Hi Doug,
As far a high quality audio from a Pi goes, I would start by looking into the JustBoom line of products. There are a lot of options so I’ll just link this list:
Cases will depend on what setup you choose, but you will likely need to modify one of the larger cases that has room for HATs.
You should definitely be look into an extra clean power supply. Standard power supplies can create a hum in the analog audio sometimes, and there isn’t an easy solution. The best way would be a batter:
You may find there is no need in your setup though. The hum is typically only present when no audio is being output.
