The Moonriver Model 404 is a high-performance integrated amplifier designed to deliver accurate, natural musical reproduction while maintaining a simple and user-focused operating experience. Built around a fully discrete preamplifier and power amplifier architecture, it combines substantial power reserves with carefully selected through-hole components and multiple independent power supplies.
The amplifier features a modular design that allows optional phono stage and DAC upgrades to be installed at purchase or added later. Additional functionality includes a tape monitor loop, balance control, stereo/mono switching, and dual preamplifier outputs, making the Model 404 a flexible solution for both modern and traditional audio systems.
| Dimension | 430 mm (W) × 390 mm (D) × 135 mm (H) |
|---|---|
| Weight | 12 kg |
| Inputs | 5 inputs (line input 1 and 4 may be occupied by optional phono stage and USB DAC modules), 1 tape monitor loop |
| Outputs | 2 × preamp outputs, 1 × record output |
| Maximum Output Power | 50 W per channel into 8 Ω |
| Frequency Response | 10 Hz to 50 kHz |
| Total Harmonic Distortion | 0.05% |
| Signal-to-Noise Ratio | 85 dB (line input) |
| Idle Power Consumption | 22 W |
| Power Supply Configuration | 5 independent power supplies |
| Volume Control | ALPS potentiometer |
| Signal Switching | Relay-controlled |
| Amplifier Topology | Fully discrete preamplifier and output stages |
| Construction | Through-hole component design |
| Phono Stage Options | Optional MM or MM/MC phono modules |
| DAC Options | Optional USB DAC and SPDIF DAC modules |
