Class D amplifiers have a reputation problem. And honestly, for most of their history, it was deserved.
Compressed dynamics. Voicing that felt synthetic. Midbass that looked right on paper but never quite landed in the room. Audiophiles who tried Class D and went back to tubes weren’t wrong — they were responding to something real.
AGD was built around a different premise: that the problem wasn’t Class D as a topology, but how it had been implemented. Specifically, the switching devices. Conventional MOSFETs can’t switch fast enough to keep the artifacts out of the audible range. GaN transistors can.
The Solo is what happens when you take that premise seriously — a 600-watt monoblock built around AGD’s proprietary GaNFET output stage, pushing switching frequencies high enough to get the noise floor and the distortion products out of the way of the music.
Le son absolu awarded the Solo an Editors’ Choice in their June 2026 issue. The reviewers noted effortless micro-dynamic delivery, midbass with real punch and weight, precise soundstage imaging — and, pointedly, no voicing issues. That last one matters. Voicing is where most Class D amplifiers still give themselves away.
This isn’t a milestone we’re resting on. It’s confirmation that the direction is right.
