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JPS57131079

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DESCRIPTION JPS57131079
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B show a conventional wiring structure
of a multi-way speaker system, and FIG. 2 shows an embodiment of the wiring structure of a
multi-way speaker system according to the present invention. is there. IN ··· System input
terminal · · · · · · · · · · Network input terminal hot side E · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · side, S ······ squawkers output
terminal hot side, W ······ woofer output terminal hot side.
DETAILED DESCRIPTION OF THE INVENTION j = -1- "3), .rho. 7868 The present invention relates
to the wiring structure of the ground wire in a multi-way speaker system. Conventionally, most of
the multi-way speaker systems in which the tweeter, the squawker, and the woofer tx tox beaker
are respectively driven by the network-divided audio signal by the network are the booth points
shown in FIG. A common earth terminal EVc of the network One of a concentrated book or 0 The
system input of the whole multi-projector speaker system is roughly divided into two groups: one
concentrated at the child IN earth side. Although this is in the form of either-for convenience of
wiring, as long as it is used by connecting to a vacuum tube type power amplifier or the like
having a low damping factor, problems occur due to these wiring structures. Because there was
no such thing, there are many things that follow the wiring structure such as recent speaker
systems. However, the load drive capability of the recent transistor type power amplifier has
been dramatically improved, and the following problem has occurred. ,? ! Since it has become
possible to secure high damping 7 actors even at the front end of the 8G 9-K cord, the abovementioned earth via the system electronic IN earth weir 1 from the power amplifier output
terminal earth side. The influence of the minute common impedance present in the ground line
leading to the point can not be overlooked, ie, each band audio signal distributed to each speaker
after the network due to the presence of such minute common impedance As a method to
eliminate this, the interference control output sK current is reversed by the impedance control
circuit with the earth point as the sensing point. Amplifier output module Earth side Impedance
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component existing between the ground points There are things to offset. However, it is only
from the power amplifier output terminal to the ground point that the impedance component can
be canceled by the method as described above, from the ground point to each speaker and net-3÷ X, · · · · · · W'p ')': +. 1 bowl ・ ・ ・ ・ ・ 1. It is inevitable that the impedance component
present in the ground wire up to 1 mm will remain. For this reason, the voice coil of the woofer
with the largest back electromotive force can not be driven with low impedance especially, and
there existed a problem to which dumping worsens.
An object of the present invention is to provide a wiring structure of a multi-way speaker system
which solves the above-mentioned conventional problems. An embodiment of the present
invention will be described based on FIG. 2 in the following embodiment. In the embodiment of
the present invention, the ground point F is taken to the ground terminal of the input terminal of
the woofer, and the input terminal ground side of other speakers and the output of the network.
The 4-pole earth side is a single point concentrated wiring field here, and the system input
terminal IN earth side of the whole system is also connected to this point. Furthermore, this point
is to be drawn out to the impedance control circuit as a sensing point. According to the above
configuration, the power amplifier output terminal ground side to the system input terminal IN
ground side: 4-1 1-: 1, 871 'p' nil. It is possible to offset the impedance present in the Therefore,
it is possible to drive the woofer's voice coil, in which the back electromotive force is the largest,
in particular, without the influence of the impedance, and the mutual interference with the
tweeter and the squawker can be extremely reduced. As described above, according to the wiring
structure of the multi-way speaker system according to the present invention, the voice coil of
the woofer can be driven with a low impedance, and the mutual interference between the
speakers can be almost eliminated, etc. Is suitable for this kind of speaker system.
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