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BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 · · · · · · circular cross section duct · · · · · · · · · ·
square cross section duct, · · · · · · · · · · · · · · · polygon cross section duct, Figure 4 ..... A duct having
a taper.
[Detailed description of the invention] The duct for reversing the phase of the bass reflex car: The
duct for reversing the phase of the car can be used conventionally the pipe made of salt Hiba
411 paper, but the degree of freedom of the sectional shape is small and the dumping effect is
insufficient. We have been pursuing better effects by filling the dump material etc., but there is
still nothing satisfying. The present invention is a tubular material having various cross-sections
made of various fibers, and the effect of dasive effect is extremely large, and it is easy to meet the
required characteristics because it has a high home grade as described later, and also
inexpensively Available puff 'f' 9'l 12e-71-M + 'lF%. It is a duct made of phase inversion zone 1.
Duct cross section for required characteristics, tube length. (1) Ll no l-T mi, ν 'tube taper, tube
thick wall thickness (fiber density) fiber type 11 thickness, inside and outside of the tube WA
cone "density difference 11 method of adhesion, etc. It is not possible to be satisfied freely with
C. The fiber may be any of a fiberglass, chemical fiber, natural fiber-1 inorganic woven cone, etc.
It was found that the single substance or a mixture of two or more bottles also has the
characteristic which contributed to the result of the experiment. □ □ As a method of adhesion
(1) Spray of adhesive solution 1 (2) impregnating adhesive solution and squeezing (3) powder
adhesive: m (4). □ 1 °, (5) low weight. □ If there is mixing of composite fiber of melting point,
etc. and if molding: Method "" I! (1) Method of winding the core material 9 into the core material
9 (2) Method of pressure-filling the mold (3) Method of filling the mold by suction or the like. As
described above, the combination is pi-free, and it is easy to forego the required physical
properties. In addition, since the mechanical coloring is free, the duct excellent in aesthetics can
be obtained as "1. 62" (2)