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Its boundary effect design produces a strong solid low end response that has been specifically tailored for heavy bass applications. Its cardioid pattern provides outstanding gain before feedback and superior rejection of unwanted sound making the Beta 91 ideal for live concert applications. Whats more the low profile design of the Beta 91 eliminates the need for external mounting hardware while its heavy duty triple flex cable represents a significant improvement over its highly successful predecessor the SM91A. And it all comes together in a durable design that lives up to Shures legendary standards for quality reliability and great sound.