Shure BETA27 Bedienungsanleitung

BETA27

Instrument Microphone

The Shure supercardioid condenser microphone, BETA27, user guide.

Version: 3.1 (2023-I)

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Table of Contents

BETA27 Instrument Microphone 3

General Description 3

Features 3

Performance Characteristics 3

Applications 3

Avoiding Pickup of Unwanted Sound Sources 4

Stand Adapter 4

Positioning the Microphone 4

Selecting Low-Frequency Response 5

Setting Attenuation 5

Integral Pop Filter 6

Load Impedance 6

Power Requirements 6

Specifications 6

Accessories 9

Furnished Accessories 9

Optional Accessories 9

Certifications 9

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•

BETA27 

Instrument Microphone

General Description

The Shure Beta27isastudio-grade,side-addresscondensermicrophoneforprofessionalsoundreinforcement.Itsflatfre-

quency response, low self noise, and superior construction quality provide unerring precision in demanding performance and

recordingenvironments.Atightsupercardioidpatternensureshighgainbeforefeedback,maximumsoundisolation,andcon-

sistent off-axis rejection.

Features

Supercardioid polar pattern targets intended sound source with minimized bleed from off axis sound sources

1inch,externallybiased,ultra-thin,2.5μm,24Karatgold-layered,lowmass,Mylar diaphragmprovidessuperiortran-

sient response

Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response, no crossover distortion,

and minimal harmonic and intermodulation distortions

Premium electronic components and gold-plated internal and external connectors

Subsonic filter eliminates rumble from mechanical vibration below 17Hz

Switchable 15dB pad for handling extremely high sound pressure levels (SPLs)

Three-position low-frequency filter switch reduces unwanted background noise or counteracts proximity effect

Integrated three-stage "pop" protection grille reduces plosives and other breath noise

Internal shock mount reduces handling and stand noise

Performance Characteristics

Low self-noise

Consistent, highly directional polar response

Exceptional low-frequency reproduction

Extremely high SPL handling

High output level

Extended frequency response

No crossover distortion

Applications

Electric guitar and bass amplifiers

Brass and woodwind instruments

Orchestras, choirs, and wind ensembles

Overhead miking of drums and percussion instruments

Close-miking of acoustic instruments such as piano, guitar, violins, drums, and percussion

Low-frequency instruments such as double bass and kick drum

Vocals and speech

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Note: Location and room acoustics strongly affect the sound quality of microphones. To achieve the best overall sound for

a particular application, it may be necessary to experiment with microphone placement and room treatments.

Avoiding Pickup of Unwanted Sound Sources

Asupercardioidmicrophonehasthegreatestsoundrejectionatpoints120°towardtherearofthemicrophone.Placethemi-

crophone so that unwanted sound sources, such as monitors and loudspeakers, are at these angles, not directly behind it. To

minimizefeedbackandensureoptimumrejectionofunwantedsound,alwaystestmicrophoneplacementbeforeaperfor-

mance.

Recommended Loudspeaker Locations for Supercardioid Microphones

Stand Adapter

Thread the supplied stand adapter onto a floor or boom stand, then thread the microphone onto the adapter.

NOTE: To reduce low-frequency vibrations transmitted through the stand, use an isolating shock mount. Visit www.shure.com

for more information.

Positioning the Microphone

The front of the microphone is marked by the Shure logo. Position this side toward the sound source.

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Selecting Low-Frequency Response

A three-position switch on the back of the microphone lets you adjust the low-frequency response. Use the low-frequency filter

to reduce wind noise, room noise, or proximity effect.

Flat response. Provides the most natural sound in most applications.

Low frequency cutoff. Provides an 18dB-per-octave cutoff at 80Hz. Helps eliminate floor rumble and low-frequency room

noise from heating and air conditioning systems. This setting may also be used to compensate for proximity effect or to reduce

low frequencies that make an instrument sound dull or muddy.

Low frequency rolloff.Providesa6dB-per-octaverollofffilterat115Hz.Usethistocompensateforproximityeffectortore-

duce low frequencies that could make an instrument sound dull or muddy.

Setting Attenuation

The attenuation switch lets you reduce the signal level without altering the frequency response. This can prevent extremely

loud sounds from overloading the microphone.

0dB For "quiet" to "normal" sound levels.

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-15dB For use with extremely loud sound sources such as drums, horns, or loud guitar cabinets.

Integral Pop Filter

The microphone grille consists of 3 separate mesh layers that act as an integral pop filter. This helps reduce wind and breath

noise.Dependingontheperformer,anexternalpop-protectionscreenorwindscreenmaybenecessarywhenclose-mikingvo-

calists.

Load Impedance

Maximum SPL capability, output clipping level, and dynamic range vary with the input load impedance of the preamplifier to

whichyouconnectthemicrophone.Shurerecommendsaminimuminputloadimpedanceof1000Ω.Mostmodernmicrophone

preamplifiers meet this requirement. Higher impedance results in better performance for these specifications.

Power Requirements

This microphone requires phantom power and performs best with a 48 Vdc supply (IEC-61938). However, it will operate with

slightly decreased headroom and sensitivity with supplies as low as 11 Vdc.

Most modern mixers provide phantom power. You must use a balanced microphone cable: XLR-to-XLR.

Specifications

Type

Condenser (externally biased)

Frequency Response

20to20,000Hz

Polar Pattern

Supercardioid

Output Impedance

160Ω

Sensitivity

(at 1 kHz, open circuit voltage, Typical)

-37dBV/Pa[1](14.1mV)

Maximum SPL

(1 kHz at 1% THD)

PAD ON 1000Ωload 148dBSPL

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2500 Ω load 154dBSPL

PAD OFF

1000Ωload 134dBSPL

2500 Ω load 140dBSPL

Signal-To-Noise Ratio

(Ref. 94 dB SPL at 1 kHz)

86dB[2]

Dynamic Range

(at 1 kHz)

1000 Ω load 126dB

2500 Ω load 132dB

Common Mode Rejection

(10 Hz to 10 kHz)

>50dB

Clipping Level

(20 Hz to 20 kHz, at 1% THD)

1000 Ω load 2.0dBV

2500 Ω load 8.5dBV[3]

Attenuator Switch

0, -15dB

Low-Frequency Filter Switch

Flat,–6dB/octavebelow115Hz,or–18dB/octavebelow80Hz

Self Noise

(typical, equivalent SPL, A-weighted)

8.5dBSPL-A

Polarity

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

Weight

428g(15oz..)

Connector

Three-pin professional audio (XLR), male, balanced

Power Requirements

11to52VDC[4]phantompower,6mA

[1] 1 Pa=94 dB SPL

[2] S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted

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[3] THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified

SPL.

[4] All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower

voltages, but with slightly decreased headroom and sensitivity.

Typical Frequency Response

Typical Polar Pattern

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Overall Dimensions

Accessories

Furnished Accessories

Black Mount/Swivel Adapter for BETA27, KSM27, KSM32 and KSM44 A32M

Padded, Zippered Carrying Bag for BETA27, SM27 A27ZB

Optional Accessories

Black Foam Windscreen for BETA27, KSM27, KSM32, KSM42, KSM44, KSM44A,

PG27, PG42 and SM27 A32WS

Popper Stopper Pop Filter with Metal Gooseneck and Microphone Stand Clamp PS-6

ShureLock Rubber Isolated Shock Mount A27SM

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Certifications

CE Notice

Hereby,ShureIncorporateddeclaresthatthisproductwithCEMarkinghasbeendeterminedtobeincompliancewithEuro-

pean Union requirements.

The full text of the EU declaration of conformity is available at the following site: https://www.shure.com/en-EU/support/declara-

tions-of-conformity.

UKCA Notice

Hereby,ShureIncorporateddeclaresthatthisproductwithUKCAMarkinghasbeendeterminedtobeincompliancewithUK-

CA requirements.

The full text of the UK declaration of conformity is available at the following site: https://www.shure.com/en-GB/support/declara-

tions-of-conformity.

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