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TECHNICAL FIELD The present invention relates generally to (loudspeaker) devices, and more
particularly to a novel technique for relatively economical and economical sound reproduction
with relatively inexpensive devices. (Background Art) The internationally acclaimed BO8E901,
601 ° 501. 301 and 201 speaker system by 2% balances the reflected sound and the direct
sound so that you can hear what you hear in a concert hall Implement the principle of simulating
at home. U.S. Pat. Nos. 4,133,975 and 4,266,092 disclose a woofer attached to the front panel
(bass speaker) and a toita attached to an angled panel near the woofer (high-pitched speaker)
The BO8E301O8-car system is disclosed and both speakers radiate into the listening area only
from the front of their respective speakers. A crossover or transition network arrangement is
provided which couples the electrical energy from the input pair to the woofer and toita, the
woofer and toitor emitting energy in a common frequency range. [Purpose] An important object
of the present invention is to provide an improved loudspeaker system. SUMMARY OF THE
INVENTION According to the present invention, a cabinet device for supporting a speaker drive
device (driver) is provided. By means of the cabinet arrangement, a first loudspeaker driver
supported is radiated forward over the acoustic energy '8-first frequency range and has a first
directional response characteristic. The second speaker driver comprises a toita supported by the
cabinet device. Over a second frequency range that is mostly higher than the first frequency
Sound energy inward from one surface. And it radiates outside from other surfaces. Preferably,
the radiation from the first surface is at the inner front and the radiation from the rear surface is
at the rear relative to the reflective surface. The second speaker driver consists of a rear open
toigator mounted on an angled bacfull with no obstructions both in the rear and in the front to
allow radiation from both surfaces 9. DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, a two-stereo system according to the invention is shown distributed to a room
10 adjacent to a rear wall 11 which intersects the left wall 12 and the right wall 13. The left
speaker cabinet 14L and the right speaker cabinet 14R are respectively woofer 15L and 15R.
The woofers 16L and 16R are disposed closer to the left wall 12 and the right wall 13 than the
woofers 15L and 15R, respectively.
The speaker cabinets 14L and 14R are arranged such that their mirror images and the axes of
the toators 16L and 16R conform to the longitudinal direction of the forward radiation indicating
patterns 17L and 17H. Each toya 16L. The 16R is attached to the baffle to provide the desired
low frequency toita response, and typically the front to back cancellation of the sound pressure
around the toita baffle starts at 2 KHz and drops by 20 dB at 500 Hz. Each toitator attached to
the baffle is arranged at an angle and displacement that is relative to the respective axes of the
woofer 15L, 15R, to provide a favorable balance of radiant energy outward with respect to
radiant energy inward. About 60% of the energy is first reflected off the wall before entering the
listening area and about 40% directly into the listening area to provide suitable acoustical
coupling with the woofer to provide a smooth midrange response. Each toitar attached to the
baffle is surrounded by an open grille which allows the acoustically transparent cabinet to
transmit an unobstructed sound from the enclosure in a controlled pattern. The high frequency
from each toita is directed inward for improved directional localization as shown by patterns 17L
and 17H, and improved as shown by patterns 18L and 18H shown in FIG. It is directed outward
to obtain a spatial stereo image. The outward radiant energy shown by the patterns 18L and 18H
is reflected by the side walls 12 and 13 respectively to provide a broad acoustic source, extends
beyond the loudspeaker cabinets 14L and 14R and enhances stereo separation over the entire
listening area . In FIG. 3 the front inner radiation 17L, 17R of a stereo system according to the
invention (FIGS. 1 and 2). Outer back radiation 18L, 18R, woofer pattern 19L. 19R is shown. The
synthesis provides the realistic sound quality of a concert hall that is properly stereo-isolated at
most locations in the two rooms. Referring to FIGS. 4, 5 and 6, there are respectively shown a
front view, a side view and a sectional view of a cabinet according to the invention. Cabinet) also
front panel 21, side panel 22. Rear panel 23. Front inclined panel 24. Rear inclined panel 25. A
top panel 26 and a bottom panel 27 are included. In the front panel 21, woofer 15L, L5R't
'accommodation opening 31 is formed.
The front inclined panel 24 is formed with an opening for receiving the port tube 32. The rear
panel 23 has an opening 23 for receiving the terminal panel. The inclined toyta baffle 34 is
formed with an opening 35 for housing the toytors 16L, 16R. The angle between the toyta baffle
34 and the front edge of the bottom panel 27 and the top panel 26 is typically 67 "and the angle
between the axis of the toytor aperture 35 and the front panel is approximately 33". The
diameter of the toita is approximately three times the width of the baffle section close to the
horizontal diameter of the toita opening 35. With reference to FIGS. 7, 8 and 9, a front view, a
rear view and a cross-sectional view, respectively, of a toita according to the invention are shown.
The toator has a basket 41 attached to the front plate 42 and a magnet 43 is sandwiched
between the front plate 42 and the back plate 431. The frame 41 supports the voice coil 44 and
supports the spider 4311, and the coil 44 has the center of the cone 45 h! Two can be attached.
The dust cover 46 covers the center of the cone 45. The end of the cone 45 is fixed to the end of
the frame 41 by a pad ring 47. Also, a rear terminal strip 51 is attached to the frame 41, and a
tensile (gold wire cord) 52 connects the lead of the voice coil to the terminal on the terminal strip
51. A large number of openings 53 are formed in the frame 41, and the openings radiate high
frequency energy rearward. The invention has many features. The inclined toyta powerfully
directs high frequency energy forward inside and back outward for reflection to achieve many
features. The sloped side panels support the port tube 32 to provide space behind the woofer
15L, 15R, providing space for woofer history. The ports extend into this space to prevent air
from hitting the grille cloth, preventing noise and flaps in the cloth. It is understood that only the
right cabinet is shown in FIGS. 4-6 and is similar to the left cabinet HX right cabinet. As described
above, the speaker apparatus of the present invention is characterized by a compact, relatively
inexpensive structure and a very realistic sound. However, it will be apparent to those skilled in
the art that many other variations and modifications are possible within the scope of the present
Brief description of the drawings
1, 2 and 3 schematically illustrate a stereo-speaker device according to the present invention,
wherein the speaker device is disposed along the rear wall of the room, and is respectively
directed forward and inward from the toator. The radiation, the radiation rearwardly outward
from the rear face of the toya, and the combination of the radiation of the toya and the woofer
are shown.
4 and 5 are front and side views, respectively, of a speaker cabinet according to the present
invention. 6 is a sectional view from 6-6 of FIG. 7 and 8 are front and rear views, respectively, of
the toator according to the present invention. FIG. 9 is a cross-sectional view from 9-9 of FIG. 7;
(Code film, bright)
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