The �Shure Beta 91A� is a boundary microphone that can double as a kick drum microphone, as it can capture the punch and attack of low-frequency instruments such as bass drums. It has a wide frequency response that is well-suited for capturing a variety of audio signals such as organ and piano. The flat contour design also helps produce a strong, solid bass response, as well as making it easy to mount inside a bass drum. The Beta 91A is ideal for both recording and sound reinforcement. The Shure Beta 91A is a boundary microphone that can double as a batting microphone, as it can capture the punch and attack of low-frequency instruments such as kick drums (bass). It features a wide frequency response suitable for capturing a variety of audio signals, such as organ and piano. The flat, frontier design is also geared towards producing a strong, solid low-end response, as well as making it easy to mount inside a bass drum. The Beta 91A is ideal for both recording and sound reinforcement alike..PZA MORE SPECS