Product Introduction
The Shure SM81 Cardioid Condenser Instrument Microphone is a legendary standard in the industry, renowned for its flat frequency response, low self-noise, and exceptional durability. With its accurate sound reproduction and flexible features, the SM81 is the top choice for professional musicians and sound engineers when miking acoustic guitar, piano, cymbals, and orchestral instruments.
Its cardioid polar pattern provides excellent isolation of the main sound source with minimal coloration, while the switchable low-frequency roll-off and lockable 0 dB/–10 dB attenuator ensure versatility for different instruments and environments. Built with rugged steel construction, the SM81 withstands tough live stage conditions yet remains precise enough for studio use.
Key Features
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Flat frequency response (20 Hz – 20 kHz) for accurate sound reproduction
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Cardioid polar pattern provides excellent off-axis rejection and minimal coloration
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Low self-noise and high output clipping level for professional recording quality
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Lockable 0 dB/–10 dB attenuator switch for handling loud sources
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Selectable low-frequency roll-off (flat, 6 dB/octave, 18 dB/octave)
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Low RF susceptibility for interference-free operation
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Rugged steel body ensures reliability under demanding stage and studio conditions
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Wide operating range across varying temperatures and humidity
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Includes swivel adapter, attenuator-switch lock, and foam windscreen
� Technical Specifications
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Transducer Type: Condenser
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Polar Pattern: Cardioid
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Frequency Response: 20 Hz – 20 kHz (flat response)
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Sensitivity: –45 dBV/Pa (5.6 mV/Pa)
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Equivalent Self-Noise: 16 dB(A)
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Maximum SPL:
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800 Ω load: 136 dB (0 dB), 146 dB (–10 dB)
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150 Ω load: 128 dB (0 dB), 138 dB (–10 dB)
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Impedance: 85 Ω
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Low-Cut Filter: Yes (flat, 6 dB/oct, 18 dB/oct)
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Attenuator Pad: Yes (0 dB/–10 dB lockable)
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Connector: 3-pin XLR
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Phantom Power Requirement: 11–52 V DC
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Dimensions: 212 × 23.5 × 23.5 mm (8.34 × 0.92 × 0.92 in)
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Weight: 230 g (0.507 lbs)
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Accessories Included: Swivel adapter, attenuator-switch lock, foam windscreen
