Shure Beta 87 A

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Specifications

The Shure Model BETA 87A is a premium quality supercardioid
hand-held electret condenser vocal microphone with exceptionally
smooth frequency response and high sound pressure
level (SPL) capability. Used for professional sound reinforcement,
broadcasting, and studio recording applications, the
BETA 87A combines superb performance with the ruggedness
needed for touring and field production.
The BETA 87A features a controlled low-frequency roll-off that compensates for proximity effect and prevents the “boomy”
sound often associated with close pick-up. The characteristic
Shure presence rise brightens the upper midrange. The tight supercardioid
pattern, with null points at approximately 125°, provides
maximum isolation from other vocalists or instruments
while offering minimal off-axis coloration. The BETA 87A operates
on phantom power.

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Tech Sheet

FEATURES

Smooth frequency response with gradual presence rise

Highly consistent supercardioid polar pattern provides
superior gain-before-feedback

Electronic low-frequency roll-off compensates for proximity
effect

Wide dynamic range (117 dB) and low distortion characteristics

Very low susceptibility to RFI and electromagnetic hum

Advanced cartridge shock-mount system absorbs mechanical
shocks and reduces handling noise

Built-in pop filter reduces undesirable wind and breath
sounds

Reliability for years of trouble-free performance
SPECIFICATIONS
Cartridge Type
Condenser (electret bias)
Frequency Response
50 to 20,000 Hz
TYPICAL POLAR PATTERN
Model Beta 87A Condenser Microhpone
Output Impedance
Rated at 150 ohms (100 ohms actual ±20%)
Recommended minimum load impedance: 800 ohms
Sensitivity (at 1,000 Hz)
Open Circuit Voltage . –52.5 dBV/Pa (2 mV)
(1 Pa = 94 dB SPL)
Clipping Level (at 1,000 Hz)
1000 ohm Load .  –6 dBV (0.5 V)
Maximum SPL (at 1,000 Hz)
140.5 dB (0.25% THD, 1000 ohm load)
Self-Noise (equivalent sound pressure level; measured with true
rms voltmeter)
23.5 dB typical, A-weighted
25.5 dB typical, weighted per DIN 45 405
Dynamic Range
117 dB (maximum SPL to A-weighted noise level)
Signal-to-Noise Ratio
70.5 dB at 94 dB SPL (IEC 651)*
Polarity
Positive pressure on diaphragm produces positive voltage on pin
Power
Phantom Supply Requirement .  11 to 52 Vdc, positive
Current Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 to 1.2 mA
Connector
Three–pin (XLR) professional audio
Case
Aluminum construction with blue metallic finish, and hardened
steel grille with nickel satin chrome plating
Net Weight
207 grams (7.6 oz)
Dimensions
21 mm
(53/64 in.)
51 mm
(2 in.)
192 mm
(7–9/16 in.)
FURNISHED ACCESSORIES
Swivel Adapter .  A25D Carrying/Storage Bag .  26A13
REPLACEMENT PARTS
Grille .  RK312
Cartridge .  R193
Replacement Amplifier Assembly .90KF2600
OPTIONAL ACCESSORIES
Phantom Power Supply .  PS1A
Isolation Mount .  A53M, A53HM
Windscreen . A85WS
Cable (7.6 m—25 ft) .  C25F