal are shown in FIG. 4 c and d. Therefore, in
the connection method shown in FIG. 3 provided by the present invention, 12 + ≧ Ro / 2 may be
satisfied, and P3 = E2 / (RO / 2B 1271m) = 4 × 2 / (2Ro + 4 B122 /) at the lowest resonance
frequency. The power of rm) is supplied to each speaker unit.
Sound pressure frequency characteristics at this time and impedance characteristics seen from
the input terminal are shown in FIG. 4e and f. Therefore, compared to the conventional speaker
system, the power is about 4 times the power at the lowest resonance frequency. The sound
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pressure can be increased because it is supplied from 10. The impedance of the speaker at the
lowest resonance frequency generally indicates a value several times to 10 times higher than the
nominal impedance, so even if two speaker units are connected in parallel, the combined
impedance is the rating of the amplifier 1o. It does not go below the load impedance. In the
embodiment, the parallel resonant circuit and the series resonant circuit are configured by only
the inductor and the capacitor. However, it is needless to say that a part of each resonant circuit
may include a resistor. As described in detail in the invention, according to the present invention,
compared with the conventional speaker system shown in FIG. 1 and FIG. 2, the minimum of the
speaker system does not cause any problems with the amplifier to be combined. Sound pressure
at the resonant frequency can be increased.
[0002]
Brief description of the drawings
[0003]
1 and 2 are block diagrams of the conventional speaker system, FIG. 3 is a block diagram of one
embodiment of the speaker system according to the present invention, and FIG. 4 is FIGS. 1 and
2, respectively.
FIG. 4 is a graph showing the sound pressure frequency characteristics of the Ssu beka system
shown in FIG. 3 and the impedance characteristics seen from the input terminal. 1.2 · · · · · · · ·
Input terminal, 3, 4, 5.6 · · · · · · Speaker unit input terminal, 7, 8 · · · · · · · · · · Loudspeaker unit, 9 · ·
· Cabinet, 1 o. Name of agent Attorney Nakao Toshio and 1 other person
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