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Also look at the larger off-axis angles:
The slight dip around 2 kHz makes sense as otherwise the sound power would be too high there due to the slight widening of the directivity.
At the listening position it almost completely disappears thus, for example at J. Atkinsons room:
Fig.7 KEF LS50 Meta, spatially averaged, 1/6-octave response in JA's listening room (red), and of original LS50 (blue), source https://www.stereophile.com/content/kef-ls50-meta-loudspeaker-measurements
and in mine, without any EQ:
You rather see a small 1dB accentuation of the region between 4-6 KHz which can be seen also in the upper plot.
The slight dip around 2 kHz makes sense as otherwise the sound power would be too high there due to the slight widening of the directivity.
At the listening position it almost completely disappears thus, for example at J. Atkinsons room:
Fig.7 KEF LS50 Meta, spatially averaged, 1/6-octave response in JA's listening room (red), and of original LS50 (blue), source https://www.stereophile.com/content/kef-ls50-meta-loudspeaker-measurements
and in mine, without any EQ:
You rather see a small 1dB accentuation of the region between 4-6 KHz which can be seen also in the upper plot.