In response to OP’s question, a number of people here have pointed to GaN technology and specifically the AGD Audion mono blocks. I have these amps now for a few weeks and second the positive sentiment.
My signal chain is Roon (on MacBook Pro) via WiFi (Linksys Mesh) to OPPO 205 to (XLR analog) DSPeaker X4 to AGD Audion to Viking Acoustics Berlin MkII. X4 crosses to 15” sealed Rythmik sub below 50Hz.
The amps sound wonderful. Endless detail, texture, spatial detail even at very low volume. No listening fatigue. Relative to my (obviously limited, but meaningful over the years) experience, these amps are a discrete innovation worth listening to.
My signal chain is Roon (on MacBook Pro) via WiFi (Linksys Mesh) to OPPO 205 to (XLR analog) DSPeaker X4 to AGD Audion to Viking Acoustics Berlin MkII. X4 crosses to 15” sealed Rythmik sub below 50Hz.
The amps sound wonderful. Endless detail, texture, spatial detail even at very low volume. No listening fatigue. Relative to my (obviously limited, but meaningful over the years) experience, these amps are a discrete innovation worth listening to.