(1.85 mV); 1 Pa = 94 dB SPL Impedance Rated impedance is 150 ohms (300 ohms actual) for connection to microphone inputs rated low impedance Polarity Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 Connector Three-pin male XLR Net weight Awards In 2007 and 2008, the SM58 won the MI Pro Retail Survey "Best Live Microphone" award. In 2011, Acoustic Guitar magazine honored the SM58 with a Gold Medal in the Player's Choice Awards. Counterfeiting The SM58 and SM57 have been extensively counterfeited. Most of these counterfeit microphones are at least functional, but have poorer performance and do not have the pneumatic suspension. There are many other subtle details which can reveal most of these fakes. See also Shure SM57 Shure Beta 58A Shure MV7 References External links SM58 official page Shure Asia SM58 official page Shure SM58 history page SM58