B & W Loudspeakers Limited

Peter Alexander Fryer

Stuart Michael Nevill

Stephen Philip Barnham Roe

A loudspeaker drive unit (,) comprises a diaphragm (,), a chassis member (,) and a surround (,) connecting the outer portion of the diaphragm to the chassis member in which (i) substantially all parts of the surround (,) located between the diaphragm (,) and the chassis member (,) and capable of radiating sound are arranged parallel or at an acute angle with respect to the longitudinal axis of the loudspeaker drive unit (,), or (ii) the surround is made of a body of foam material (,) arranged to be compressed against the chassis member (,) when the diaphragm (,) moves towards the chassis member, or (iii) the bending wave impedance of the surround (,) is matched to the bending wave impedance of the diaphragm (,).

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W. Sussex, United Kingdom

Peter Alexander Fryer