Shure's Classic Unidyne Instrument Mic Vintage mic aficionados at Sweetwater are stoked — Shure's classic Unidyne instrument microphone is back, and better than ever. In the late 1960s, Shure's Unidyne III technology evolved into the SM57 we know and love; a mic that became a cornerstone of all genres of music. But before the SM57, there was the 545; and it was a fixture on stages and in studios around the world.Impressive versatility Today's 545SD features dual-impedance operation and a uniform cardioid polar pattern that make it a versatile dynamic mic for the capture of many types of instruments as well as for use on lecterns in public address systems. Its lockable on/off switch further increases its impressive utility.
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