40AF Microphone
from GRAS

Microphones and Accelerometers


G.R.A.S. 40AF is a high-precision condenser microphone made according to IEC 61094-4 requirements. The 40AF’s design is based on the original reference ½” pressure microphone, but optimized for free-field measurements with a 12 dB increase of the sensitivity. The result is a nominal sensitivity of 50 mV/Pa, slightly longer microphone housing, and a natural reduced dynamic range.

It can be used for Type 0 and Type 1 measurements.

40AF is the perfect free-field complement to the G.R.A.S. 40AP ½” Ext. Polarized Pressure Microphone.

Typical applications and use

The properties and robust design make 40AF the natural choice for an all-round free-field, high sensitive microphone suitable for both field-work and laboratory measurements.

The high sensitivity and reliability has made 40AF the preferred measurement microphone for sound level meters/analyzers with 200 V polarization voltage option and, as such, enables IEC 61672 Class 1 measurements.


The 40AF requires a standardized ½” or ¼” LEMO preamplifier and an input module that supports this technology with a 7-pin LEMO connector.

Terms & Conditions

Download a copy of the AcSoft Equipment Rental Terms and Conditions here.

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