¼" Pressure microphone Type 40BD - Prepolarised, High-level

The Type 40BD is a ¼" microphone for high level and high frequency measurements. Its low sensitivity makes it ideal for measuring very high sound pressure levels; up to 174 dB re. 20µPa. Its small size reduces disturbances in the sound field; resulting in a frequency range reaching up to 70 kHz.

It is similar to the Type 40BP, 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.

The following applies only to ¼" microphones
For most applications, rear venting is more advantageous particularly where phase response is critical. However, if front venting is preferred, please add "front venting" to the Type number of the microphone when ordering.

Download PDF Data Sheet: pd_40BD_ver_11_Aug_2010

* Constant Current Power.

Related Products:

Type 40AD
Type 40AG
Type 40AO
Type 40AP
Type 40AU
Type 40BH
Type 40BP
Type 40DD
Type 40DP
Type 40EN
Type 40EU

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1.6 mV/Pa

40 dBA  - 174 dB re. 20µPa

4 Hz - 70 kHz

0 V

7 mm

10.5 mm

10.1 mm