@svart-hvittEDIT: I've been trying to find a good example of this online. Unfortunately the best I can do is a speaker measured at 5° increments (it's the Genelec 8351A measured by 3D3A Labs at Princeton). It's clear though that you see plenty of 1 or 2dB peaks and dips from -5° to 0° to +5°.
Look at that on-axis c. 2dB dip @ 6KHz. They've apparently decided to have it there because at -5° and +5° the tweeter is once again flat. If the designer had chosen to bump up that 6KHz dip to flatten it, the outcome would be a less neutral speaker, even though it would now have less linear on-axis response on paper.
Ditto the more broadband on-axis dip throughout most of the top octave. There may be other variations not captured by the 5° measurement increment chosen by 3D3A.
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The D&D 8C will be measured there in the coming months.
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