Shure
Shure Beta 27
Side-address supercardioid condenser (externally biased, 1-inch diaphragm), transformerless, with a -15 dB pad and a three-position low-frequency filter; for instruments and stage
Power Phantom 11-52 V DC (IEC-61938); best at 48 V.
- Type
- Condenser
- Pattern
- Supercardioid
- Sensitivity
- −37 dBV/Pa
- Among 204 condensers: more output than 51%
- Among 311 mics: more output than 66%
- Self-noise
- 8.5 dB(A)
- Among 258 condensers: quieter than 89%
- Among 272 mics: quieter than 89%
- Max SPL
- 134 dB SPL
- Among 277 condensers: takes louder sound than 33%
- Among 343 mics: takes louder sound than 30%
- Rated range
- 20 – 20k Hz
- Released
- 2010
vs 75 side-address condensers
More output than 36% of 75 side-address condensers.
Each stripe is one side-address condenser with a published sensitivity, and each bar counts them; further right means more output. This mic is in blue.
vs 99 side-address condensers
Quieter than 77% of 99 side-address condensers.
Each stripe is one side-address condenser with a published self-noise, and each bar counts them; further right means quieter. This mic is in blue.
vs 107 side-address condensers
Takes louder sound than 36% of 107 side-address condensers.
Each stripe is one side-address condenser with a published max SPL, and each bar counts them; further right means it takes louder sound. This mic is in blue.
Proximity effect: the bass it gains up close
From the user guide (Recording Hacks copy), p. 15.
"61 cm (2 ft.) from sound source"; relative dB. Room and smoothing not stated.
Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.
Polar pattern
From the user guide (Recording Hacks copy), p. 15.
Polar pattern; two circles (250 Hz to 1 kHz, 2500 Hz to 10 kHz), 0° at the bottom, 5 dB per ring.
In practice
All specs
| From the user guide | ||
|---|---|---|
| Capsule | 1-inch, externally biased, ultra-thin 2.5 µm, 24-karat gold-layered, low-mass Mylar diaphragm | p. 3 |
| Sensitivity | −37 dBV/Pa (14.1 mV/Pa)at 1 kHz, open circuit voltage, typical. "-37 dBV/Pa (14.1 mV)". | p. 6 |
| Self-noise | 8.5 dB(A)typical, equivalent SPL, A-weighted. "8.5 dB SPL-A". | p. 7 |
| Max SPL | 134 dB SPL1 kHz at 1% THD, 1000 ohm load, pad off; also 140 dB SPL, 2500 ohm load, pad off; also 148 dB SPL, 1000 ohm load, pad on; also 154 dB SPL, 2500 ohm load, pad on. Pages 6-7. THD "of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL". | p. 6 |
| Signal-to-noise ratio | 86 dBref. 94 dB SPL at 1 kHz; also 85.5 dB, 2015 spec sheet | p. 7 |
| Dynamic range | 126 dBat 1 kHz, 1000 ohm load; also 132 dB, 2500 ohm load; also 125.5 dB, 2015 spec sheet, 1000 ohm load (131.5 dB into 2500 ohm) | |
| Output impedance | 160 ohmoutput impedance | p. 6 |
| Rated load impedance | 1000 ohmrecommended minimum. "Shure recommends a minimum input load impedance of 1000 Ω". | |
| Rated frequency range | 20 Hz to 20 kHz | |
| Powering | phantom 11-52 V DC (IEC-61938); best at 48 V"11 to 52 V DC phantom power, 6 mA"; all specifications measured at 48 V (p. 8). | p. 7 |
| Current draw | 6 mAalso 5.6 mA, 2015 spec sheet, "48 Vdc phantom" | |
| Low cut | flat, -6 dB/oct below 115 Hz, -18 dB/oct below 80 Hz"Low frequency cutoff. Provides an 18dB-per-octave cutoff at 80Hz"; "Low frequency rolloff. Provides a 6dB-per-octave rolloff filter at 115Hz". Graphed in the current guide (p. 8). | p. 5 |
| Pad | −15 dBAttenuation switch 0 / -15 dB. | |
| Connector | XLR-3 male"Three-pin professional audio (XLR), male, balanced". | p. 7 |
| Weight | 428 gnet. "428 g (15 oz.)"; 537 g with the stand mount (2010 guide, p. 4). | |
| Supplied accessories | A32M swivel stand adapter; A27ZB padded zippered carrying bagFurnished accessories. | p. 9 |
| Preamplifier | Class A, discrete, transformerless; gold-plated internal and external connectors | p. 3 |
| Subsonic filter | Eliminates rumble from mechanical vibration below 17 Hz | |
| Output clipping level | 2.0 dBV into 1000 ohm, 8.5 dBV into 2500 ohm (20 Hz to 20 kHz, 1% THD) | p. 7 |
| Common mode rejection | >50 dB (10 Hz to 10 kHz) | |
| Grille | Three separate mesh layers acting as an integral pop filter | p. 6 |
| Shock mount | Internal shock mount reduces handling and stand noise | p. 3 |
| Polarity | Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 | p. 7 |
| Optional accessories | A32WS foam windscreen; PS-6 Popper Stopper pop filter; A27SM ShureLock rubber isolated shock mount | p. 9 |
| PlacementShure | Front marked by the Shure logo; greatest rejection about 120° off axis, where monitors are best placed | p. 4 |
| From the Recording Hacks page | ||
| Released | 2010 | |
| From the user guide (Recording Hacks copy) | ||
| Dimensions | 156.2 × 55.88 mmDimension drawing: height 156.2 mm (6.15 in.) without the connector stub, width 55.88 mm (2.20 in.). | p. 15 |
Documents
- BETA27 Instrument Microphone, user guideVersion 3.1, 2023-I
- Beta 27 Supercardioid Condenser Microphone, Product Specifications
- BETA 27 Supercardioid Condenser Microphone, user guide27A13709 Rev. 1
- BETA 27 Instrument Microphoneshure.com en-GB product page
- Shure Beta 27 | RecordingHacks.com
Copies kept by Mic Archive (manufacturers move and drop their documents). Each is © Shure, unchanged, with its original address.