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I'm not certain as to why it would have to have a flat response curve. My impression is that it is only necessary to pick up voice.

If it were for Voice Recognition, then your statement would be correct. But feature we're discussing here is automatic equalization, which requires either (a) a flat response, or if it's not flat, then (b) a carefully plotted calibration chart showing exactly where it's not flat so that the discrepancy can be compensated for in the software.
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Tony Fabris