The Shure KSM27 is a side-address condenser microphone with a cardioid polar pattern. Designed for studio use, but rugged enough for live applications, the KSM27 has an externally biased, 1-inch diaphragm, extremely low self-noise, and an extended frequency response specially tailored for vocal tracking and instrument recording. Large single-diaphragm, side-address condenser microphone. Designed for studio use but rugged enough for live applications, the KSM27 has extremely low self-noise, and an extended frequency response specially tailored for vocal tracking and instrument recording.