R&D Report 1988-14 : On the design of loudspeakers for broadcast monitoring. C.D. Mathers By designing its own monitoring loudspeakers for about the past forty years, the BBC has achieved a degree of continuity and consensus in a subject where there are almost as many opinions as there are designers. This report describes the approach that has evolved within the Corporation towards design and assessment, and indicates how calculation and objective measurement are supplemented by experience and subjective judgement to arrive at a design that is acceptable to users in the broadcasting service. Each component of the loudspeaker is considered, and the problems of achieving consistency and reliability are addressed.