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Specification Sheet
MODEL BETA 87A CONDENSER MICROPHONE
2
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
2 relative to pin 3
Power
Phantom Supply Requirement 11 to 52 Vdc, positive. . . . . . . . .
at both pins 2 and 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.)
DIMENSIONS
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. . . . . . . . . . . . . . . . . . . . . . . . . . .