SM27-SC SM Series Multi-Purpose Condenser Microphone

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SM Series Multi-Purpose Condenser Microphone
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Shure Incorporated
Mac & Win
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Large diaphragm, side-address cardioid condenser microphone for stage and studio applications. Features a 3-position LF filter switch, low-mass Mylar® diaphragm, 3-layer mesh windscreen, and 15dB pad.

Flat, neutral frequency response for natural reproduction on stage or in the studio

15dB pad for performance consistency across a wider range of high SPL sources

Superior transient response from a low-mass large Mylar® diaphragm

Uniform cardioid pattern for superior off axis rejection

3-position switchable low-frequency filter helps reduce unwanted background noise or counteract proximity effect for consistent, extended low-end

Durable metal construction

Three separate mesh layers reduces wind and breath noise


Condenser (externally biased)


Frequency Response

20 to 20,000 Hz


Polar Pattern




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 SPLof 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 isequivalent to cartridge output at specified SPL


Self Noise (typical, equivalent SPL, A-weighted)

9.5 dB



Positive pressure on diaphragm produces positive voltage onpin 2 with respect to pin 3



Net: 642 g (22.6 oz.)



Attenuator: -15 dB

Low Frequency Response: flat; -6 dB/octave below 115 Hz; -18dB/octave below 80 Hz



Three-pin professional audio (XLR), male


Power Requirements

48 Vdc phantom, 5.4 mA

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