R&D Report 1966-28 : The design of a low-frequency unit for monitoring loudspeakers. H.D. Harwood The present state in the design of low-frequency loudspeaker units is reviewed and the areas where improvement is desired are indicated. Experimental details are given leading to the design of 12 in. (305 mm) unit incorporating a vacuum-formed cone of toughened polystyrene with a p.v.c. (poly-vinyl chloride) surround and it is shown by objective and by listening tests that this design is...
Topics: cone, frequency, surround, mould, unit, shape, characteristic, axial, goodmans, loudspeakers,...

BBC Monograph 78: Aspects of High-quality Monitoring Loudspeakers. H.D. Harwood, S.A. Hughes, C.L.S. Gilford.
Topics: loudspeaker, bbc, sound, television, broadcasting, loudspeakers, monitoring, frequency, quality,...

R&D Report 1967-57 : The design of studio monitoring loudspeakers Types LS5/5 and LS5/6 H.D. Harwood, S.A. Hughes Details are given of the various factors which have led to the design of two new monitoring loudspeakers suitable for use in studios and outside broadcasts. The loudspeakers are much smaller than those of the present type; a floor standing model is designated type LS5/5, and one intended for hanging is called type LS5/6. In the course of the design, the questions of bass...
Topics: frequency, unit, loudspeaker, slit, axial, type, bass, khz, loudspeakers, characteristics, axial...