The NAD DD HDMI-1 Modular Design Construction (MDC) module is designed to complement your NAD C 390DD Direct Digital stereo integrated amplifier, and gives it the capability of switching between three digital video sources. It handles full 3D signals and video resolutions up to 1080/60p. And on the audio side, these ports pass stereo signals of up to 24-bit/192 kHz resolution. Adding this module will help your C 390DD to handle video as elegantly as it handles audio, increasing its value and utility as the heart of your entertainment system.