Shure BETA91A Bedienungsanleitung

BETA91A

Half-Cardioid Condenser Microphone

The Shure half-cardioid electret condenser microphone, BETA91A, user guide.

Version: 3.1 (2021-B)

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Table of Contents

BETA91A Half-Cardioid Condenser Microphone 3

General Description 3

Features 3

Applications 3

General Rules for Use 3

Applications and Placement 3

Mounting the Microphone 4

Half-cardioid Polar Pattern 4

Contour Switch 4

Load Impedance 5

Power Requirements 5

Accessories 5

Furnished Accessories 5

Optional Accessories 6

Replacement Parts 6

Specifications 6

Certifications 8

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•

BETA91A 

Half-Cardioid Condenser Microphone

General Description

The Shure Beta 91A is designed for use with kick drums, piano and other traditional low frequency applications. Tailored for

bass-heavy environments, this microphone features a powerful low frequency response and integrated preamplifier and XLR

connection for easy setup and minimal stage clutter. The Beta 91A combines superior attack and punch for studio-quality

sound, even at extremely high sound pressure levels (SPLs).

Features

Premier live performance microphone with Shure quality, ruggedness, and reliability

Uniformhalf-cardioidpolarpattern(inthehemisphereabovemountingsurface)formaximumgainbeforefeedbackandre-

jection of off-axis sound

Tailored frequency response for kick drums and bass-heavy instruments

Wide dynamic range for use in high SPL environments

Two-position contour switch enhances attack and clarity

Integrated preamp and XLR connector reduce stage clutter and provide a quick, secure setup

Low profile design requires no external mounting hardware

Steel grille and die-cast metal construction resist wear and abuse

Applications

General Rules for Use

This table lists the most common applications and placement techniques. Keep in mind that microphone technique is largely a

matter of personal taste; there is no one "correct" microphone position.

Aim the microphone toward the desired sound source; angle unwanted sounds toward its null point.

Use the fewest amount of microphones as practical to increase the Potential Acoustic Gain and prevent feedback.

Follow the 3 to 1 Rule by spacing each microphone by at least three times the distance to its source to reduce Phase Can

cellation.

Place microphones as far as possible from reflective surfaces to reduce Comb Filtering.

When using directional microphones, work closely to the microphone for extra bass response to take advantage of Prox

imity Effect.

Avoid excessive handling to minimize pickup of mechanical noise and vibration.

Do not cover any part of the microphone grille, as this will adversely affect microphone performance.

Applications and Placement

Locationandroomacousticsstronglyaffectthesoundqualityofmicrophones.Toachievethebestoverallsoundforaparticu-

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

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Application Suggested Microphone Placement Tone Quality

Kick Drum

Inside drum, on a pillow or other cushioning surface, 25

to 152 mm (1 to 6 in.) from beater head. Full, natural sound.

Contour switch activated; 25 to 152 mm (1 to 6 in.)

from beater head.

Sharp attack; maximum bass

“punch.”

Piano

Mount microphone on underside of lid over lower treble

strings. Experiment with lid height and placement to

hammers for desired sound.

Bright, well-balanced, strong attack;

excellent isolation.

Mount microphone vertically on the inside of the pi-

ano frame, near the apex of the piano’s curved wall.

Full, natural; excellent isolation and

minimal hammer and damper noise.

Mounting the Microphone

If desired, attach the microphone to a prepared surface using the mounting holes on the bottom of the microphone.

Half-cardioid Polar Pattern

This boundary microphone has a cardioid polar pattern in the hemisphere above the mounting surface. Keep sound sources

within a 60° range above this surface.

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Contour Switch

Atwo-positionswitchonthebottomofthemicrophoneletsyouselectivelyfilterthelow-midfrequencyresponsewithoutaddi-

tional tools. Use this filter to enhance the attack and clarity of bass-heavy instruments.

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

Low-Mid Scoop:Thissettingtailorsthemicrophone’sfrequencyresponsetoprovideastrong‘punch’inthelowfrequencies,

and plenty of attack in the higher frequencies.

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.

Accessories

Furnished Accessories

Zippered Carrying Bag 95A2314

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Optional Accessories

25 foot (7.5m) Triple-Flex Microphone XLR Cable with Switchcraft connectors C25E

Replacement Parts

Cardioid Cartridge RPM98A/C

Specifications

Type

Electret Condenser

Frequency Response

20 to 20,000Hz

Polar Pattern

Half-cardioid (cardioid in hemisphere above mounting surface)

Output Impedance

150Ω

Sensitivity

at 1kHz,open circuit voltage

-48.5dBV/Pa(3.8mV)

Maximum SPL

1 kHz at 1% THD

2500 Ω load 155 dB

1000 Ω load 151 dB

Signal-To-Noise Ratio

64.5 dB

Dynamic Range

at 1kHz

2500 Ω load 125.5 dB

1000 Ω load 121.5 dB

Clipping Level

20 Hz to 20 kHz, at 1% THD

2500 Ω load 12.5 dB

1000 Ω load 7.5 dB

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Self Noise

equivalent SPL, A-weighted, typical

29.5 dBSPL-A

Common Mode Rejection

(20 Hz to 200 kHz)

≥55dB

Frequency Contour Switch

7 dB of attenuation centered at 400 Hz

Power Requirements

11–52 VDC phantom power , 5.4mA

Polarity

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

Weight

470g(16.6oz.)

Connector

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

1 Pa=94 dB SPL 1 Pa=94 dB SPL 1 Pa=94 dB SPL 1 Pa=94 dB SPL 1 Pa=94 dB SPL

THD of microphone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL THD of

microphone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL THDofmicro-

phone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL THDofmicrophonepre-

amplifier when applied input signal level is equivalent to cartridge output at specified SPL THD of microphone preamplifier

when applied input signal level is equivalent to cartridge output at specified SPL

S/N ratio is the difference between 94 dB SPL and equivalent SPL of self-noise, A-weighted S/Nratioisthedifferencebe-

tween 94 dB SPL and equivalent SPL of self-noise, A-weighted S/Nratioisthedifferencebetween94dBSPLandequiva-

lent SPL of self-noise, A-weighted S/Nratioisthedifferencebetween94dBSPLandequivalentSPLofself-noise,A-weight-

ed S/N ratio is the difference between 94 dB SPL and equivalent SPL of self-noise, A-weighted

All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower voltages, but with

slightly decreased headroom and sensitivity Allspecificationsmeasuredwitha48Vdcphantompowersupply.Themicro-

phone operates at lower voltages, but with slightly decreased headroom and sensitivity All specifications measured with a 48

Vdc phantom power supply. The microphone operates at lower voltages, but with slightly decreased headroom and sensitivity

All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower voltages, but with

slightly decreased headroom and sensitivity Allspecificationsmeasuredwitha48Vdcphantompowersupply.Themicro-

phone operates at lower voltages, but with slightly decreased headroom and sensitivity

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[1] [1] [1] [1] [1]

[2] [2]

[2]

[3] [3]

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Certifications

This product meets the Essential Requirements of all relevant European directives and is eligible for CE marking.

The CE Declaration of Conformity can be obtained from: www.shure.com/europe/compliance

Authorized European representative:

Shure Europe GmbH

Headquarters Europe, Middle East & Africa

Department: EMEA Approval

Jakob-Dieffenbacher-Str. 12

75031 Eppingen, Germany

Phone: +49-7262-92 49 0

Fax: +49-7262-92 49 11 4

Email: [email protected]

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