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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.

Why do the PCB® short preamplifier models, 426A07 and 426A13, have 2 vent holes in them?

Vent holes allow for equalization of the external pressure. This also impacts the low frequency specification. If the preamplifier vent hole gets covered or sealed, the microphone will not work properly. A microphone holder can block this vent. A short preamplifier has very little surface area to clamp onto, so there is a higher probability of blocking the vent. This is why a second vent hole on a different axis was added.

Why do the PCB® short preamplifier models, 426A07 and 426A13, have 2 vent holes in them?

Vent holes allow for equalization of the external pressure. This also impacts the low frequency specification. If the preamplifier vent hole gets covered or sealed, the microphone will not work properly. A microphone holder can block this vent. A short preamplifier has very little surface area to clamp onto, so there is a higher probability of blocking the vent. This is why a second vent hole on a different axis was added.