The Type 40DD

The Type 40DD
The Type 40DD is a 1/8" microphone for very high level and high frequency measurements. Its low sensitivity makes it ideal for measuring very high sound pressure levels of up to 184 dB (10% dist.).
Its small size reduces the disturbances in the sound field, resulting in a frequency range up to 140 kHz (+/- 3 dB).
This microphone is is similar to the Type 40DP but, as a prepolarised condenser microphone, it does not require an external polarisation voltage and can be used with G.R.A.S. CCP* preamplifiers such as the Type 26CB
Specifications Type 41AO/41AO-S
Specifications Type 40DD
0.7 mV/Pa
Dynamic range:
40 - 174 dB re. 20µPa
Frequency range:
6.5 Hz - 80 kHz
Polarisation voltage:
0 V
Outside diameter (with protection grid):
3.5 mm
Length: (with and
6.7 mm
without protection grid):
6.1 mm
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