Graph above, KEF response with Hypex FA123 24dB at 400Hz and 2500 Hz. No more than +/- 1dB variation.

Below, nearfield measurements for KEF transducers on axis, all measurement done with ECM8000 microfoon.

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  Software used

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  MID 24dB@400/2500Hz

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  HIGH 18dB@2500Hz

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  Click to see cal files

ECM8000 not calibrated. Above 10.000Hz the reality is better than it looks.