Shure Incorporated BETA Series Large-Diaphragm Side-Address Instrument Microphone BETA 27

The Beta 27 side-address condenser microphone is precision engineered for professional sound reinforcement and project studio recording applications. Its flat frequency response and low self-noise provide unerring performance in demanding environments. A tight supercardioid pattern ensures high gain-before-feedback and maximum isolation from other sound sources.
Type
Condenser (externally biased)
Frequency Response
20 to 20,000 Hz
Polar Pattern
Supercardioid
Impedance
160 Ohms
Sensitivity (at 1 kHz, open circuit voltage)
-37 dBV/Pa
1 Pascal=94 dB SPL
Maximum SPL (1 kHz at 1% THD)
1000 Ohm load: 134 dB (148 dB, Pad on)
2500 Ohm load: 140 dB (154 dB, Pad on)
Signal-to-Noise Ratio (referenced at 94 dB SPL at 1 kHz)
85.5 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: 125.5 dB
2500 Ohm load: 131.5 dB
Common Mode Rejection (20 Hz to 20 kHz)
> 50 dB
Clipping Level (20Hz-20 kHz at 1% THD)
1000 Ohm load: 2.0 dBV
2500 Ohm load: 8.5 dBV
THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL
Self Noise (typical, equivalent SPL, A-weighted)
8.5 dB
Polarity
Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Weight
Net: 428 g (15.1 oz.)
Switch
Attenuator: -15 dB
Low Frequency Response: flat; -6 dB/octave below 115 Hz; -18 dB/octave below 80 Hz
Connector
Three-pin professional audio (XLR), male
Power Requirements
48 Vdc phantom, 5.6 mA