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After the final molding operation, the
sensitivity and fidelity of each group is checked using air
acoustic calibration boxes. At the centre right of the photograph
is the light gray Head-of-Array Module (HAM). The HAM is used for
power conditioning/RF filtering and is a different color than
modules with acoustic sensors.
sensitivities are within /- 1dB of results predicted by MAI's
finite element models!
Air acoustic calibration boxes ensonify the
entire Trout module uniformly. A small hole between the
loudspeakers permits the use of calibrated measurement microphone
and sound level measuring equipment in accordance with
AS1259.1-1990 and IEC651-1979.