For microphones

The GRAS RA0086 is similar to the GRAS RA0067 but is used with a 1/4" externally polarised microphone (typically a GRAS 40BP) which can then be used as a high-impedance sound source, e.g. when calibrating an acoustic coupler such as the GRAS RA0045. The RA0086 has a microdot connector..

For avoiding ground loops, e.g. with GRAS RA0085 Insulated coupling for artificial ear in telephone testing set-ups using the GRAS 43AD Artificial Ear...

Cap for rain protection of GRAS array microphones GRAS 40PR and 40PQ. It also fits QC microphones 40PP and 40PK...

For use when humidity levels are high and only with a rear-vented 1” microphone. An indicator placed on the side of the dehumidifier shows when it needs to be dried out before further use. In the case of the GRAS 40EH 1” Microphone used in the GRAS 40HF Low-noise Level Microp..

For use with GRAS RA0113 2cc Coupler...

The RA0117 is an adapter for mounting a 1/4" microphone in couplers designed for 1/2" microphones...

Recommendation: Choose a microphone with low sensitivity instead of using the RA0118. The RA0118 is an attenuator for inserting between a 1/4" microphone and preamplifier. It attenuates the output signal of the microphone by approximately 16 dB in order to avoid overloading the preamplifier or foll..

For use with 1/2” Free-field microphones when measuring noise according to ANSI requirements...

The RA0127 is a rain protection cap for use with 1/4" microphones...

The GRAS RA0131 is a rain protection cap for use with 1/2" microphones...

For use when humidity levels are high and only with a rear-vented 1/2” microphone. An indicator placed on the side of the dehumidifier shows when it needs to be dried out before further use...

The RA0173 is specially designed and optimized for use with 1/8" microphones for sound pressure measurements, when high speed wind comes from one known direction e.g. in a wind tunnel...