Product Specifications - Shure SM27 User Manual

Product Specifications
SM27 Cardioid Condenser Microphone
Overview
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.
Features
• 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
• 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
Available Models
SM27 Includes Stand Adapter and Zippered Pouch
Specifications
Type Condenser (externally biased)
Frequency Response 20 to 20,000 Hz
Polar Pattern Cardioid
Impedance 150 Ω (140 Ω actual)
Sensitivity −37 dBV/Pa
(at 1 kHz, open circuit voltage) 1 Pascal=94 dB SPL
Maximum SPL 1000 Ω load: 133 dB (147 dB, Pad on)
2500 Ω load: 138 dB (152 dB, Pad on)
(1 kHz at 1% THD)
Signal-to-Noise Ratio 84.5 dB
(referenced at 94 dB SPL at 1 kHz) S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted
Dynamic Range 1000 Ω load: 123 dB
2500 Ω load: 128 dB
(at 1 kHz)
Common Mode Rejection
> 50 dB
(20 Hz to 20 kHz)
1000 Ω load: 1 dBV
Clipping Level
2500 Ω load: 7 dBV
(20Hz-20 kHz at 1% THD)
THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL
Self Noise
9.5 dB
(typical, equivalent SPL, A-weighted)
Polarity Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Weight Net: 642 g (22.6 oz.)
Attenuator: -15 dB
Switch
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
Optional Accessories and Replacement Parts
A27SM ShureLock™ Rubber Isolated Shock Mount
RPM642 Replacement Rubber Rings for Shock Mount (contains four)
Polar pattern
180°
150° 150°
120° 120°
90° 90°
–20 dB
–15 dB
–10 dB
60° 60°
–5 dB
30° 30°
+5 dB
250 Hz
500 Hz
1000 Hz
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A322B Zippered Pouch
PS6 Popper Stopper ™
180°
150° 150°
120° 120°
90° 90°
–20 dB
–15 dB
–10 dB
60° 60°
–5 dB
30° 30°
+5 dB
2500 Hz
6400 Hz
10000 Hz
A32WS Windscreen
Frequency response
+10
0
60 cm
–10
2 3 4
20 50 100
SM27
2
5 6 7 8 9 3 4 5 6 7 8 9
1000 10000 20000
Hz
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