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I used an ECM8000 with Sonny's calibration file, extrapolated to -12dB at 5Hz.
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I don't really think you can rely on that as being very meaningful.
Extraploation usually only works with a linear function - which the mic response surely is not.
How do you know the mic doesn't quickly go to zero below 10Hz? (which it likely does). I would restrict the measurement to 10Hz....
Generally, to keep consistent, we post graphs with a vertical axis of 45dBSPL to 105dBSPL. It allows everyone to compare apples to apples....
good response though......
brucek