I listened to the Stirling Broadcast and Spendor speakers on this amplifier. The Moonriver Audio Model 404. Moonriver is a Swedish company and this is their first and so far only product. it’s got a really high end feel. It looks expensive, classy and retro. It’s modular, so you can add a DAC or phono stage.
About the sound, I only heard this one amplifier connected to the speakers, so it’s hard to say a lot about its character, but the speakers sounded lively and it was able to bring out the clarity of the Stirlings.