MPA426 1/4-inch Free-field Microphone

    MPA426 is 1/4-inch free-field microphone developed by BSWA and suitable for measurement in free-field and semi free-field without reflection. It is prepolarized microphone without external polarization voltage, and equipped with built-in ICCP power supply preamplifier.

MPA426 is front-vent with a frequency range of 20 Hz ~ 20 kHz. The sensitivity and cost are lower than MPA416 and it is suitable for applications such as acoustic array, electroacoustic and common acoustic measurement.

BSWA can perform phase-matching of microphones before delivery for the users who have phase requirements. If the phase is not required when ordering, the microphone phase will not be tested and matched.

Each MPA426 is supplied with an individual calibration data chart including sensitivity, frequency response and so on.


1/4-inch free-field microphone

Sensitivity (@250 Hz): 35 mV/Pa (-29 dB re 1V/Pa)

Frequency response: 20 Hz ~ 20 kHz (±3 dB)

Dynamic range: 32 dBA ~ 130 dB

Polarization Voltage: 0V (prepolarized)

Pressure equalization: front-vented

Optional phase-matching

Built-in preamplifier with ICCP power supply



Low-cost microphone

Array applications such as near-field acoustic holography (NAH), beamforming, etc.

    ●Product quality inspection of production line


Sound Field Free-field
Diameter 1/4"
Class (IEC 61672) Class 1
Sensitivity@250 Hz (mV/Pa) (±3 dB) 35 (-29 dB re 1V/Pa)
Polarization Voltage 0 V (prepolarized)
Frequency Response (Hz) 20 ~ 20 k (±3 dB)
Dynamic Range (dBA ~ dB) 32 ~ 130
Self-generated Noise (dBA) 32
Maximum Sound Pressure Level (dB) 130 (3% distortion)

100 Hz ~ 1 kHz: ±3°

3 kHz ~ 5 kHz: ±5°

5 kHz ~ 10 kHz: ±10°

Pressure Equalization Vent Front-vented
Preamplifier Built-in
Maximum Output Voltage (Vpeak) 2 ±3.16
Output Impendence (Ω) <110
Power Supply ICCP (2mA ~ 20mA,4mA typical)
Operating Temperature Range (°C) -10 ~ 50
Operating Humidity Range (%RH) 0 ~ 90
Dimension (mm) Ø7 × 61
Output Connector SMB
Weight (g) 8.6

 Note 1: phase-matching is only performing for the microphone ordered with phase requirements.

 Note 2: guaranteed by the circuit design, the actual maximum output voltage is determined by the sensitivity and the maximum sound pressure level.

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