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MPA436A 1/4-inch Free-field Microphone

MPA436A is the new 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 (optional TEDS).

MPA436A is front-vent and can measure the sound pressure level up to 140 dB in the frequency range of 20 Hz ~ 10 kHz (±2 dB) and 10 kHz ~ 20 kHz (±3 dB). Each MPA436A passed a high sound pressure test before leaving the factory to verify its total distortion ≤ 3% when the rated maximum sound pressure level is reached.

MPA436A is suitable for applications which need a large number of microphones with critical cost requirements, such as array applications including near-field acoustic holography (NAH), beamforming, etc. MPA436A can not only control the overall cost of the array, but also meet the basic requirements of sensitivity and phase-matching. Moreover, the optional TEDS function support data acquisition equipment to read microphone information directly, including microphone model, serial number, sensitivity, etc. BSWA microphone supports the IEEE 1451.4 standard. The v0.9 version is used by default to be compatible with more data acquisition equipment. The v1.0 version can also be selected according to user requirements.

Each MPA436A is supplied with an individual calibration data chart including sensitivity, frequency response and so on.

Product Features 

 ● 1/4-inch free-field microphone

 ● Sensitivity (@250 Hz): 11.2 mV/Pa (± 3dB)

 ● Frequency response: 20 Hz ~ 10 kHz (±2 dB)

 ● 10 kHz ~ 20 kHz (±3 dB)

 ● Dynamic range: 29 dBA ~ 140 dB

 ● Polarization Voltage: Prepolarized

 ● Pressure equalization: front-vented

 ● Built-in preamplifier with ICCP power supply

 ● Optional TEDS (IEEE.1451.4)


 ● Low-cost microphone

 ● Suitable for array applications such as near-field acoustic holography (NAH), beamforming, etc.

Technical Parameters
Sound Field Free-field
Diameter 1/4”
Class (IEC 61672) Class 1
Sensitivity@250 Hz (mV/Pa) (±3 dB) 11.2
Polarization Voltage 0 V (Prepolarized)
Frequency Response (Hz) 20 ~ 10 k (±2 dB), 10 k ~ 20 k (±3 dB)
Dynamic Range (dBA ~ dB) 29 ~ 140
Self-generated Noise (dBA) 29
Maximum Sound pressure level (dB) ≥ 140 (3% distortion)
Pressure Equalization Front-vented
Preamplifier Built-in
Output Impendence (?) < 150
Maximum Output Voltage (Vpeak) ±5
Power supply ICCP (2mA ~ 20mA, 4mA typical)
Output Connector SMB
TEDS Optional, IEEE 1451.4 compliant (default v0.9, optional v1.0)
Operating Temperature Range (°C) -10 ~ 50
Operating Humidity Range (%RH) 0 ~ 90
Dimension (mm) Φ7 × 34.1
Weight (g) 5.0

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