Loudspeaker driver surround

A loudspeaker comprising a driver surround, the driver surround comprising a generally annular element of resilient material and having a central axis along which in use a diaphragm is driven, a first circumferential edge for fitment to an enclosure and a second circumferential edge for fitment to the diaphragm and/or a voice coil, with a roll surface extending between the edges which projects in the direction of the axis, wherein the roll surface has a shape formed by a plurality of axial corrugations extending generally radially with respect to the annular element between the first and second 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 first and second 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.