This Shure SM81 is a high-quality small diaphragm, cardioid condenser microphone. Its flat, neutral frequency response, make it particularly well-suited for use on acoustic guitar, piano, cymbals and choirs.

This microphone requires phantom power and performs best with a 48 Vdc supply (IEC-61938). However, it will operate with slightly decreased headroom and sensitivity with supplies as low as 11 Vdc. Most modern mixers provide phantom power. You must use a balanced microphone cable: XLR-to-XLR or XLR-to-TRS.

MPN: PO SM81-LC
UPC: 042406051194

• Flat response curve for accurate reproduction of sound sources
  
• Low noise and high-output clipping level
  
• Low distortion over a wide range of load impedances
  
• Cardioid polar pattern effectively isolates source signal
  
• Low RF susceptibility
  
• Selectable low-frequency response: flat, 6 or 18dB/oct roll-off
  
• 0dB/10dB lockable attenuator switch
  
• Phantom powering (DIN 45 596 voltages of 12 to 48 Vdc)
  
• Rugged steel construction for durability
  
• Field-useable over wide range of temperature and humidity conditions
  
• Transducer: (Electret Bias) Condenser
  
• Polar Pattern: Cardioid
  
• Frequency Response: 20 Hz - 20 kHz
  
• Dynamic Range (Typical): 120 dB
  
• Signal-to-Noise Ratio: 78 dB, (@ 94 dB SPL, IEC 651)
  
• Maximum Input Sound Level: 136 dB, (@ 250 Hz 0.5% THD)
  146 dB, (with Pad)
  
• Power Requirements: Phantom 11 - 52v DC
  
• Output Impedance: 150 Ohms (85 Ohms Actual)
  
• Output Connectors: XLR-3M Type
  
• Pad: -10 dB Attenuation
  
• Low Frequency Roll-Off: -6 dB/Octave @ 100 Hz
  -18 dB/Octave @ 80 Hz
  
• Applications: Sound Reinforcement, Broadcast and Studio Recording.
  
• Dimensions: 212 x 23.5 mm LxDiameter
  
• Weight: 8 oz. (230 g)