SM81-LC SM Series Condenser Instrument Microphone

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SM Series Condenser Instrument Microphone
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Shure Incorporated
Mac & Win
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Availability: In stock

The SM81’s flat 20-20k response makes it supremely accurate in its reproduction of audio sources. A 3-position bass roll-off switch reduces low-end energy, thus suiting the 81 to any acoustic environment. Additional features include a 10dB attenuator, cardioid pattern, and replaceable condenser capsule. Excellent for acoustic guitar/bass, cymbals, live recording, piano, orchestra, strings, sampling, woodwinds, and stereo pickup.

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


Electret Condenser

Frequency Response

20 to 20,000 Hz

Polar Pattern


Output Impedance

EIA rated at 150   (85   actual)


at 1 kHz, open circuit voltage

-45 dBV/Pa[1] (5.6 mV)

Maximum SPL

1 kHz at 1% THD, 1 k load

136 dB SPL

Signal-To-Noise Ratio

Ref. 94 dB SPL at 1 kHz

78 dB[2]

Clipping Level

1 kHz at 0.25% THD, 1 k load

-4 dBV (0.63 V)

Hum Pickup

typical, at 60 Hz, equivalent SPL/mOe

-3 dB


Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3


Net0.230 kg (0.5 lbs)
Packaged0.740 kg (1.625 lbs)

Attenuator Switch

0 or 10 dB, lockable


Three-pin professional audio (XLR), male


Steel construction with vinyl metallic paint finish and stainless steel screens

Environmental Conditions

Operating Temperature-6.7 to 49 C (20 to 120 F)
Storage Temperature-29 to 74 C (-20 to 165 F)
Relative Humidity0 to 95%

Power Requirements

11 to 52 V DC phantom power (1.2  mA)

[1] 1 Pa=94 dB SPL

[2] S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted

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