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Microphones and Acoustics

Frequently Asked Questions

Get your most commonly asked acoustics questions answered.

Section I: Definitions and Terminology
Section II: Microphone Recommendations
Section III: Calibration and Testing
Section IV: Specification Clarifications
Section V: Specialty Microphone Applications
Section VI: Maintenance and Handling

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What is the anticipated impact of using a microphone at 6290 ft. above sea level?

As static pressure increases, sensitivity goes down. Higher pressure means higher air density, which increases the acoustic impedance on surface of the diaphragm and in the gap between the diaphragm and the backplate. This has an effect on displacement. At 6290 ft. the barometric pressure is 47 kPa, which is a change of -54 kPa.  If we apply that to the pressure correction, the result is  -54 kPa x -0.013 dB/kPa = 0.70 dB re 1V/Pa. 

What is the anticipated impact of using a microphone at 6290 ft. above sea level?

As static pressure increases, sensitivity goes down. Higher pressure means higher air density, which increases the acoustic impedance on surface of the diaphragm and in the gap between the diaphragm and the backplate. This has an effect on displacement. At 6290 ft. the barometric pressure is 47 kPa, which is a change of -54 kPa.  If we apply that to the pressure correction, the result is  -54 kPa x -0.013 dB/kPa = 0.70 dB re 1V/Pa.