Mic Test: Shure SM57 vs Beta 57A (guitar cab) - YouTube
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Amazon.com: Shure BETA 57A Instrument Microphone - Supercardioid Dynamic Mic for Vocal and Instrumental Applications with High Output Neodymium Element, Durable Steel Mesh Grille and Shock Mount : Musical Instruments
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BETA 57A - Dynamic Instrument Microphone - Shure USA