The development of a compact two-way loudspeaker using a coincident source driver is described and contrasted to a small studio monitor loudspeaker designed at the BBC in the early 1970s.The latter loudspeaker, the LS3/5a, is still remarkably successful in the Hi-Fi market.This comparison provides an interesting contrast, with the LS3/5a designed primarily using empirical techniques and the new loudspeaker system relying heavily on numerical analysis and modern measurement methods.The progression in modelling and measurement technology since the early 1970s is briefly discussed.Following this, the driver technology used in the new loudspeaker system is summarised.The systematic application of lumped, finite element, and boundary element models in the design of the new loudspeaker is illustrated.A number of modelled results are included, demonstrating new design and modelling approaches.The performance of the new loudspeaker and LS3/5a is directly compared using acoustic and laser Doppler measurements.