LOUDSPEAKERS Lowther Audiovector horn loudspeakers with PM4A drivers, designed 1958 Lowther PM6A loudspeakers in Acousta cabinets, 1957 Rogers LS3/6 BBC Studio Monitor Speakers, c.1968 Tannoy 12″ Monitor Red loudspeakers in Chatsworth corner cabinets, 1958 Tannoy 12″ Monitor Silver loudspeaker in Canterbury corner cabinet, 1957 Tannoy 15″ Monitor Silver loudspeakers in York corner cabinets, 1953