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.

Mari Kodama: Bruckner Piano Works
Mari Kodama, piano
Pentatone PTC 5187 224 (reviewed as 24/192 WAV, also CD). 2024. Erdo Groot, prod., eng.; Shunsuke Yokoyama, piano technician.
Performance *****
Sonics ****½

Music history, like all human history, is filled with nooks and crannies—digressions from the main course of events. Take Anton Bruckner for example. The global concert hall calendars are filled with performances of his symphonies and some of his choral works. New recordings of these pieces are frequently released. How many of you have ever heard a performance, or recording, of any piece for solo piano by Bruckner?

As Jim Austin wrote in this space in the December 2024 issue, following a medical procedure that he had in mid-October, he needed to take several weeks' leave to recuperate. He delegated the magazine's production to Managing Editor Mark Henninger, AVTech Editorial Director Paul Miller, and myself. The three of us worked with copy editor Linda Felaco and longtime art director Jeremy Moyler to produce the issue you hold in your hands.

As readers probably know, I was Stereophile's editor for 33 years until my retirement at the end of March 2019. However, they probably don't know that for the 10 years prior to my joining this magazine in 1986, I was first an editorial assistant, then Deputy Editor, then, in 1982, Editor of British magazine Hi-Fi News. (In a twist of fate, Paul Miller is now Hi-Fi News's Editor.)

While there haven't been any follow-up reviews in recent issues of Stereophile, the January 2025 issue features further coverage of two one-box solutions that were reviewed in 2024—the Hegel 400 streaming integrated amplifier and the T+A R 2500 R multi-source receiver. All the user needs to do to create a complete audio system is to couple one of these products with a pair of passive loudspeakers.