You say in general panels are as flat as cones.
Well actually I made the opposite claim.
F’rinstance Martin Logan CLXs are +-3dB from 56 to 23000 Hz. How much flatter would you like?
Super poor example. I can’t find published measurements, and you are literally cherry picking a single $25,000 multi-way planar speaker. Trying to refute my claim of "general" with a very specific and unusual planar isn’t really a good way to get to clear thinking my friend. You also seem to have completely ignored my opening caveats:
It varies a great deal, but usually...
So I can be 100% correct and the CLX may still be unusually good performers. There's no conflict in these two statements, but I would love to see a frequency response chart just for giggles.