Shure KSM44 Large Dual-Diaphragm Microphone Three polar patterns (Cardioid, Omnidirectional, and Bidirectional) for greater flexibilty in a wide variety of recording applications. Transformerless preamplifer circuitry provides extremely flat transient response and no crossover distortion for improved linearity across the full frequency range Low frequency filter virtually eliminates background noise 15 dB attenuation switch handles very high input SPL sources Ultra-thin, dual diaphragms for precise sound articulation Low frequency filter virtually eliminates background noise 15 dB attenuation switch handles very high input SPL sources Ultra-thin, dual diaphragms for precise sound articulation Three polar patterns for greater flexibilty in a wide variety of recording applications. Transformerless preamplifer circuitry provides extremely flat transient response and no crossover distortion