Back in 2016, I documented the rise of class-D amps using the early TriPath technology. Used in the Bel Canto eVo 200.2, TriPath cracked open the door to the High End but was never admitted due to a dim and opaque treble. The second wave was based on B&O's ICEpower technology, again via a Bel Canto amplifier, the Ref1000M monoblock. ICEpower had more credibility and was accepted by many but, often, only with, ahem, due consideration for size and efficiency. There was an explosion of new class-D amps in 2016 when Stereophile featured glowing reviews of Bel Canto's e.One Ref600M monoblock, Theta's Prometheus monoblock, and NAD's Masters Series M22 stereo amp, all based on Bruno Putzeys's Hypex NCore technology modules. Finally, it seemed that class-D was "in the room," though, even to this day, there remain critics and quibblers who continue to deny them as true high-fidelity products.

Well, time does not stand still and neither did Bruno Putzeys. He, along with Lars Risbo and Peter Lyngdorf, had founded Purifi in 2015, and in 2019 he unveiled the Purifi Eigentakt power amplifier modules.

Taste is a funny thing. Love cilantro? Millions swear it tastes like soap. Similarly, design cognoscenti will gush over a minimalist Scandinavian sofa that others dismiss as just a pricey plank with delusions of grandeur.

There's no accounting for taste, or so the truism goes. But arguing over preferences is exactly what many audiophiles do. Similarly, Stereophile reviewers are all about parsing and evaluating sound, and how a product looks isn't usually a big part of the equation. But I'll buck that convention and say that the radically shaped Estelon X Diamond Mk IIs aren't just the most visually sublime speakers I've laid eyes on; they ought to be part of the Cooper Hewitt Museum's permanent collection. Or MOMA's.