BETA87CVocal Microphone General Description

The Shure Beta 87C vocal microphone is precision-engineered to deliver an extremely smooth, extended high-end frequency response in a cardioid condenser design. The warm, natural sound creates an ideal environment for personal monitoring with excellent rear rejection.

An advanced, cartridge shock mount system, hardened steel-mesh grille, and superior build quality withstand the rigors of daily touring and sound reinforcement.

Features

• Premier live performance microphone with Shure quality, ruggedness, and reliability
• Uniform cardioid pick-up pattern for maximum gain before feedback and excellent rejection of off-axis sound
• Smooth, wide frequency response with slight presence rise and controlled proximity effect tailored for vocals
• Advanced cartridge shock mount system absorbs mechanical shock and minimizes handling noise
• Very low susceptibility to RF and electromagnetic hum
• Dent-resistant steel mesh grille and enamel coated metal alloy construction resist wear and abuse
• Effective built-in pop filter reduces undesirable wind and breath noise

Applications General Rules for Use

• Do not cover any part of the microphone grille with your hand, as this will adversely affect microphone performance.
• Aim the microphone toward the desired sound source (such as the talker, singer, or instrument) and away from unwanted sources.
• Place the microphone as close as practical to the desired sound source.
• Work close to the microphone for extra bass response.
• Use only one microphone to pick up a single sound source.
• For better gain before feedback, use fewer microphones.
• Keep the distance between microphones at least three times the distance from each microphone to its source (“three to one rule”).
• Place microphones as far as possible from reflective surfaces.
• Add a windscreen when using the microphone outdoors.
• Avoid excessive handling to minimize pickup of mechanical noise and vibration.

Applications And Placement

The following 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.

Application Suggested Microphone Placement Tone Quality Vocals Lips less than 15 cm (6 in.) away or touching the windscreen, on axis to microphone. Robust sound, emphasized bass, maximum isolation from other sources. 15 to 60 cm (6 in. to 2 ft.) away from mouth, just above nose height. Natural sound, reduced bass. 20 to 60 cm (8 in. to 2 ft.) away from mouth, slightly off to one side. Natural sound, reduced bass and minimal “s” sounds. 90 cm to 1.8 m (3 to 6 ft.) away. Thinner, distant sound; noticeable levels of ambient noise. Avoiding Pickup of Unwanted Sound Sources

Place the microphone so that unwanted sound sources, such as monitors and loudspeakers, are directly behind it. To minimize feedback and ensure optimum rejection of unwanted sound, always test microphone placement before a performance.

Recommended Loudspeaker Locations for Cardioid Microphones

Proximity Effect

Unidirectional (cardioid) microphones progressively boost bass frequencies by 6 to 10 dB below 100 Hz when the microphone is at a distance of about 6 mm (1/4 in.) from the sound source. This phenomenon, known as proximity effect, can be used to create a warmer, more powerful sound. To prevent explosive low frequency sound during close-up use, the bass response gradually rolls off. This provides greater control and helps the user take advantage of proximity effect.

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 or XLR-to-TRS.

Specifications  Type

Electret Condenser

Frequency Response

50 to 16,000 Hz

Polar Pattern

Cardioid

Output Impedance

EIA rated at150  Ω(100  Ωactual)

Sensitivity

at 1kHz,open circuit voltage

-51  dBV/Pa(2  mV)[1]

Maximum SPL

1 kHz at 1% THD,1 kΩ load

139  dB

Signal-to-Noise Ratio

70.5 dB[2]

Dynamic Range

at 1kHz,1 kΩ load

117 dB

Clipping Level

1 kHz at 0.25% THD,1 kΩ load

-6 dBV(0.5 V)

Self Noise

typical,equivalent SPL,A-weighted

22  dB

Hum Pickup

typical, at 60 Hz, equivalent SPL/mOe

-5  dB

Polarity

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

Weight Packaged 0.565 kg(1.24 lbs) Net 0.207 kg(0.475 lbs) Connector

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

Housing

Aluminum construction with painted blue metallic finish, and hardened steel grille with nickel satin chrome plating

Power Requirements

11 to 52 V DCphantom power(1.2 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

Overall Dimensions

 

Typical Frequency Response

 

Typical Polar Pattern

 

BLOCK DIAGRAM

Accessories Furnished Accessories

Microphone Clip for SM58, SM57, SM87A, Beta 87A, Beta 87C, PGA57, PGA58, PGA48, PGA81

A25D

Zippered Carrying Bag

95A2314

Optional Accessories Shock Stopper® Isolation Mount

A55HM

Black Foam Windscreen for KSM8, SM85, SM86, SM87A, Beta 87A, and Beta 87C

A85WS

25 foot (7.5m) Triple-Flex® Microphone XLR Cable with chrome connectors

C25F

Replacement Parts

Grille for Wired and Wireless Beta87, Beta87A and Beta87C

RK312

Cartridge for BETA 87 and BETA 87A

R193

Plug (Connector) Assembly

90J1984

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