Farralane.com - Shure BETA 27 Instrument Microphone

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.

Supercardioid polar pattern specifically targets the sound source consistently with greatly minimized bleed from off-axis sound sources
Tailored for superior transient response from a low-mass, 1” externally-biased, ultra-thin 24 Karat gold-layered Mylar® diaphragm
Flat, neutral frequency response for natural reproduction on stage or in the studio
3-position switchable low-frequency filter helps reduce unwanted background noise or counteract proximity effect for consistent, extended lowend

Specifications Sheet (PDF)

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