Ok, polarity is inverted, drivers are time aligned and the response looks very clean to me.
Are spinorama charts available for any of the speakers you measured? It would be interesting to see the comparison, athough you index doesn't really correspond to any of those 2 spinorama DI indexes.
Alas not. Which is what inspired me to check them out in the first place. And no, I'd like to do more detailed measurements but unfortunately I don't have the time. The data posted is quite useful though - it gives a decent impression of expected sound quality.
I'll do a Bose S1 next - that should be fun.
Green (listening window) = 0° - 10° - 20° - 30° horizontal average plus up and down 10° from the 0° axis
Red (early horizontal reflections) = 40° - 50° - 60° - 70°- 80° horizontal average
Does this mean you are making 3 times 4 measurements for green curve and 5 measurements for red curve?
Contemplating if I should change the early reflection average from 40 up to 80° from 60° to 80° to give a better directivity overview.
Due the lack of a decent waveguide, there is some off-axis flare centered 3,7kHz - which can get audible under the right circumstances.
There's many kinds and shapes of waveguides, and while it is correct that its primary function should be to match the mid/woofer directivity, there's no reason it could not be designed to maintain it. Of course the tweeter size and geometry also is important.
I agree.
Can you pls explain in more detail what do you think is the reason of that rise of red line around 3.7kHz with KRK speaker?
Btw, that red line still looks quite decent to me..
The tweeter profile looks to be quite round and pronounced, it is mounted in a small/shallow waveguide (faceplate). That little waveguide doesn't maintain directivity for that tweeter, so there is a bit of an off-axis flare as you move beyond 40° horizontal. It is not terrible in terms of off-axis performance, but if you were to A/B it to a similarly neutral speaker, with a better behaved off-axis, it would be noticeable. If I would have to have this one at home, I'd choose to absorb the early reflections.
You think this slight increase in response could have been solved with a deeper well designed waveguide?
Always difficult to say as it's the combination that needs to work well together. I -think- a different geometry in terms of waveguide could help, but then there could be other, new, detrimental effects as a result.