SM Series Multi-Purpose Condenser Microphone

The SM27 is a rugged and versatile large-diaphragm, side-address cardioid condenser microphone. It has 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.

Type
Condenser (externally biased)

Frequency Response
20 to 20,000 Hz

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