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Abstract: A speaker device for performing bass reproduction as a part of a speaker system for
music reproduction, a horn length and a wide mouse long and long enough to reproduce a
natural bass that is sufficient and smooth just by attaching a commercially available speaker unit
To make a front-loading speaker box that is flat and fits into a rectangular box of a size that can
be used normally in a home. SOLUTION: As a box shape of a rectangular parallelepiped, a throat
having a large cross-sectional area is adopted, and by adopting this letter-shaped horn shape in
which all three sides of the bottom rear surface top plate surface of the rectangular box are the
sound path outer wall. The longest horn length is secured, and by making the entire box front the
horn opening, the largest horn mouse cross section is secured. [Selected figure] Figure 1
Front load speaker box
The present invention relates to the design of a speaker box for a speaker system for music
reproduction, for speakers responsible for bass reproduction, ensuring a maximum horn length
and obtaining a maximum horn mouse cross-section in a box of limited size. It is a thing.
Among the speaker systems intended for music reproduction, the shape of the speaker in charge
of the bass reproduction is an open back type, a closed box type, a bass reflex type, a back load
horn type, a short front load type with a horn length of 40 cm or less, etc. Is used as a
conventional type.
However, in the case of the open rear face type and the short front load type, the low frequency
of 200 Hz or less of the sound wave coming out from the front and rear faces of the speaker is
offset by the front and back and it becomes difficult to get out. Sound is easy to occur, smooth
and smooth bass reproduction is not possible, and the bass reflex method intentionally designed
by emphasizing a specific frequency band has a weak point that natural music reproduction can
not be performed, and it is insufficient as a bass reproduction device It was just something. In
addition, the conventional type of front road is not suitable as a music player for general home
use because the depth or height of the device is huge.
It can be placed in one room of a general household of 6 mats or more, and simply attach a
commercially available 20 cm to 38 cm speaker unit that is easily available to anyone, and the
natural bass such as a pipe organ from 30 Hz is natural Making a front-loaded speaker box for
bass reproduction that can be played well with
Adopting a throat with a cross-sectional area of 300 cm 2 or more, and adopting this figureshaped horn shape in which all three sides of the rectangular parallelepiped are sound paths, a
horn length of 140 cm or more is secured. We designed a front loading box that can be loaded to
around 100 Hz by securing a horn-mouth cross section of 4,400 cm 2 or more by using a horn
If the frequency is 100 Hz or less, although the box is theoretically loaded, the floor on which the
box and the box are installed becomes an extension of the sound path, so that the bass up to
around the lowest resonance frequency of the speaker unit used can be reproduced.
As described above, by adopting the front loading system, bass sounds from around 30 Hz to
around 3,000 Hz are not attenuated like those of the conventional system in the vicinity of 30200 Hz, and no particular frequency band is emphasized. I was able to reproduce smoothly
naturally. In addition, it became possible to install in the narrow space of the general household
of around 6 mats.
The speaker unit is attached downward to the lower part of the rectangular parallelepiped
speaker box, and the bottom, rear and top are used as outer walls of the sound path, and the
entire front is a mouse. In addition, the sound path in the front part is a horn shape having a
curved curved surface on which load is uniformly applied. The speaker unit uses a nominal size
of 20 cm to 38 cm.
The speaker box and unit will be used for bass, and the middle and high-pitched part will be
separately prepared and combined with a tweeter exclusively for high-tone reproduction and a
squawker exclusively for middle-tone reproduction. The division of the reproduction frequency
band for each of the low, middle and high tones is performed by separately preparing a network.
A two-way system that reproduces the whole with two devices for bass and treble according to
the characteristics of the speaker unit to be used, a three-way system further adding a medium
sound, or further dividing the frequency band into four Set up a device that plays the entire
music as a way, 5 way.
In the cross-sectional view seen from the side, the speaker unit is fixed to a unit mounting baffle
plate provided at the lower part. The sound of the speaker travels from the throat toward the
bottom plate, and while the bottom plate-back plate-top plate are loaded as walls of the
respective sound paths, the entire front of the box is released into the air as the horn mouth
Explanation of sign
1 Side of front load speaker box 2 Baffle plate for attaching speaker unit 3 Throat section that
emits sound from the speaker to sound path 4 Shielding sound from the back of the speaker and
blocking plate as horn 5 from the back of the speaker 5 A blocking plate that blocks the sound
and forms a horn at the curved portion 6 A mouse that serves as the horn opening, and an
opening that faces the entire front of the box 7 The inner wall of the sound path of the horn 8
The inner wall of the sound path of the horn 9 The inner wall of the sound path of the horn 10
speaker unit