BETA 181-O

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BETA 181 Specification

 

 

Cartridge Type                                                                                              Electret Condenser

 

 

Polar Pattern                                                                          Cardioid / Supercardioid / Omnidirectional / Bidirectional

 

Frequency Response                                                                                    20 to 20,000 Hz

 

 

Output Impedance                                                                                          110 Ω

 

Maximum SPL                                                                                               Cardioid: 149.0 dB SPL

(1 kHz at 1% THD, 1kΩ load)                                                                           Supercardoid: 152.0 dB SPL

Omnidirectional 154.0 dB SPL

Bidirectional 153.5 dB SPL

 

 

Signal-to-Noise Ratio                                                                                   Cardioid: 73.5 dB

(referenced at 94 dB SPL at 1 kHz;                                                                 Supercardoid: 72.5 dB

S/N ratio is difference between 94 dB SPL and                                                                     Omnidirectional 70.5 dB

equivalent SPL of self noise, A-weighted                                                      Bidirectional 71.0 dB

 

 

 

 

Dynamic Range                                                                                            Cardioid: 128.5 dB

(at 1 kHz, 1 kΩ load)                                                                                        Supercardoid: 129.5 dB

Omnidirectional 130.5 dB

Bidirectional 130.5 dB

 

 

 

Clipping Level                                                                                                7.5 dBV (2.4 V)

 

(1 kHz at 0.25% THD, 1kΩ load)

 

 

 

Self-Noise                                                                                                      Cardioid: 20.5 dB

(equivalent SPL, A-weighted, typical)                                                            Supercardoid: 22.5 dB

Omnidirectional 23.5 dB

Bidirectional 23.0 dB

 

 

 

 

Common Mode Rejection                                                                             ≥55 dB

(2020,000 Hz)

 

 

 

 

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

 

 

 

 

Power Requirements                                                                                    11–52 VDC phantom power (IEC-61938), 1.2 mA

 

 

 

Weight Net:                                                                                                    145 g (5.1 oz.)