An interesting comment. Every time there is a new model, reviewers comment on how much better the new model is, usually enhancing the problems of the previous one. Just reading the review of the new component we would be persuaded how horrible was the last version.
However is this case JVS clearly explains why he had issues with the old Alexia:
https://www.stereophile.com/content...-loudspeaker-jason-victor-serinus-august-2018
"As much as I loved the organic, liquid sound of the original Alexia, I was frustrated by the effect of its notorious impedance dip in the bass with the Pass Labs XA 200.8s, whose grip on the Alexias' bass was loose. Nor could the pair of Margules Audio U280-SC Black tubed monoblocks I'd reviewed last November even begin to cope with the Alexias' bass demands "
Later he writes
"The Alexia 2s' bass also sounded more true. When, through the original Alexias, I played recordings in which pianists used the instrument's entire 88 keys, the sound quality changed as their fingers moved up and down the keyboard. I never heard a crossover bump per se, but the overall timbre of the bottom octave sounded different from that of the notes above it. With the Alexia 2s, I heard no such discontinuity. "
It is is these cases that the measurements of Stereophile are valuable, helping us to find the correlations between technical and sound quality. What JVS was listening was the effect of an suboptimal amplifier, many (not all...) Wilson Audio speakers need current and are not tube friendly. IMHO it is all shown in the measurements section of the Alexia's
I have owned the original Alexia's for some time - a great sounding speaker by any standards, but surely not amplifier friendly and needing a large room. Effectively in my room it sounded much better with the D'Agostino stereo, and I was not thinking about giving up on tubes it was not a long time stay, and the beautiful Alexia's in Hermes orange moved away.
Surely the situation improved with the more friendly impedance of the Alexia 2, that is an overall a better speaker - a good friend upgraded his pair, in spite of owning the D'Agostino's.
BTW, it something miss about several Magico's - as they are mostly reviewed by TAS, not by Stereophile, we do not have access to independent detailed measurements.