Will I notice a significant difference in sound quality between these two? I am currently running an Audio Engine D1 via a USB port on a thunderbolt display and then phono cables out of the D1 to high quality (Swans) desktop speakers. I am considering selling the D1 in favor of an Airport Express connected to the speakers via phono cables which would free up a USB port and double as a wireless access point. The D1 sounds great.