Make Your Own Loudspeaker From Scratch

A loudspeaker is a vital component of every device that plays sound, but while its operation is simple, it’s a surprisingly difficult device to build. [Rvanderouderaa] has made an Instructables post showing a speaker design that it’s claimed, had an impedance that varies by volume (Dutch language, Google Translate link ). In all moving-coil speakers, a coil of wire is held in a radial magnetic field.