Diaphragms for loudspeaker drive units

3-6. (canceled)

9-11. (canceled)

13-14. (canceled)

16-20. (canceled)

A diaphragm as claimed in claim 38, wherein the body of material is bound about by a number of turns selected from the group between 100 and 500 turns, and between 200 and 400 turns.

(canceled)

A diaphragm as claimed in claim 33, wherein the one or more elongate members are adhesively secured directly to the material of said block.

A diaphragm as claimed in claim 38, wherein the said first face of the block of the material and said one or more flexible members are arranged to act directly on the ambient air to radiate sound.

A diaphragm as claimed in claim 33, wherein the diaphragm is bonded to a central tubular member for carrying the voice coil of the loudspeaker drive unit.

27-32. (canceled)

A diaphragm for a loudspeaker drive unit, the diaphragm comprising a block of rigid plastic foam material containing one or more internal voids, said block having a first, sound-radiating front face and a second, rear face, and a multiplicity of turns of one or more elongate members of flexible material stiffened by a stiffening composition bound about over the first and second faces so as to stiffen said block.

A diaphragm for a loudspeaker drive unit, the diaphragm comprising a block of rigid plastic foam material, said block having a first, sound-radiating convex front face and a second, convex rear face, and a multiplicity of turns of one or more elongate members of flexible material stiffened by a stiffening composition bound about over the first and second faces so as to stiffen said block.