Q: Why on Earth would you get two big hulking boxes to do the job that can be achieved by one much smaller box?
A: Because they sound so much better!
Rotel products with a PC-USB input have the ability to replay audio files from your computer. Playback of audio files up to 16-but / 96kHz are supported natively by both Windows and MacOS and do not require additional drivers.
To replay audio files at sampling rates above 96kHz simply install the PC-USB Audio drivers included with your compatible Rotel product.