Shure High Quality Instrument Microphone The Beta 57A is a precision-engineered dynamic microphone designed for detailed reproduction of amplified or acoustic instruments. A tight supercardioid polar pattern provides high gain before feedback in demanding environmentsConsistently excellent performance has made Beta Microphones the choice of top performers worldwide. Renowned for their warmth, presence and sensitivity to fine detail, Beta cartridge configurations and carefully tailored response curves are as distinctive as the artists who prefer them. The Beta 57A is a precision-engineered dynamic microphone designed for detailed reproduction of amplified or acoustic instruments. A tight supercardioid polar pattern provides high gain before feedback in demanding environments. It's a premium instrument mic ideally suited for the professional musician looking to mic up many types of amplified and acoustic instruments such as guitar amps, acoustic guitar, saxophone, snare drum and brass. I