Even for panels? I know a .5m panel measurement will give innaccurate FR--is phase immune to that issue? And .5m seems like it would create issues in many box speakers too, at least at crossover points.
I never measured panel speakers but I haven't noticed any issues with my floorstanders even at 15cm. In my experience when doing correction mannually the best results I got was when measuring LF at LP with RTA pink noise (moving mic method, at least 1m2 area and at least 60 samples). With near field I was measuring phase response.
In ideal situation you would be fixing phase (timing) of the drivers and passive XO based on measurements in the anechoic environment. As you can't do that at home near field phase measurement is next best choice.
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