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TECHNICAL FIELD The present invention relates generally to electro-acoustic conversion, and
more particularly to an improved system for providing acoustic reproduction in a room.
BACKGROUND ART A prior art indoor speaker system, available from Pose Corporation under the
tradename AM-5, is a stereo-review (April 1987). J., Persh [Pause AM-5 Speaker System] r Hirsch,
J, Bose AM-55 Peaker System Stereo Review (April 1987)) ("Birsch"), which is incorporated
herein by reference. The AM-5 system is equipped with a non-predictable boat woofer module.
That is, the position of the woofer module can not be determined due to busy listening. The
enclosure in the woofer module is in the form of a box with two openings and is usually arranged
on the floor near the wall. The structure and operation of a non-position inferable boat woofer
used in the AM-5 speaker system is described in U.S. Pat. No. 4,549,651, which is incorporated
herein by reference. SUMMARY OF THE INVENTION Generally, the present invention is mounted
on the outside of a chamber and is the surface that bounds the chamber (i.e., side walls, floors).
Or an unpredictable woofer module leading to an opening in the ceiling), and an improved
shadow system for covering sound reproduction in a room using an upper frequency driver
located in the room. Therefore, the relatively large woofer module does not need to occupy room
space, and the non-predictable nature of the woofer module provides good low frequency sound
in the room. In the preferred embodiment, the woofer module has an enclosure with baffles that
supports the woofer driver and divides the interior into first and second compartments. These
compartments lead to an end chamber in the enclosure and this end chamber leads to an
opening at the chamber interface. In another embodiment, the non-predictable woofer module
comprises an acoustic waveguide. Other advantages and features of the invention will become
apparent from the following description of the preferred embodiments thereof and the respective
claims, as will be apparent from the drawings and the respective claims. A ceiling 12 and a floor
14 are shown. Under the floor, an unestimable (sound image delocalization) woofer module 16 is
attached. This leads to an opening in the floor 14 below the grid 20.
A left speaker cube 24 and a right speaker cube 26 are attached to a track 22 in the ceiling 12.
The speaker cubes 24.26 are the same, with each cube of the pair pointing in a different
direction. Each speaker 24. 2 <5 is approximately 10.16 cm (4 in.) Along each side, has a 162 c
IrL (5 in.) Driver, and has a frequency response of 200 Hz to 18 KHz, ± 6 dB. have. The speaker
cubes 24, 26 thus provide an upper frequency driver. The unpredictable woofer module 16 is
approximately 58.42 cm x 50.48 c IrL x 1778 (23 "x 12" x finch) and is equipped with two 15.24
cm (6 ") low frequency drivers, and It has a frequency response of AO Hz to 180 Hz, ± 6 d, B.
Unpredictable woofer modules 16 are described in detail in U.S. Pat. No. 4,549,651 ("the '631
patent"). The opening 18 in the floor 14 is approximately 6 inches from the side wall 10 behind
it, and is on the same side of the chamber as the speaker cube 24.26. The opening 18 is located
at least 2.4 mCB mC-t from the main listening area in the room. The volume control switch 28 is
attached to the side wall 10. Referring to FIG. 2, an audio electrical signal is provided by the
amplifier 30 to the unpredictable woofer module 16 and the speaker cube 24.26. Wall mounted
sound! An adjustment switch 28 is also connected to the amplifier 50, and the amplifier receives
an audible electrical signal from a music center 52, which includes, for example, a tuner and a
cassette player. Referring to FIGS. 6-5, the non-predictable woofer module 16 has a slotted
opening 34 at one end of its box-like enclosure 36. An enclosure 36 is mounted between
adjacent joists 68 by brackets 40 below the floor 14. A 15.24 L: ML (6 in.) Low frequency driver
42 is attached to the tilt baffle 44 within the enclosure 36, and this baffle divides the woofer area
within the enclosure into two compartments. Each chamber communicates with an end chamber
52 through a respective port tube 46.48 through the wall 50, which communicates with the
slotted opening 64 ° C. By providing a slotted opening '54 in one of the two basics of the
enclosure 66 with the end chamber at the end of the enclosure 36 and with the largest area, the
enclosure 36 has its minimum dimensions It can be mounted extending down from the floor 14
to facilitate installation and avoid taking up space.
A non-predictable woofer module 16 could be attached to another chamber interface, for
example to the side wall 10 or to an opening in the ceiling 12. It is desirable that the opening 18
be near the boundary of the two faces, for example near the side wall 10 at the ceiling 12 or near
the ceiling 12 or floor 140 at the side wall 10, but this is desirable in this embodiment (. It is
desirable to be spaced from the corner of the chamber to avoid Opening 18 is preferably located
at least 8 feet (2.4 feet) from the main listening area for better acoustic balance from cubs beaker
24.26 and woofer module 16. -It is desirable for the unpredictable woofer module 16 to be
placed at the end of the same room as the cube speaker 24.26, but for a non-predictable woofer
module 16 The bass given by can be placed anywhere because position estimation is not
possible. The non-predictable woofer module 16 is preferably located further from the listener
than the cube speaker 24.26 when mounted at the end of the chamber opposite the cube speaker
24. The aperture 18 is preferably located within 15.24 cm (6 inches) of one of the walls for
improved bass response. The opening 18 is preferably close to or on the side wall 10, which is
the outer wall of the building, to reduce the opportunity for low frequency sounds to be heard in
other rooms. In operation, the speaker cubes 24, 26 provide intermediate and high frequencies,
and the unpositionable wafer module 16 provides low frequencies. The non-predictable woofer
module 16 has a 7631% tolerance and barsh literature except that the end chamber 52 and the
associated slotted opening 54 divert acoustic energy from the boat tube 46.48 to the opening 18.
Acts as described 5 The boat tubes 46.48 contain an acoustic mass that resonates with the
compliance of the air in the respective compartments, and the blockage low enough that the low
frequencies provided by the non-predictable woofer module 16 become unpredictable Establish a
frequency. Therefore, the listener can not easily confirm the position of the woofer module, so
the relatively bulky woofer module enclosure does not have to be located in the room. Other
Embodiments Other embodiments of the invention are possible within the scope of the claims.
For example, the unpredictable woofer module 16 could use other passive radiators (eg, drone
cones) instead of the boat tube 46.48, as described in US Pat. No. 4,282,605. It may also be of
the type provided with an acoustic waveguide as described. This US patent is incorporated herein
by reference. The non-predictable woofer module 16 could also be designed by other techniques
such as providing acoustic low pass filtering to make it non-predictable. Unpredictable woofer
modules 16 may also be designed to allow optimal operation away from the side walls or near
the corners of the room.
Brief description of the drawings
FIG. 1 is a diagrammatic perspective view of a room provided with a loudspeaker system
according to the invention.
FIG. 2 is a block diagram of the indoor speaker system of FIG. 1 and associated electronic
circuits. 6 is a perspective view of the woofer module used in the speaker system of FIG. FIG. 4 is
a perspective view of a partial cutaway showing the mounting of the woofer module of FIG. 6
below the floor of the chamber. FIG. 5 is a partially cut away and disassembled perspective view
of the woofer module of FIG. 4;
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