Once in a great while, a product transcends its basic function and becomes an icon - a cultural artifact. Most fade away as they are eclipsed by new technology or changing tastes, but some make such an indelible mark that their appeal never wanes. The Shure model 55SH Series II Unidyne Microphone is one such icon; it’s the professional audio industry’s answer to the ‘65 Ford Mustang or a pair of Levi’s 501 blue jeans.