Shure SM27

Type
Condenser (externally biased)
Frequency Response
20 to 20,000 Hz
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Polar Pattern
Cardioid
Impedance
150 Ohms (140 Ohms actual)
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: 133 dB (147 dB, Pad on)
2500 Ohm 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 Ohm load: 123 dB
2500 Ohm load: 128 dB Common Mode Rejection (20 Hz to 20 kHz)
> 50 dB
Clipping Level (20Hz-20 kHz at 1% THD)
1000 Ohm load: 1 dBV
2500 Ohm 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