Measurement microphone cartridges
GRAS measurement microphones are available in many types covering various frequency ranges, dynamic ranges and suiting differerent application situations.
To select the microphone that suits your specific measurement needs, your considerations can most likely be summarized as:
• Prepolarized vs. Externally-polarized
• Free-field, Pressure or Random-incidence
• Dynamic range & Frequency range
Consult our microphone guide to learn more about selecting the right microphone.
Freq range: 3.15 Hz to 40 kHz
Dyn range: 20 dBA to 164 dB
Sensitivity: 12.5 mV/Pa
GRAS 40AC 1/2" Ext. Polarized Free-field Microphone, Wide Frequency
The 40AC is an IEC 61094 WS2F classified ½” externally polarized free-field, wide-frequency microphone with rear-venting. The prepolarized equivalent is GRAS 40AM...
Freq range: 3.15 Hz to 10 kHz
Dyn range: 16 dB(A) to 148 dB
Sensitivity: 50 mV/Pa
GRAS 40AD 1/2" Prepolarized Pressure Microphone, High Sensitivity
The 40AD is an IEC 61094 WS2P ½" prepolarized pressure microphone with rear-venting. The externally polarized equivalent is GRAS 40AP..
Freq range: 3.15 Hz to 20 kHz
Dyn range: 15 dB(A) to 148 dB
Sensitivity: 50 mV/Pa
GRAS 40AE 1/2" Prepolarized Free-Field Microphone
The GRAS 40AE is a 1/2" Prepolarized free-field microphone for measuring medium sound pressure levels at medium frequencies. The equivalent externally polarized 200 V type is GRAS 40AF...
Freq range: 3.15 Hz to 20 kHz
Dyn range: 14 dBA to 149 dB
Sensitivity: 50 mV/Pa
GRAS 40AF 1/2" Ext. Polarized Free-field Microphone
The GRAS 40AF is a 1/2" Externally Polarized free-field microphone for measuring medium sound pressure levels at medium frequencies. The equivalent prepolarized 0 V type is GRAS 40AE...
Freq range: 3.15 Hz to 20 kHz
Dyn range: 20 dBA to 164 dB
Sensitivity: 12.5 mV/Pa
GRAS 40AG 1/2" Ext. Polarized Pressure Microphone
The 40AG is an IEC 61094 WS2P ½″ externally polarized pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements and is ideal for coupler measurements in both laboratory and production environments. It is extremely robust and reliab..
Freq range: 3.15 Hz to 31.5 kHz
Dyn range: 20 dB(A) to 163 dB
Sensitivity: 14.5 mV/Pa
GRAS 40AM 1/2" Prepolarized Free-Field Microphone, Wide Frequency
The 40AM is an IEC 61094 WS2F classified ½” prepolarized free-field, wide-frequency microphone with rear-venting. The externally polarized equivalent is GRAS 40AC...
Freq range: 0.5 Hz to 20 kHz
Dyn range: 14 dBA to 149 dB
Sensitivity: 50 mV/Pa
GRAS 40AN 1/2" Ext. Polarized Free-field Microphone, Low Frequency
The 40AN is an IEC 61094 WS2F classified ½” externally polarized free-field, low-frequency microphone with rear-venting. The prepolarized equivalent is GRAS 40AZ...
Freq range: 3.15 Hz to 20 kHz
Dyn range: 20 dB(A) to 163 dB
Sensitivity: 12.5 mV/Pa
GRAS 40AO 1/2" Prepolarized Pressure Microphone
The 40AO is an IEC 61094 WS2P ½" prepolarized pressure microphone with rear-venting. Read about the externally polarized equivalent [40AG]. It is a high-precision condenser microphone made according to IEC 61094-4 requirements and is ideal for coupler measurements in both laboratory and production e..
Freq range: 3.15 Hz to 20 kHz
Dyn range: 20 dB(A) to 163 dB
Sensitivity: 12.5 mV/Pa
GRAS 40AO-FV 1/2" Prepolarized Pressure Microphone, Front Vented
The 40AO-FV is an IEC 61094 WS2P ½" prepolarized pressure microphone with front venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements and is ideal for coupler measurements in both laboratory and production environments. It is extremely robust and reliable a..
Freq range: 3.15 Hz to 10 kHz
Dyn range: 16 dBA to 149 dB
Sensitivity: 50 mV/Pa
GRAS 40AP 1/2" Ext. Polarized Pressure Microphone, High Sensitivity
The 40AP is an IEC 61094 WS2P ½" externally polarized pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements and is ideal for coupler and boundary measurements in both laboratory and production environments. It is extremely robus..
Freq range: 3.15 Hz to 12.5 kHz
Dyn range: 16 dB(A) to 148 dB
Sensitivity: 50 mV/Pa
GRAS 40AQ 1/2" Prepolarized Random Incidence Microphone
The 40AQ is an IEC 61094 WS2P/D ½" prepolarized random-incidence microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements, optimized to measure sound correctly in random, diffuse, and reverberant sound fields. It is extremely robust and rel..
Freq range: 3.15 Hz to 12.5 kHz
Dyn range: 14 dB(A) to 149 dB
Sensitivity: 50 mV/Pa
GRAS 40AR 1/2" Ext. Polarized Random Incidence Microphone
The 40AR is an IEC 61094 WS2P/D ½" externally polarized random-incidence microphone with rear-venting. The 40AR is a high-precision condenser microphone made according to IEC 61094-4 requirements. It also fulfills the requirements of ANSI S1.4...
