Any 4 speakers could be „similarly linear“ but that’s quite far from „having almost exactly the same 6 peaks“. And if you dont agree, just find two other speakers measurements like that .. anywhere else. I couldnt but of course I might be wrong there (too).
As mentioned, klippel software is just one possible culprit (and the fact that it measured same as anechoic in some room(s) doesnt mean it’s perfect in all rooms). Tthe culprit could also be anywher else between room and operator. Or, since you like conspiracies, you could also include the wind and the power cables outside
Anyway, did my part here. If someone else thinks there might be something wrong, good .. if not, might just be same as good.
As mentioned, klippel software is just one possible culprit (and the fact that it measured same as anechoic in some room(s) doesnt mean it’s perfect in all rooms). Tthe culprit could also be anywher else between room and operator. Or, since you like conspiracies, you could also include the wind and the power cables outside
Anyway, did my part here. If someone else thinks there might be something wrong, good .. if not, might just be same as good.