I have. The Classic Audio Loudspeakers are **easily** in the same league. If I had to compare, the CAL is a bit smoother, owing to a better interface between the throat and horn, resulting in far less artifact. The field coil compression driver is also a higher performance bit of kit.
I would expect no less of the T3’s, or CAL speakers overall. The DD67000’s are great speakers, and somewhat better than their smaller K2 S9900 sibling than I initially thought, but there’s a shred of "splashy-ness" to their midrange than when not there lends a smoother imprinting, as you point to with the CAL’s. What are the T3’s sold for - close to $100k? Re: mentioned "better interface" it reminds of what Simon Mears told me of the importance of the coupling between the compression driver exit and the throat of the horn it’s mounted to; transition, transition, transition - as he put it.
Phusis, I would bet there are a host of SS amps that would handily out perform any SET amp. Any small class A Pass amp for sure. JC1’s definitely and most probably all of Atma-Sphere’s amps. Like trying to race a 911 in a VW Bug.
"Outperform;" per your ears or more from a theoretical perspective? And in what context of speakers? SET’s, great ones at that, are dependent on very high efficiency speakers (and not too heavy an overall load) to perform their best, at least from my chair. Paired properly as such I find the combo is magical, or just rather natural and uninhibited sounding. I suspect most haven’t really auditioned them in the context I refer to, and if they have the speakers here (typically all-horns) may been so far from their usual sonic menu that an assessment would veer closer to their imprinting, and not the amp(s). Myself I certainly can’t complain using a variety of SS-based amps in my set-up, but I wager a substantial aspect of this rests in it being a fully active configuration.