Marshall wrote: We then talked about the idea of "clarity," the ability of a shot to display many distinct flavors. . . .
There's something incomplete about this (probably offhand) "definition" of espresso clarity as "the ability of a shot to display many distinct flavors." In a previous clarity thread I mentioned (or did I just think it?) "movement," that completes the experience. For a shot to display many
distinct flavors, the flavors rise and display sequentially, otherwise, there's just a one-dimensional muddle--which might be tasty, but not so interesting. Sometimes the flavors hang around for a while, sometimes they appear for just an instant, sometimes they emerge as an identifiable "third" flavor as when two or more flavors combine in a novel way.
IMO the phenomenon of "many distinct flavors" is most powerfully affected by cooling, amount of crema in the sip, the blend or SO, and a certain mental readiness to receive the flavors that are present. Each of these is independently affected by machine conditions of design, temp, pressure, basket, etc.
They immediately understood what I was talking about and said that the deep and narrow La Spaziale and Dalla Corte baskets were good at producing sweet, chocolaty shots, but could not do "clarity" like a La Marzocco.
I've had pretty extensive experience with both the Vivaldi II and the DC Mini. I'd agree with this analysis. Given appropriate beans and grind, both machines excel at the crowd-pleasing cheap thrill of chocolaty, heavy shots. Yum.
IMO, this "advantage" of the machines can also mask the fruits and florals that are still there but more easily overwhelmed by the heavier (less clear?) shots from the Viv II and the DC Mini. Is it possible that these two deeper basket, double boiler machines require roasts and blends that are uniquely suited to the characteristics of the machine? I had some slight confirmation of this when I was home roasting and blending. I thought differently about degree of roast and proportions. This is harder to do on the Mini now that I'm using commercial roasts.