KEF LS50 polars

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Hifisound

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Joined 2010
Following are the horizontal and vertical polars for KEF LS50 from princeton.edu 3D3A

3D3A Lab at Princeton University

KEF_LS50_H_Contour_Plot.png


KEF_LS50_V_Contour_Plot.png


Though they are better than many other speakers and the horizontal and vertical polar equivalence is admirable (due to coax), they still have narrowing around 5kHz.
Given that crossover is 2.2kHz, what else can be causing that ?

(the other narrowing over 10khz can be ignored)

The same is also seen here :
SoundStageNetwork.com | SoundStage.com | NRC Measurements: KEF LS50 Loudspeakers

LS50-HP.gif
 
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