Vintage Shure SM18B-50 sm 18 small pzm Dynamic Cardioid Mic low impedance inst
MODEL NUMBER MARKED ON THIS ITEM IS: SM18B. Polar Pattern: Cardioid (Unidirectional). Foam block is. Impedance: 150 ohms for connection to mic inputs rated at 19-300 ohms. NOT included. Frequency Response: 1 50 Hz.