Beta 181/C Cardioid Microphone/Performance Characteristics:Exceptional low-frequency reproduction/Extremely high SPL handling/High output level/No crossover distortion/Transformer output/Cartridge Type:Electret Condenser/Polar Pattern 181/C :Cardioid/Frequency Response:20 to 20,000 Hz/Output Impedance:110 Ω/Sensitivity: open circuit voltage, @ 1 kHz, typical/Cardioid: –46.5 dBV/Pa[1] (4.7 mV)/Maximum SPL:1 kHz at 1% THD[2]2500 Ω load :Cardioid :151.5 dB SPL/1000 Ω load: Cardioid :149.0 dB SPL/Signal-to-Noise Ratio[3]:Cardioid :73.5 dB/Dynamic Range:2500 Ω load: Cardioid :131.0 dB/1000 Ω load:Cardioid: 128.5 dB/Clipping Level:@ 1 kHz, 1% THD/2500 Ω load :10.5 dBV/1000 Ω load :7.5 dBV/Self Noise:equivalent SPL, A-weighted, typical/Cardioid : 20.5 dB SPL-A/Polarity:Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3/Power Requirements:11–52 V DC[4] phantom power (IEC-61938) 2.4 mA, maximum/Net Weight:145 g (5.1 oz.).[1] 1 Pa=94 dB SPL.[2]THD of microphone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL.[3]S/N ratio is the difference between 94 dB SPL and equivalent SPL of self noise, A-weighted.[4]All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower voltages, but with slightly decreased headroom and sensitivity.

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