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.

GRAS 40AC 1/2" Ext. Polarized Free-field Microphone, Wide Frequency

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...

GRAS 40AD 1/2" Prepolarized Pressure Microphone, High Sensitivity

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..

GRAS 40AE 1/2" Prepolarized Free-Field Microphone

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...

GRAS 40AF 1/2" Ext. Polarized Free-field Microphone

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...

GRAS 40AG 1/2" Ext. Polarized Pressure Microphone

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 reliabl..

GRAS 40AM 1/2" Prepolarized Free-Field Microphone, Wide Frequency

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...

GRAS 40AN 1/2" Ext. Polarized Free-field Microphone, Low Frequency

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...

GRAS 40AO 1/2" Prepolarized Pressure Microphone

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..

GRAS 40AO-FV 1/2" Prepolarized Pressure Microphone, Front Vented

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 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 reliable an..

GRAS 40AP 1/2" Ext. Polarized Pressure Microphone, High Sensitivity

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..

GRAS 40AP-FV 1/2" Ext. Polarized Pressure Microphone, High Sensitivity, Front Vented

Freq range: 3.15 Hz to 10 kHz
Dyn range: 16 dBA to 149 dB
Sensitivity: 50 mV/Pa

GRAS 40AP-FV 1/2" Ext. Polarized Pressure Microphone, High Sensitivity, Front Vented

The 40AP-S1 is an IEC 61094 WS2P ½" externally polarized pressure microphone with front 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 r..

GRAS 40AQ 1/2" Prepolarized Random Incidence Microphone

Freq range: 3.15 Hz to 12.5Hz
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..