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Beta 27 Supercardioid Condenser Microphone
Beta 27
Type Condenser (externally biased)
Frequency Response 20 to 20,000 Hz
Polar Pattern Supercardioid
Impedance 160 Ω
Sensitivity
(at 1 kHz, open circuit voltage)
−37 dBV/Pa
1 Pascal=94 dB SPL
Maximum SPL
(1 kHz at 1% THD)
1000 Ω load: 134 dB (148 dB, Pad on)
2500 Ω 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 Ω load: 125.5 dB
2500 Ω load: 131.5 dB
Common Mode Rejection
(20 Hz to 20 kHz)
> 50 dB
Clipping Level
(20Hz-20 kHz at 1% THD)
1000 Ω load: 2.0 dBV
2500 Ω 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
Product Specifications
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©2010 Shure Incorporated
Overview
Features
Specifications
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
insures 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 low-
end
• -15 dB switchable attenuator handles extremely high SPLs with ease
• Premium electronic components and gold-plated internal and external connectors
• Internal pop filter with three separate mesh layers reduces wind and breath noise.
Polar Pattern Frequency Response
Available Models
Accessories and Replacement Parts
Beta 27
Includes Stand Adapter and Padded Zippered Pouch
A32SM
ShureLock
®
Black Swivel Adapter
A27ZB
Zippered Pouch
A32WS
Windscreen
A27SM
ShureLock
®
Rubber Isolated Shock Mount
PS-6
Popper Stopper™
1 80°
1 50°
1 20°
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1 20°
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6 0°
3 0°
1 50°
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9 0°
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3 0°
–20 dB
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+5 dB
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1 000 Hz 1 0000 Hz
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2 500 Hz
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