Moonriver Audio Integrated Amplifiers

Model 404

Three years of R&D. 50 watts. Malmö craft.

The Model 404 is Moonriver's original integrated amplifier and the platform the Reference is built on. Three years of development went into a 50 W/channel dual-mono design with five separate power supplies, a fully discrete preamp section, and relay-based signal switching. Two of the five line inputs can be fitted with optional MM or MM/MC phono modules and SPDIF or USB DAC modules without soldering. A Blue ALPS motorised potentiometer, 30 A soft-start relay, and solid walnut side panels round out the package. Hand-assembled through-hole construction in Malmö, Sweden.

At a Glance

●50W per channel (8Ω)

●Class A/B dual-mono topology

●5 separate power supplies

●Fully discrete preamp section

●5 line inputs + tape loop

●Optional MM or MM/MC phono module

●Optional SPDIF or USB DAC module

●Blue ALPS motorised volume

●Solid walnut side panels

●12 kg / 430 × 390 × 135 mm

●Hand-assembled in Sweden

Key Features

Dual-Mono Power Amp

Separate transformer windings and five independent power supplies with overload protection give each channel its own reservoir of current — the foundation for the 404's unforced dynamics.

Fully Discrete Preamp

No op-amps in the preamp signal path. A discrete, relay-switched preamp section keeps the chain between source and power stage as short and transparent as possible.

Modular Phono / DAC

Line inputs 1 and 4 can be reassigned to an optional MM or MM/MC phono module (user-adjustable gain via dip switches) or a SPDIF/USB DAC module — installed without soldering.

Through-Hole Construction

All analog circuits use through-hole components hand-soldered onto PCBs laid out for the shortest possible signal path. A tool-free top plate makes the amplifier serviceable for decades.

Technologies Inside

Through-Hole Construction

Built to last. Built to be serviced.

Every Moonriver product uses through-hole components in its analog circuits — hand-soldered onto PCBs designed for the shortest possible signal paths. This traditional construction method is more labour-intensive than surface-mount, but it produces more robust joints, is easier to inspect and service, and allows components to be replaced individually decades from now.

Surface-mount technology dominates modern electronics for cost and density reasons, but Moonriver deliberately chose a different path. Through-hole components have larger solder joints that resist fatigue and thermal cycling. The PCB layouts are optimised for minimal trace length rather than maximum component density, keeping the signal path as short as physically possible. Tool-free lid removal means any qualified technician can inspect and maintain the amplifier without special equipment.

Gallery

A closer look at the Model 404.

Experience the Model 404

Visit our showroom for a personal demonstration. Hear the difference for yourself.

Book a Demo Visit Moonriver Audio

For complete specifications and technical details, visit the official Moonriver Audio website.