Shure SM91 Stage / Boundary Microphone

The SM91 microphone is designed specifically for surface-mounted applications.


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  • Wide flat frequency response for accurate sound reproduction across the audio spectrum
  • Switch-selectable 12 dB/octave low-frequency cutoff permits tailoring response to suit conditions
  • Half-cardioid polar pattern minimizes pickup from rear of microphone, permits aiming microphone, e.g., toward performers and away from audience, or toward singers and away from instruments
  • High sensitivity and high signal-to-noise-ratio
  • Very low distortion and high output clipping level
  • Battery or simplex powering: uses standard 9-volt alkaline batteries; accepts wide range of simplex voltages – 11 to 52 Vdc
  • Low susceptibility to RFI, electrostatic and electro- magnetic hum
  • Extremely rugged construction of both microphone and preamplifier for outstanding reliability
  • Low profile and matte black finish for unobtrusive appearance on-camera or onstage; on floor, table, ceiling, wall, or lectern
  • Usable over very wide range of temperature and humidity