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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

If you don’t see the answer to your question, call our 24/7 SensorLineSM 716-684-0001 to speak with an application engineer or visit Ask the Acoustics Experts.

I have static pressure coefficient for my PCB® microphone preamplifier system but what is the static pressure limit? Can this microphone operate at 40,000 feet?

The static pressure limit is the positive pressure limit on the diaphragm.  At 40,000 ft. the ambient pressure is 21 kPa (vs. 99 kPa in Western NY).  This is a pressure differential of 13.5 dB, but the microphone will only see this pressure if the altitude is changing faster than the microphone is venting.  It is important to know what the rate of change in pressure the microphone will experience. PCB® recommends no more than 0.5 psi/s (3.5 kPa/s).  

I have static pressure coefficient for my PCB® microphone preamplifier system but what is the static pressure limit? Can this microphone operate at 40,000 feet?

The static pressure limit is the positive pressure limit on the diaphragm.  At 40,000 ft. the ambient pressure is 21 kPa (vs. 99 kPa in Western NY).  This is a pressure differential of 13.5 dB, but the microphone will only see this pressure if the altitude is changing faster than the microphone is venting.  It is important to know what the rate of change in pressure the microphone will experience. PCB® recommends no more than 0.5 psi/s (3.5 kPa/s).