I got tired or I fell asleep, only two curves for this set-up ;-( These plots are taken on a RD75 that is suspended 6" above the floor. The bump at 435 Hz is again there. The white plot is taken with the microphone at 1 meter height, the yellow plot with the microphone at 1.5 meter. Similar remarks as before, magnitude response within +/- 3 dB between 600 Hz and 16 kHz. Magnitude of the dips/peaks changing, not the location.