Some Basic Questions

I have my music in iTunes on a Mac Mini. The Mini has two user accounts – one for me and one for my wife. My has a separate music library.
The mini is hard-wired by USB to my Peachtree Nova (which includes a DAC).

I understand that Roon will provide a much different user interface for my music library. Will it also affect the sound quality? Should it be noticeable? Are the settings

Will Roon support the two user accounts on the Mini?

Thanks in advance.

Depends. If you’re listening to MP3s, then no. :laughing:
https://kb.roonlabs.com/FAQ:_How_do_I_import_my_iTunes_library%3F

There’s only one Roon account, but multiple profiles. Multiple profiles can give you the separation you want.
https://kb.roonlabs.com/Profiles

BTW - Roon has a fully enabled free trial.