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Shure – SM81 Condenser Instrument Microphone

Shure

Cardioid condenser instrument microphone offers a wide frequency response and low self-noise. Features include flat response curve, low noise and high output clipping level, low distortion over a range of load impedances, and low RF susceptibility.

SKU: SHUSM81-LC Categories: , , , ,

Description

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 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.

Features

  • 20 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

In the Box

  • 1 – swivel adapter
  • 1 – attenuator-switch lock
  • 1 – foam windscreen

Video

Shure SM Microphones

SM Microphones are equal to the demands of high-energy performance, proven time and time again through decades of rigorous use by performers and engineers of all experience levels.

Additional information

Weight 0.23 kg
Type

Electret Condenser

Frequency Response

20 to 20,000 Hz

Polar Pattern

Cardioid

Output Impedance

EIA rated at 150 Ω (85 Ω actual)

Sensitivity

at 1 kHz, open circuit voltage -45 dBV/Pa[1] (5.6 mV)

Maximum SPL

1 kHz at 1% THD, 1 kΩ 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 kΩ load -4 dBV (0.63 V)

Hum Pickup

typical, at 60 Hz, equivalent SPL/mOe -3 dB

Polarity

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

Attenuator Switch

0 or −10 dB, lockable

Connector

Three-pin professional audio (XLR), male

Housing

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 Humidity 0 to 95%

Downloads

Spec Sheet Download
User Guide Download