Shure SM58 Unidyne III Cardioid Dynamic Microphone

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The SM58 is launched in 1966 and still in production. It is a low-impedance cardioid dynamic microphone used extensively in amplified music, perhaps the most prevalent microphone in live events and concerts. As the SM57, it is equipped with the Unidyne III element developed by engineer Ernie Seeler in the late 1950s. That mic element is the engine of the SM58, SM57, 545, and 565.

The SM58 differs from the SM57 in only a few respects. The ball grille contains a foam blast filter and reduces the bass boost due to proximity effect, simply because it prevents the mic’s capsule from being positioned so close to a sound source. The dynamic cartridge has a different resonator disk than is found on the SM57. The frequency response tailored for vocals, with brightened midrange and bass rolloff. The uniform cardioid pickup pattern isolates the main sound source and minimizes background noise. A pneumatic shock-mount system cuts down handling noise. And it has a built-in spherical wind and pop filter.
(source: recordinghacks.com)