Streaming system: what you need
All your music goes in here. It’s an intelligent hard drive that can be accessed by other components within your network.
Deals with the music stored in the NAS and turns it into an electronic signal your amplifier can work with.
Not an essential part of the streaming system equation, but a good way of isolating your network from outside interference.
The control centre of your network. This manages the communication flow. You can connect to it via wired ethernet or wi-fi.
The best way to navigate around your music collection is with a dedicated app. A phone will do the job but a tablet is better.