26/12/2025
First, the Moonriver 404 is surprisingly solid and heavy (circa 28 pounds). To me, that indicates that the power-supply components, such as transformers, capacitor banks, and bus bars, are hefty. Not considering the optional modules, the Moonriver 404 has five separate power supplies.
In addition to the usual Power button and Source-selection and Volume controls, the Moonriver 404 has a Mono/Stereo switch, a center-detented Balance control k**b, an Output light and a Source light (both on one dimming switch), and a Tape Monitor control k**b. It appears that the Source selection is actuated by relays. In addition to the Tape Monitor loop, there are two sets of preamplifier outputs.
Inextricably intertwined with the thoughtfulness of the design (or, at least, that seems to be the case to me), is that Moonriver, consciously or unconsciously, in terms of the "Functional Æsthetic," went "Forward, to the Past." By providing so many hard-wired k**bs and switches, Moonriver turned their backs on the "modern" ideas of controlling an audio component by means of a touch screen, or a single, rotate-and-push, k**b.
While each of the four pairs of loudspeakers (of course) sounded rather dissimilar as one would expect (JBL and Chartwell, for instance); on all the loudspeakers, certain performance characteristics of the Moonriver 404 were consistent. I have already noted that it sounded more powerful than 50 Watts. It was also very dynamic, from the smallest gradations of chamber music, to large-scale orchestral works.
However, I think that the most important characteristic is the coherence of the sound. I don't want to use the word "smoothness," because that might give the impression of rounded-off highs. The highs are not rounded off. And that's certainly not what the designer intended, because the small script word "fågelsång" on the front panel means "birdsong."
There is a very organic "togetherness" to the sound. Both in the time domain, and in the frequency domain.
After one of the listening parties, one participant remarked that it was a true measure of how great an audio product the Moonriver 404 is, that nobody really had any comments to make about it. They just listened to it, and enjoyed the music.
To sum up: Highest Recommendation.
Full Review on Positive Feedback by John Marks
https://positive-feedback.com/audio-discourse/moonriver-audio-404/
www.tafosaudio.com/moonriver-audio