The Shure SM81-LC is a Condenser Instrument Microphone that 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.

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