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  • RA0038

    The Coupler Type RA0038 is a standard 2 cm³ Coupler according to IEC 126 and ANSI S3.7-1973. It uses a ½" microphone (preferably the Type 40AG) with a suitable preamplifier (e.g. the Type 26AC which is a ¼" preamplifier but is …

  • RA0113

    A 2cc IEC 60126 coupler which uses a 1" microphone, e.g. the G.R.A.S. Type 40EN.

  • RA0075

    The RA0075 is a Coupler for testing earphones according to ANSI S 3.7 – 1995.