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 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...
Freq range: 3.15 Hz to 20 kHz
Dyn range: 20 dB(A) to 164 dB
Sensitivity: 12.5 mV/Pa
GRAS 40AU-1 1/2" Ext. Polarized Reference Pressure Microphone
The 40AU-1 is an IEC 61094 LS2aP ½" externally polarized reference microphone that is rear-vented. It is a ½" laboratory-standard pressure microphone that is ideal for precision sound pressure measurements. It has a front cavity as specified in IEC 61094-1 and is supplied with a protective dust cap...
Freq range: 0.5 Hz to 20 kHz
Dyn range: 14 dB(A) to 148 dB
Sensitivity: 50 mV/Pa
GRAS 40AZ 1/2" Prepolarized Free-field Microphone, Low Frequency
The 40AZ is a prepolarized free-field microphone with a large dynamic range and a wide frequency response. Its externally polarized equivalent is GRAS 40AN...
Freq range: 5 Hz to 70 kHz
Dyn range: 44 dB(A) to 174 dB
Sensitivity: 1.6 mV/Pa
GRAS 40BD 1/4" Prepolarized Pressure Microphone
The 40BD is an IEC 61094 WS3P ¼″ prepolarized pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. Its low sensitivity makes it ideal for sound measurements at high sound pressure levels of up to 174 dB. Its small size reduces..
Freq range: 5 Hz to 70 kHz
Dyn range: 44 dB(A) to 174 dB
Sensitivity: 1.6 mV/Pa
GRAS 40BD-FV 1/4" Prepolarized Pressure Microphone, Front Vented
The 40BD-FV is an IEC 61094 WS3P ¼″ prepolarized pressure microphone with front venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. Its low sensitivity makes it ideal for sound measurements at high sound pressure levels of up to 166 dB. Its small size red..
Freq range: 4 Hz to 80 kHz
Dyn range: 30 dB(A) to 168 dB
Sensitivity: 4 mV/Pa
GRAS 40BE 1/4" Prepolarized Free-field Microphone
The 40BE is an IEC 61094 WS3F 1/4” prepolarized free-field microphone with rear-venting. The externally polarized equivalent is 40BF. NOTE: Optimized for use without protection grid—remove grid before measuring...
Freq range: 4 Hz to 80 kHz
Dyn range: 30 dB(A) to 168 dB
Sensitivity: 4 mV/Pa
GRAS 40BE-FV 1/4" Prepolarized Free-field Microphone, Front Vented
The 40BE-FV is an IEC 61094 WS3F 1/4” prepolarized free-field microphone with front venting. NOTE: Optimized for use without protection grid—remove grid before measuring...
Freq range: 4 Hz to 100 kHz
Dyn range: 30 dB(A) to 172 dB
Sensitivity: 4 mV/Pa
GRAS 40BF 1/4" Ext. Polarized Free-field Microphone
The 40BF is an IEC 61094 WS3F ¼” externally polarized free-field microphone with rear-venting. The prepolarized equivalent is GRAS 40BE. NOTE: Optimized for use without protection grid—remove grid before measuring...
Freq range: 10 Hz to 20 kHz
Dyn range: 54 dB(A) to 193 dB
Sensitivity: 0.4 mV/Pa
GRAS 40BH 1/4" Ext. Polarized Pressure Microphone, High Pressure
The 40BH is an IEC 61094 WS3P ¼" externally polarized high-pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. Its very low sensitivity and wide frequency response make it ideal for measuring very high sound pressure levels o..
Freq range: 4 Hz to 70 kHz
Dyn range: 34 dB(A) to 169 dB
Sensitivity: 1.6 mV/Pa
GRAS 40BP 1/4" Ext. Polarized Pressure Microphone
The 40BP is an IEC 61094 WS3P 1/4" externally polarized pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. It is a low-sensitivity microphone for sound measurements at high levels and high frequencies. Its low sensitivi..
Freq range: 4 Hz to 70 kHz
Dyn range: 34 dB(A) to 169 dB
Sensitivity: 1.6 mV/Pa
GRAS 40BP-FV 1/4" Ext. Polarized Pressure Microphone, Front Vented
The 40BP-FV is an IEC 61094 WS3P 1/4" externally polarized pressure microphone with front venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. It is a low-sensitivity microphone for sound measurements at high levels and high frequencies. Its low sensi..
Freq range: 6.5 Hz to 70 kHz
Dyn range: 49 dB(A) to 175 dB
Sensitivity: 0.9 mV/Pa
GRAS 40DD 1/8" Prepolarized Pressure Microphone
The 40DD is an IEC 61094 1/8" prepolarized pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. Its tiny size allows it to be used for measuring very high frequency sounds without disturbing the sound field. It can measure sou..
