1/2” Infrasound (Low Frequency) Microphone System

1/2" Free-field Microphone


  • Frequency 0.13 Hz to 20 kHz (± 2 dB)
  • Noise floor 20 dBA
  • Dynamic Range: (3% Distortion Limit) 136 dB re 29 µPa
  • Prepolarized (0V) design
  • Uses cost effective power supplies and coaxial cables


  • Environmental testing
  • Wind turbine measurements
  • Earthquake and tornado analysis
  • Sonic boom measurements
  • General purpose low frequency noise measurements

Model 378A07 is comprised of a 1/2” (12mm) 377A07 prepolarized microphone, a 426E01 preamplifier, and a low frequency filter adapter, 079A43. For applications measuring infrasound (below the human hearing threshold) the 378A07 provides the capability to measure to 0.1 Hz (-3dB).

Acoustic pressure waves may be altered by objects in the sound field including the measurement microphone. To correct for this, free-field microphones are calibrated to compensate for their own presence. This provides more accurate measurements.

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Model Number378A07
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Price:$1,795.00 USD
Nominal Microphone Diameter1/2"
Frequency Response Characteristic (at 0° incidence)Free-Field
Sensitivity (±1.5dB)-44.7 dB re 1 V/Pa
Sensitivity5.8 mV/Pa
Frequency Range (±2dB)0.13 to 20000 Hz
Frequency Range (±1dB)0.25 to 10000 Hz
Lower Limiting Frequency<0.1 Hz
Inherent Noise20 dB(A) re 20 µPa
Dynamic Range (3% Distortion Limit)136 dB re 20 µPa
TEDS CompliantYes
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