Vintage loudspeakers

摘要

It was in 1924 that Chester Rice and Edward Kellog patented the direct radiator moving-coil loudspeaker drive unit. While other technologies have attempted to muscle in on the action with varying degrees of success, the drive units found in the vast majority of loudspeakers on the market today are still based on the very same technology the pair outlined 90 years ago. Of course, materials have grown more high-tech, driver shapes and sizes have changed and computers have aided designers in attaining the sort of performance that Rice and Kellog could only have dreamed of. But the basic principle remains the same.