An acoustic structure includes a first, rigid panel (7), a second, rigid panel (11) aligned in spaced, substantially parallel, relationship with the first panel (7), a multiplicity of partition walls (15) running transverse to the panels of the panels (7, 11) and dividing the interior space of the e
An acoustic structure includes a first, rigid panel (7), a second, rigid panel (11) aligned in spaced, substantially parallel, relationship with the first panel (7), a multiplicity of partition walls (15) running transverse to the panels of the panels (7, 11) and dividing the interior space of the enclosures into a single layer of cells (17) bounded at one face by the inside of the first panel (7) and bounded at the opposite face by the inside of the second panel (11), the partition walls (15) being bonded at the one face to the inside of the first panel (7) and at the opposite face to the inside of the second panel (11), and a multiplicity of apertures (19) in the partition walls (15) providing communication between adjacent cells of the single layer of cells (17).
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1. An acoustic structure comprising:a first, rigid panel, a second, rigid panel aligned in spaced, substantially parallel, relationship with the first panel, a multiplicity of partition walls running transverse to the plan s of the panels and dividing the interior space of the acoustic structure int
1. An acoustic structure comprising:a first, rigid panel, a second, rigid panel aligned in spaced, substantially parallel, relationship with the first panel, a multiplicity of partition walls running transverse to the plan s of the panels and dividing the interior space of the acoustic structure into a single layer of cells bounded at one face by the inside of the first panel and bounded at the opposite face by the inside of the second panel, the partition walls being bonded at the one face to the inside of the first panel and at the opposite ace to the inside of the second panel, and a multiplicity of apertures in the partition walls providing communication between adjacent cells of the single layer of cells, and in which: the cells each have a cross-sectional area parallel to the panels in the range 0.25 to 10 cm2, the apertures each have a cross-sectional area of at least 0.04 cm2, and at least 55% of the wall between a cell and an adjoining cell is imperforate. 2. A structure as claimed in claim 1, wherein the spacing of the first and second panels is selected from the group consisting of the range 10 to 50 millimetres, the range 15 to 35 millimetres, and the range 20 to 30 millimetres.3. A structure as claimed in claim 1, wherein the cells each have a cross-sectional area selected from the group consisting of the range 0.5 to 4 cm2, the range 0.6 to 2 cm2, and range 0.8 to 1.5 cm2.4. A structure as claimed in claim 1, wherein the apertures each have a cross-sectional area selected from the group consisting of at least 0.1 cm2, and the range 0.15 to 0.25 cm2.5. A structure as claimed in claim 1, wherein the percentage of the wall between a cell and an adjoining cell which is imperforate is selected from the group consisting of at least 60%, and at least 70%.6. A structure as claimed claim 1, wherein the diameter of the cells is selected from the group consisting of between 15 and 50 millimetres, and between 20 and 30 millimetres.7. A structure as claimed in claim 1, wherein sound absorbent material is provided within some or all of the cells.8. A structure as claimed in claim 1, wherein said structure is selected from the group consisting of a horn-type loudspeaker unit, a labyrinth-type loudspeaker unit, and a flat panel loudspeaker system.9. A structure as claimed in claim 1, wherein at least three of said panels in spaced, substantially parallel relationship are provided, there being a respective single layer of cells between each adjacent pair of panels, the or each panel that lies between two adjacent layers of cells including a multiplicity of apertures providing communication between cells of the adjacent layers of cells, the number of flat panels being selected from the group consisting of 2, 3, 4, 4 or more, and 5 or more panels.10. A loudspeaker system comprising:a first, rigid panel, a second, rigid panel aligned in spaced, substantially parallel, relationship with the first panel, a multiplicity of partition walls running transverse to the planes of the panels and dividing the interior space of the loudspeaker system into a single layer of cells bounded at one face by the inside of the first panel and bounded at the opposite face by the inside of the second panel, the partition walls being bonded at the one face to the inside of the first panel and at the opposite face to the inside of the second panel, a multiplicity of apertures in the partition walls providing communication between adjacent cells of the single layer of cells, one of said panels forming the front of the loudspeaker system and having an opening therein for mounting a loudspeaker drive unit, a peripheral wall running about the periphery of the structure to enclose the space within the structure, and a loudspeaker drive unit mounted in the said opening, and wherein the spacing of the first and second panels is in the range 20 to 50 millimetres the cells each have a cross-sectional area in the range 0.25 to 10 cm2, at least 70% of the wall between a cell and an adjoining cell is imperforate. and the partition walls are less than one tenth the thickness of the panels. 11. A loudspeaker system comprising:a first, rigid panel, a second, rigid panel aligned in spaced, substantially parallel, relationship with the first panel, a multiplicity of partition walls running transverse to the planes of the panels and dividing the interior space of the loudspeaker system into a single layer of cells bounded at one face by the inside of the first panel and bounded the opposite face by the inside of the second panel, the partition walls being bonded at the one face to the inside of the first panel and at the opposite face to the inside of the second panel, a multiplicity of apertures in the partition walls providing communication between adjacent cells of the single layer of cells. one of said panels forming the front of the loudspeaker system and having an opening therein for mounting a loudspeaker drive unit, a peripheral wall running about the periphery of the structure to enclose the space within he structure, and a loudspeaker drive unit mounted in the paid opening wherein: the cells each have a cross-sectional area parallel to the panels in the range 0.25 to 10 cm2, the apertures each have a cross-sectional area of at least 0.04 cm2, and at least 55% of the wall between a cell and an adjoining cell is imperforate. 12. A loudspeaker system as claimed in claim 10, wherein the apertures are in the form of slots at the edges of the partition walls.13. A loudspeaker system as claimed in claim 10, wherein each cell has two walls parallel to each other defined by parts the partition walls, and apertures are provided in the said two walls parallel to each other.14. A loudspeaker system as claimed in claim 10, wherein the apertures are arranged in pairs, one aperture of each pair being adjacent the first panel and the other being adjacent the second panel.15. A loudspeaker system as claimed in claim 10, wherein the arrangement of the apertures is non-uniform.16. A loudspeaker system as claimed in claim 10, wherein the partition walls are formed by a multiplicity of inter-connected lamellae expanded into a network of cells.17. A loudspeaker system comprising:a first, rigid panel, a second, rigid panel aligned in spaced, substantially parallel, relationship with the first panel, a multiplicity of partition walls running transverse to the places of the panels and dividing the interior space of the loudspeaker system into a single layer of cells bounded at one face by the inside of the first panel and bounded at the opposite face by the inside of the second panel, the partition wall being bonded at the one face to the inside of the first panel and at the opposite face to the inside of the second panel, a multiplicity of apertures in the partition walls providing communication between adjacent cells of the single layer of cells, one of said panels forming the front of the enclosure and having an opening therein for mounting a loudspeaker drive unit, a peripheral wall running about the periphery of the structure to enclose the space within the structure, and a loudspeaker drive unit mounted in the said opening and wherein the spacing of the first and second panels is in the range 10 to 50 millimetres. the cells each have a cross-sectional area in the range 0.5 to cm2, at least 60% of the wall between a cell and an adjoining cell is imperforate, and the partition walls are less than one tenth the thickness of the panels. 18. A loudspeaker system as claimed in claim 17, wherein elements selected from the group consisting of the partition walls the panels, and the partition walls and the panels are made of a material having a Young's modulus greater than 50 GPa.19. A loudspeaker system as claimed in claim 17, wherein the shape of the cells is selected from the group consisting of polygonal and hexagonal.20. A loudspeaker system as claimed in claim 17, wherein the partition walls are adhesively bonded to the panels by means of an adhesive selected from the group consisting of an adhesive having low resilience when set, and an epoxy resin adhesive.21. The loudspeaker system as claimed in claim 10, wherein he cells each have a cross-sectional area up to 4 cm2.22. The loudspeaker system as claimed in claim 11, wherein the cells each have a cross-sectional area up to 4 cm2.
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