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Shure SM81-LC Unidirectional Condenser Instrument Microphone
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    Shure SM81-LC Unidirectional Condenser Instrument Microphone

    Manufacturer: Shure Inc

    Item #: SM81-LC   •   MFG #: SM81-LC


    List Price:$436.00
    Our Price:$349.00

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    Availability: In Stock
    Item is Available for immediate shipping from our warehouse.



      The Shure SM81 is a high-quality, unidirectional condenser microphone designed for studio recording, broadcasting, and sound reinforcement. Its wide frequency response, low noise characteristics, and low RF susceptibility have made it a standard for applications involving acoustic instruments, especially guitar, piano, and cymbals.

      The SM81 is ruggedly constructed. It operates on phantom power and performs over a wide range of temperatures and humidity conditions. It is furnished with a swivel adapter, attenuator-switch lock, foam windscreen, and case for carrying and storage. Other accessories are available.

      The Shure SM81-LC comes with a windscreen but no cable. Phantom power required.

      • Features

        • 0 Hz to 20 kHz frequency response
        • 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, uniform with frequency and symmetric about axis, providing maximum rejection and minimum coloration of off-axis sounds
        • Low RF susceptibility
        • Selectable low-frequency response: flat, 6 or 18 dB/octave rolloff
        • 0 dB/10 dB lockable attenuator switch
        • Phantom powering (DIN 45 596 voltages of 12 to 48 Vdc)
        • Rugged steel construction for durability
        • Field-usable over wide range of temperature and humidity conditions
      • Specifications

        • Type: Condenser (electret bias)

        • Frequency Response: 20 to 20,000 Hz

        • Polar Pattern: Cardioid (unidirectional) response-uniform with frequency, symmetrical about axis

        • Output Impedance: Rated at 150 ohms (85 ohms actual)
          Recommended minimum load impedance: 800 ohms (May be used with loads as low as 150 ohms with reduced clipping level)

        • Output Configuration and Connector: Balanced, transformer-coupled output; male XLR connector

        • Sensitivity (at 1,000 Hz): Open Circuit Voltage: -45 dBV/Pascal (5.6 mV (1 Pascal = 94 dB SPL)

        • Clipping Level (at 1,000 Hz): 800 ohm Load:
          -4 dBV (0.63 V)
          150 ohm Load: -15 dBV (0.18 V)

        • Total Harmonic Distortion: Less than 0.5% (131 dB SPL at 250 Hz into 800 ohm load)

        • Maximum SPL (at 1,000 Hz):
          800 ohm load: 136 dB (attenuator at 0) 146 dB (attenuator at -10)
          150 ohm load: 128 dB (attenuator at 0) 138 dB (attenuator at -10)

        • Hum Pickup: -3 dB equivalent SPL in a 1 mOe field (60 Hz)

        • Self-Noise (equivalent sound pressure levels; measured with true rms voltmeter):
          16 dB typical, A-weighted
          19 dB typical, weighted per DIN 45 405

        • Signal-to-Noise Ratio: 78 dB (IEC 651)* at 94 dB SPL
          *S/N ratio is difference between 94 dB SPL and product's equivalent self noise (SPL A-weighted).

        • Overvoltage and Reverse Polarity Protection: Max. external voltage applied to pins 2 and 3 with respect to pin 1: +52 Vdc

        • Reverse polarity protection: 200 mA max. (diode-clamped)

        • Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3

        • Cartridge Capacitance: 54 pF

        • Low Frequency Response Switch Positions: Flat; -6 dB/octave below 100 Hz; -18 dB/octave below 80 Hz

        • Attenuator Switch Positions (Lockable): 0 or -10 dB

        • Power: Supply Voltage: 11 to 52 Vdc, positive, pins 2 and 3
          Current Drain: 1.2 mA max.

        • Environmental Conditions:

        • Storage: -29 degrees to 74 degrees C (-20 degrees to 165 degrees F)
        • Operating: -6.7 degrees to 49 degrees C (20 degrees to 120 degrees F)

        • Storage 0 to 95% relative humidity at room temperature (72 degrees to 80 degrees F, 22 degrees to 27 degrees C)

        • Case: Steel construction with vinyl metallic paint finish and stainless steel screens

        • Weight:
          Net: 230 grams (8 oz)
          Packaged: 740 grams (1 lb 10 oz)

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