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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.

What is the maximum cable length I can use for a PCB® model 377B02 microphone and model 426E01 preamplifier?

To answer this correctly, additional information is required. Cable length is dependent upon a number of factors. The capacitance of the cable in picofarads per foot (pF/ft), sensitivity (mV/Pa) of the microphone, maximum sound pressure level in decibels (dB) , frequency (Hz) range being measured and constant current (mA) level being supplied, all have an effect on what length of cable can be used. As a benefit of the design, the prepolarized or ICP® style of microphones and preamplifiers allow for use of coaxial cables. Coaxial cables are cost efficient and will exhibit minimal signal loss over long cables lengths. For example: a 50 mV/Pa microphone, measuring 140 dB with a hundred feet of 29 pF cable can only measure up to 9.7 kHz. Increase the constant current to 4 mA and the microphone can measure up to 25 kHz. The maximum SPL has a significant effect. By reducing the SPL to 120 dB and using a 2 mA of ICP® sensor power, approximately 500 feet of cable can be used get to over 19 kHz. 

What is the maximum cable length I can use for a PCB® model 377B02 microphone and model 426E01 preamplifier?

To answer this correctly, additional information is required. Cable length is dependent upon a number of factors. The capacitance of the cable in picofarads per foot (pF/ft), sensitivity (mV/Pa) of the microphone, maximum sound pressure level in decibels (dB) , frequency (Hz) range being measured and constant current (mA) level being supplied, all have an effect on what length of cable can be used. As a benefit of the design, the prepolarized or ICP® style of microphones and preamplifiers allow for use of coaxial cables. Coaxial cables are cost efficient and will exhibit minimal signal loss over long cables lengths. For example: a 50 mV/Pa microphone, measuring 140 dB with a hundred feet of 29 pF cable can only measure up to 9.7 kHz. Increase the constant current to 4 mA and the microphone can measure up to 25 kHz. The maximum SPL has a significant effect. By reducing the SPL to 120 dB and using a 2 mA of ICP® sensor power, approximately 500 feet of cable can be used get to over 19 kHz.