Micro dynamique SHURE BETA 91

Type

Electret Condenser

Frequency Response

20 to 20,000 Hz

Polar Pattern

Half-cardioid (cardioid in hemisphere above mounting surface) 

Impedance

146 Ohms

Sensitivity (at 1 kHz, open circuit voltage)

-48.5 dBV/Pa (3.8mV)

1 Pascal=94 dB SPL

Maximum SPL (1 kHz at 1% THD)

1000 Ohm load: 151 dB, 2500 Ohm load: 155 dB

Signal-to-Noise Ratio (referenced at 94 dB SPL at 1 kHz)

64 dB

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

Dynamic Range (at 1 kHz)

1000 Ohm load: 121.5 dB

2500 Ohm load: 125.5 dB

Common Mode Rejection (20 Hz to 20 kHz)

> 55 dB

Clipping Level (20Hz-20 kHz at 1% THD)

1000 Ohm load: 7.50 dBV, 2500 Ohm load: 12.5 dBV

THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL

Self Noise (typical, equivalent SPL, A-weighted)

29.5 dB SPL-A 

Polarity

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

Weight

Net: 470 g (16.6 oz.)

Frequency Contour Switch

7 dB of attenuation centered at 400 kHz