With the priciest and best quality cables at hand I've experienced a quite audible difference between using the coaxial or optical output from the N130 to the c388. This subreddit is for the budget minded audiophile that wants to grow out of soundbars, boomboxes, mini systems, portable bluetooth, lifestyle speakers, and PC peripheral branded audio solutions. We focus on education, discussion, and sharing of entry and mid level separate & multi component audio. BluOS is NAD's advanced multi-room streaming platform, designed for effortless access to high-resolution music across your home. Supporting all major streaming services and formats up to 24-bit/192kHz, BluOS delivers studio-quality sound with intuitive control. Seamless integration with smart home. My question is, what am I missing w/o the optional $600 MDC2 BluOS-D module? Here are the features from NAD: I'm new to Dirac. Is it "all that"? Is Dirac mainly for surround sound correction only or also for stereo/music listening? I think if I understand it, it would it allow me to stream music to. With NAD's Modular Design Construction (MDC), adding the latest cutting-edge technology can be as simple as a software upgrade and adding a new hardware module into your stereo amplifier. The MDC USB DSD module allows users to experience the convenience of computer music playback and streaming, in. MDC2 BluOS-D Module: NAD's MDC2 BluOS-D module lets you add Dirac Live Room Correction, BluOS high-resolution multiroom audio, Bluetooth aptX, and USB audio to select NAD hybrid digital integrated amplifiers (including the NAD C 389, C 399 and C 3050), giving you access to great sounding wireless. I've been testing out a Node N130 with the my NAD c388 amp and I've experienced that the sound quality varies a lot using different digital cables (coaxial and optical) in various price ranges.