404 Modules

The Moonriver 404 Standard and 404 Reference integrated amplifiers utilize a modular internal arrangement allowing for expansion of different features and technologies as they develop.  

404 MM Phono or 404 MM/MC Phono

Model 404 comes with two options in the phono stage department; one is MM only and the other is MM/MC selectable. Both follow the exact quality principles that Model 404 is built on. Quality components and massive power supplies are also employed here, to efficiently accommodate very low noise, high performance op-amps.  The gain in the MM/MC phono can be adjusted, simply by changing the dip switches position. The MC input load can be set also, by replacing the original 100 Ohm input resistor with a higher or lower value. No soldering is required.

404 USB DAC

The add-on USB DAC module is based on the 9000 series ESS Sabre DAC chip with native DSD support. The USB DAC supports PCM up to 384kHz/24bit and DSD up to 128. The USB input section is separated with discrete, very low drift clocks, XMOS input based chip with custom firmware. There are 5 separated power supplies with very low noise regulators, 2 for the USB board, 2 for the ESS dac board and 1 for the analog circuit. Specially care has been given to the voicing of the analog output stage to match the dynamic and natural character of Moonriver sound. The capacitor bank is massive and it uses 42000uF (in case of 404 Reference) from the power amplifier’s power supply.

404 SPDIF DAC

The add-on SPDIF DAC module is based on the 9000 series ESS Sabre DAC chip. The SPDIF supports PCM streams up to 192kHz/24bit due to the limitation of the SPDIF (coaxial) specifications. There are 3 separated power supplies with very low noise regulators, 2 for the ESS DAC board and 1 for the analog circuit. The capacitor bank is massive and it uses 42000uF (in case of 404 Reference) from the power amplifier’s power supply.

Special care has been given to the voicing of the analog output stage on each DAC to match the dynamic and natural character of Moonriver sound. The result is an impressive sounding digital-to-analog converter which respects the timing, the space and the color of the music and unfolds the dynamic contrast – the definition of every musical event.

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Select the options you prefer and place them in your cart:

404 MM Phono, $679

404 MM/MC Phono, $849

404 USB DAC, $829

404 SPDIF DAC, $1,249