Gp Acoustics (uk) Limited

Allan James Skellett

Jack Anthony Oclee-Brown

A loudspeaker driver surroundcomprises a flexible, generally annular element having a central axisalong which in use a diaphragm is driven, an outer edgefor fitment to an enclosure and an inner edgefor fitment to the diaphragm, with a roll surface which extends between the edges and which projects in the direction of the axis, wherein the roll surface has a shape formed by a plurality of axial corrugationsextending generally radially with respect to the annular element between the outer and inner edges thereof, the corrugations being shaped and configured such that the roll surface is non-axisymmetric about the axis, and the arrangement being such that cross-sections of the roll surface which extend radially with respect to the annular element between the outer and inner edges thereof have a substantially constant length at all circumferential positions around the annular element and so that the shape of the said cross-section varies continuously between circumferential positions around the annular element, the corrugations giving the projecting roll surface an order of rotational symmetry of at least 30.

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London, United Kingdom

Allan James Skellett