Mic Archive
Shure SM27
Photo: Shure, from its user guide, p. 1.

Shure

Shure SM27

Large-diaphragm (1 inch) side-address cardioid condenser, externally biased, with a 15 dB pad and a three-position low-frequency filter

Type
Condenser
Pattern
Cardioid
Sensitivity
−37 dBV/Pa
Self-noise
9.5 dB(A)
Max SPL
138 dB SPL
Impedance
150 Ω
Rated range
20 – 20k Hz

Frequency response

Angle
Distance

Frequency response: from the user guide, p. 15. "Typical Frequency Response", marked "60 cm"; relative dB. Room and smoothing not stated; low-frequency filter flat (the other positions are not graphed).

Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.

Polar pattern

Polar pattern: from the user guide, p. 15. "Typical Polar Patterns"; two circles (250 Hz to 1 kHz, 2500 Hz to 10 kHz), 0° at the bottom, 5 dB per ring. Distance and room not stated.

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All specs

From the user guide
Capsule1 inch, externally biased, 2.5 µm, 24-karat gold-layered Mylar diaphragmp. 3
Sensitivity−37 dBV/Pa, 1 kHz, open circuit voltagep. 4
Self-noise9.5 dB(A), typical, equivalent SPL, A-weighted
Max SPL138 dB SPL, 1 kHz at 1% THD, 2500 ohm load, pad off; also 133 dB SPL, 1000 ohm load, pad off; also 152 dB SPL, 2500 ohm load, pad on; also 147 dB SPL, 1000 ohm load, pad on. "1000 Ω load: 133 dB (147 dB, Pad on); 2500 Ω load: 138 dB (152 dB, Pad on)".
Signal-to-noise ratio84.5 dB, referenced at 94 dB SPL at 1 kHz, A-weighted
Dynamic range128 dB, 1 kHz, 2500 ohm load; also 123 dB, 1000 ohm load
Output impedance150 ohm, rated; 140 ohm actual. "150 Ω (140 Ω actual)".
Rated frequency range20 Hz to 20 kHz
Poweringphantom, 48 V DC. "48 Vdc phantom, 5.4 mA"; page 3: it works down to 11 V DC with slightly less headroom and sensitivity.
Current draw5.4 mA
Low cutflat, 6 dB/oct below 115 Hz, 18 dB/oct below 80 Hz. "Low Frequency Response: flat; -6 dB/octave below 115 Hz; -18 dB/octave below 80 Hz". Page 3 calls them a 6 dB/octave rolloff at 115 Hz and an 18 dB/octave cutoff at 80 Hz. Not graphed.
Pad−15 dB. "Attenuator: -15 dB".
ConnectorXLR-3 male. "Three-pin professional audio (XLR), male".
Weight642 g, net
Dimensions53 × 156.2 mm. Dimension drawing: "156,2 mm (6.15 in.)" long, "53,0 mm (2.09 in.)" across (diameter × length).p. 15
Supplied accessoriesA32M ShureLock swivel adapter; A32ZB padded zippered carrying bag. Furnished accessories. The 2014 SM range sheet (p. 3) says "Includes stand adapter and zippered pouch".p. 4
Common mode rejection> 50 dB, 20 Hz to 20 kHz
Clipping level1000 Ω load: 1 dBV; 2500 Ω load: 7 dBV (20 Hz to 20 kHz at 1% THD)
PolarityPositive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
PreamplifierClass A, discrete, transformerlessp. 3
Subsonic filterRemoves rumble from mechanical vibration below 17 Hz
GrilleThree separate mesh layers acting as an integral pop filter
Shock mountInternal shock mount
Recommended loadAt least 1000 Ω; higher load impedance gives more max SPL, clipping level and dynamic range
Optional accessoriesA27SM ShureLock rubber isolated shock mount; A32SC aluminium carrying case; A32WS windscreen; PS-6 Popper Stopper; RPM642 rubber rings for the shock mountp. 4

Documents

Copies kept by Mic Archive, because manufacturers move and drop their documents. Each is © Shure, unchanged, with its original address.

Product page on shure.comRecording Hacks

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