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modèle Crystal 7308 cardioïde fabriqué à Chicago aux États-Unis; voir http://www.prosoundweb.com/install/commentary/kc/shure/time/time.shtml; voir aussi http://www.historyofpa.co.uk/pages/microphones.htm CRYSTAL Similar principle to, but an advanced style of carbon mic. In this case the diaphragm is attached to a piece of quartz crystal, which again when the diaphragm is vibrated by air waves, sets up an electric current in the crystal, which is then transferred to the amplifier. This works on the same principal as a crystal pickup cartridge, except that in this case, the crystal is vibrated by the movements of the stylus attached to it. Crystal microphones are of high impedance, better quality than carbon and quite sensitive, but also again poor "back to front" ratio
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