Special microphones

Special microphones are often required for applications where there are particular requirements regarding the methods of measurements and configurations.

GRAS special microphones are categorized as

GRAS 46AZ 1/2'' CCP Free-field Standard Microphone Set, Low Frequency

Freq range (±3 dB): 0.5 Hz to 20 kHz
Dyn range: 17 dB(A) to 138 dB
Sensitivity: 50 mV/Pa
Use: For low frequency acoustic diagnostics

GRAS 46AZ 1/2'' CCP Free-field Standard Microphone Set, Low Frequency

The GRAS 46AZ is a 1/2" Constant Current Power (CCP) free-field microphone set for measuring medium sound pressure levels at low frequencies. It is terminated with a BNC connector and is TEDS compatible. The equivalent traditional 200 V (LEMO) type is GRAS 46AN...

GRAS 47AC 1/2" CCP Infra-Sound Microphone Set

Freq range: 0.09 Hz to 20 kHz
Dyn range: 20 dB(A) to 148 dB
Sensitivity: 8 mV/Pa

GRAS 47AC 1/2" CCP Infra-Sound Microphone Set

The GRAS 47AC is a 1/2" CCP free-field microphone set optimized for infra-sound measurements down to 0.09 Hz...

GRAS 47AD 1/2'' CCP Flush-mount Microphone Set, High Sensitivity

Freq range: 3.15 Hz to 10 kHz
Dyn range: 18 dB(A) to 138 dB
Sensitivity: 50 mV/Pa

GRAS 47AD 1/2'' CCP Flush-mount Microphone Set, High Sensitivity

The GRAS 47AD 1/2" CCP Flush-Mount Microphone Set is a low profile 1/2" precision pressure microphone with built-in CCP preamplifier. It's identical to the GRAS 47AX but differ in specifications...

GRAS 47AX 1/2'' CCP Flush-mount Microphone Set

Freq range: 3.15 Hz to 20 kHz
Dyn range: 22 dB(A) to 150 dB
Sensitivity: 12.5 mV/Pa

GRAS 47AX 1/2'' CCP Flush-mount Microphone Set

The GRAS 47AX 1/2" CCP Flush-Mount Microphone Set is a low profile 1/2" precision pressure microphone with built-in CCP preamplifier...

GRAS 47BG-FV 1/4" CCP Miniature Flush-mount Microphone set, High Pressure

Freq range: 3.15 Hz to 60 kHz
Dyn range: 60 dB(A) to 184 dB
Sensitivity: 0.23 mV/Pa

GRAS 47BG-FV 1/4" CCP Miniature Flush-mount Microphone set, High Pressure

The GRAS 47BG-FV is a front-vented ¼″ CCP pressure microphone set for measuring very high sound pressure levels using flush mounting and where mounting space is limited or restrictive...

GRAS 47BX 1/4" CCP Flush-mount Microphone Set

Freq range: 4 Hz to 70 kHz
Dyn range: 44 dB(A) to 166 dB
Sensitivity: 1.6 mV/Pa

GRAS 47BX 1/4" CCP Flush-mount Microphone Set

The GRAS 47BX 1/4" CCP Flush-Mounted Microphone Set is a low profile 1/4" precision pressure microphone with built-in CCP preamplifier...

GRAS 47DX 1/8” CCP Flush-mount Microphone Set

Frequency range: 10 Hz to 100 kHz
Dynamic range: 52 dB(A) to 174 dB
Sensitivity: 0.8 mV/Pa

GRAS 47DX 1/8” CCP Flush-mount Microphone Set

The GRAS 47DX 1/8" CCP Flush-mount Microphone Set is a low profile 1/8" precision pressure microphone with built-in CCP preamplifier and TEDS...

GRAS 47HC 1/2'' CCP Low-noise Microphone System

Freq range: 10 Hz to 20 kHz
Dyn range: 6.5 dB(A) to 100 dB SPL (20 Hz - 8 kHz)
                      6.5 dB(A) to 85 dB SPL (8 kHz - 20 kHz)
Sensitivity: 400 mV/Pa

GRAS 47HC 1/2'' CCP Low-noise Microphone System

The GRAS 47HC ½" Low-noise Microphone System measures sound pressure levels down to close to the threshold of human hearing. It is thus generally suitable for sound-power measurements on even very quiet products. Its very wide dynamic range permits measurements down to below 6.5 dB re. 20 μPa (in 1/..

GRAS 48LA UTP Microphone, High Pressure

Freq range:  20 Hz to 20 kHz (±1 dB)
                       16 Hz to 31.5 kHz (±3 dB)
Dyn range: 64 dB(A) to 184 dB
Sensitivity: 0.12 mV/Pa (±2 dB)
Use: For aeroacoustic measurements

GRAS 48LA UTP Microphone, High Pressure

48LA is an Ultra-thin Precision (UTP) surface microphone for aeroacoustic testing. It is a low-profile ¼″ CCP high-pressure condenser microphone. The microphone is only 1 mm high and can, therefore, be mounted in air flow without disturbing the sound field...

GRAS 48LX-1 UTP Microphone, Medium Pressure

Freq range: 20 Hz to 31.5 kHz (±1 dB)
                       10 Hz to 50 kHz (±3 dB)
Dyn range: 54 dB(A) to 170 dB
Sensitivity: 0.6 mV/Pa (±3 dB)
Use: For aeroacoustic measurements

GRAS 48LX-1 UTP Microphone, Medium Pressure

48LX-1 is an Ultra-thin Precision (UTP) surface microphone for aeroacoustic testing. It is a low-profile ¼″ CCP medium-pressure condenser microphone. The microphone is only 1 mm high and can, therefore, be mounted in air flow without disturbing the sound field.  ..

GRAS 50AI-B 1/2" LEMO Intensity Probe

Freq range: Ref. IEC 61043 Class 1
Dyn range: 25 dB(A) to 152 dB
Sensitivity: 25 mV/Pa

GRAS 50AI-B 1/2" LEMO Intensity Probe

The GRAS 50AI-B Sound-intensity Probe builds on more than 20 years of theory and practical experience in sound-intensity measurements. It is adjustable, durable and fully complies with the requirements in IEC 61043, Electroacoustics- Instruments for the Measurement of Sound Intensity- Measureme..

GRAS 50AI-C 1/2" LEMO Intensity Probe

Freq range: Ref. IEC 61043 Class 1
Dyn range: 25 dB(A) to 152 dB
Sensitivity: 25 mV/Pa

GRAS 50AI-C 1/2" LEMO Intensity Probe

The GRAS 50AI-C Sound-intensity Probe builds on more than 20 years of theory and practical experience in sound-intensity measurements. It is adjustable, durable and fully complies with the requirements in IEC 61043, Electroacoustics- Instruments for the Measurement of Sound Intensity- Measureme..