GRAS 44AA Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier

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GRAS 44AA Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier

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GRAS 44AA Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier

G.R.A.S.
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At the mouth reference point (MRP), which is 25mm from the detachable lip ring (35mm from the mouth of the GRAS 44AA), the maximum continuous signal it can produce in 1/3-octave bands is 100dB re. 20µPa in the frequency range 100Hz to 16kHz. Its loudspeaker accepts an external signal either directly or via its own built-in power amplifier (when power is applied).

Jigs are included for calibration according to CCITT P.51 and IEEE 269. These are for use with 1/4" or 1/2" microphones. One jig holds the microphone at 0º incidence (1/4" only) to the sound source, the other at 90º incidence (1/4" or 1/2").
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