The KSM137/SL from Shure is a cardioid condenser studio microphone designed for instrument recording and sound reinforcement. The KSM137/SL offers a wide 20 Hz to 20 kHz frequency response making it a flexible microphone for a variety of applications. The KSM137/SL features a cardioid element and permanently biased transducer design resulting in clean, accurate signal reproduction and frequency response. The transformer-less, class-A output circuitry provides a noise-free output signal path while maintaining high gain levels. The tight cardioid pattern is effective in attenuating off-axis signals due to room ambiance, instruments, monitor noise, etc.