Why adjustment to crossover point is significant change? It can be anywhere. But resulting frequency response matters. I mean what the difference in crossover point if frequency response is seamless? I do not see any crossover joint.It's similar to the ls50 vs ls50 metas. The adjustment to the crossover point and the tweeter level are likely to yield the biggest audible change between the OG and meta models.
The directory is unchanged with between the R3 and R3 meta. No longer is there a broadband low amplitude rise above 2 khz. The 3khz peak has been tamed. The early reflections are now almost perfect on the R3 meta. This will account for the largest audible difference. Who can say if the other improvements can be heard. Pretty much need double blind testing to know for sure.
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This shows what i am saying. Keep in mind the original kef measurement for R3 was not measured the same way as the new metas. Amirs measurements align more with the differences shown in the meta white paper.
The relative improvement in linearity between the mids and highs is your answer