Shure SM27 Fascicule
SM27 Cardioid Condenser Microphone
SM27
Type
Condenser (externally biased)
Frequency Response
20 to 20,000 Hz
Polar Pattern
Cardioid
Impedance
150 Ω (140 Ω actual)
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: 133 dB (147 dB, Pad on)
2500 Ω load: 138 dB (152 dB, Pad on)
Signal-to-Noise Ratio
(referenced at 94 dB SPL at 1 kHz)
84.5 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: 123 dB
2500 Ω load: 128 dB
Common Mode Rejection
(20 Hz to 20 kHz)
> 50 dB
Clipping Level
(20Hz-20 kHz at 1% THD)
1000 Ω load: 1 dBV
2500 Ω load: 7 dBV
THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL
Self Noise
(typical, equivalent SPL, A-weighted)
9.5 dB
Polarity
Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Weight
Net: 642 g (22.6 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, 5.4 mA
Product Specifications
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Overview
Features
Specifications
The SM27 is a rugged and versatile large-diaphragm, side-address cardioid condenser microphone, with low self-noise and extended frequency
response that picks up vocal and instrument nuances with clarity. Durable Shure construction features three separate mesh layers that reduce wind
and breath noise. Equally comfortable on stage or in the studio.
response that picks up vocal and instrument nuances with clarity. Durable Shure construction features three separate mesh layers that reduce wind
and breath noise. Equally comfortable on stage or in the studio.
Cardioid polar pattern—the most commonly used pattern for both studio and live applications
•
1 inch, externally biased, ultra-thin, 2.5 μm, 24 Karat gold-layered, low mass, Mylar® diaphragm provides superior transient response
•
Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response and no crossover distortion, while minimizing
•
harmonic and intermodulation distortions
Premium electronic components and gold-plated internal and external connectors
Premium electronic components and gold-plated internal and external connectors
•
Subsonic filter eliminates rumble from mechanical vibration below 17 Hz
•
Switchable 15 dB pad for handling extremely high sound pressure levels (SPLs)
•
3-position switchable low-frequency filter helps reduce unwanted background noise or counteract proximity effect
•
Integrated three-stage “pop” protection grille reduces plosives and other breath noise
•
Internal shock mount reduces handling and stand noise
•
Polar Pattern
Frequency Response
Available Models
Optional Accessories and Replacement Parts
SM27
Includes Stand Adapter and Zippered Pouch
A27SM
ShureLock™ Rubber Isolated Shock Mount
A322B
Zippered Pouch
A32WS
Windscreen
RPM642
Replacement Rubber Rings for Shock Mount (contains four)
PS6
Popper Stopper ™
180°
150°
120°
90°
60°
30°
150°
120°
90°
60°
30°
–20 dB
–15 dB
–10 dB
–15 dB
–10 dB
–5 dB
+5 dB
180°
150°
120°
90°
60°
30°
150°
120°
90°
60°
30°
–20 dB
–15 dB
–10 dB
–15 dB
–10 dB
–5 dB
+5 dB
250 Hz
500 Hz
1000 Hz
10000 Hz
6400 Hz
2500 Hz
60 cm
20
20000
1000
10000
50
100
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2
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+10
0
–10
Hz
dB
2
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