The issue is said 3" has a footprint closer to a 6" driver, compromising the directivity blend.
Also, the main foundational shifts include: DSP (incl. phase linearisation), computer-aided systems design with directivity matching as a goal which a 3" driver of the kind ATC does active impedes...
The basic tenets have been known for so long that it only reflects poorly on manufacturers who fail to attain even this minimum level.
Also, it is rather disingenuous to dismiss waveguides. The basic concept of directivity matching and the role of waveguides in this was discovered way after...
Just because a brand *says* it is state-of-the-art and one *believes* it to be so based on limited knowledge and anecdotal experience against the weight of evidence does not make it *actually* state-of-the-art.
Just a comment for those trying to make sense of all the marketing drivel and slick...
Because boutique audio is less about the actual sound waves than the story a brand tells. Millions spent on FEA and BEM doesn't sell headphones in the megabuck range unless the jump is as big as the HD800 was in a world of DT880/HD650 20 years ago
What I'm seeing is people using anecdote and intuition to deny the logic and evidence you have brought to this thread. Which is saddening to see on this forum when people stubbornly insist to make excuses for backward designs instead of challenging their outdated beliefs
More likely @VSem is referring to PSI Audio, a Swiss boutique studio monitor manufacturer which staunchly believes in using tedious and expensive analog-based methods for linearising phase and time alignment. These have, believe it or not, even more of a cult of personality than ATC et al
But you assume the set of compromises ATC selects for is the best we can do, and is equally valid or legitimate to any other. Patently not the case. Not for the price. And not for even a lower price.
The apologism and complete refusal to acknowledge the evidence is frankly tiresome and...
That's not hard to achieve when one builds a driver with the 6" footprint but a 3" radiating surface severely compromising the overall system performance.