The performance of moving-coil loudspeakers compares unfavourably with other parts of a sound reproducing system: a fact emphasised by dramatic improvements which have taken place in programme sources, with the advent of digital audio.The performance deficiencies are very apparent at low frequencies, the reproduction of which demands large cone excursions and high power levels.During the last two decades, developments in moving coil loudspeaker driver technology seem to have concentrated more on cone/diaphragm performance.we have seen the widespread introduction of plastic cones, domes, and flat-plane direct radiators.The majority of loudspeaker units adhere to the original Rice-Kellogg structure, and the motor part, consisting of the
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David Birt (2024) studied this question.