The cause of airiness and luminosity

About COS Engineering

COS Engineering, founded by three close friends serious about audio entertainment, is dedicated to developing gear for the digital era, that renders music listening a sheer pleasure. D1, COS Engineering's first product, made its debut in 2014.

What do I do now?

Roon Ready device
Roon Ready network devices have Roon’s streaming technology built in, and are certified by Roon Labs to provide the highest level of quality and performance in network streaming.
Roon Tested device
Roon Tested devices work over USB, HDMI, AirPlay, Google Cast, and other protocols. They have been profiled by the Roon team to ensure simple setup and effortless daily use.