The Moonriver Model 404 Optional MM/MC Phono Stage provides comprehensive vinyl playback support for both moving magnet and moving coil cartridges. Built to the same standards as the Model 404 amplifier, the module employs quality components, generous power supply capacity and high-performance low-noise circuitry.

The MM/MC version provides user-adjustable gain settings via DIP switches and allows MC loading adjustment through replaceable resistors without soldering, enabling cartridge matching and future system flexibility.