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BETA 54 Specification


Cartridge Type Condenser (electret bias)
Frequency Response 20 to 20,000 Hz
Polar Pattern Supercardioid
Self-Noise 43.1 dB SPL(A-Weighted)
Signal-to-Noise Ratio 55 dB at 94 dB SPL
Recommended Minimum Input Impedance >1 kΩ
Preamp Output Impedance 136 Ω
Sensitivityopen circuit, ref. 1v/Pa at 1 kHz -56.0 dBV/Pa (2.51 mV)
Maximum Sound Pressure Level 141.4 dB SPL at 1% THD/1 kΩ load
Dynamic Range 110 dB (max. SPL with 1k load, minus typical A-wt. noise)
Current Drain 4.6 mA (preamp and microphone)
Output Polarity Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 at the output

connector of the preamp

Power Requirements Phantom power; 11 to 52 Vdc positive

on pins 2 and 3, return on pin 1 (ground)

Net Weight 135.35 g (4.75 oz.)

microphone and in-line preamp

Cable 1.5 m (5 ft.), small-diameter, shielded, with mini 4-pin connector (TA4F)