As to whether DAC's need to be hardwired, I think it's optional provided that you have a robust wireless network. And this usually means that you've hard-wired access points throughout the house to allow for high-reliability wireless connections with the DAC. Music doesn't require a tremendous amount of bandwidth, so I would definitely stop short of saying that wired ethernet would be mandatory, although it is more reliable (and secure). It's taken me 15+ years to fully learn this, but having the infrastructure of a wired network is what allows you to have a robust wireless network. You will also thank me when you and your family members roam throughout the house on your tablets and laptops completely seamlessly and with good transfer rates.
I'm not sure exactly what you mean by "purpose built streamer". Do you mean a media server that you build yourself and load software on it (such as Plex Media Server)? If so, then yes, that's a great way to go. Just remember that backups (both local and cloud-based) are critical. For local backups, I use the Macintosh Time Machine, and for cloud backups I use Crashplan (since they have no data limit, so I have literally terabytes of data backed up to their central facility at no extra cost).
It sounds confusing, but the research you do now will save you considerable headaches in the future. You don't want to make early decisions that will severely limit your capabilities not only today but also a couple years from now.
Michael
I'm not sure exactly what you mean by "purpose built streamer". Do you mean a media server that you build yourself and load software on it (such as Plex Media Server)? If so, then yes, that's a great way to go. Just remember that backups (both local and cloud-based) are critical. For local backups, I use the Macintosh Time Machine, and for cloud backups I use Crashplan (since they have no data limit, so I have literally terabytes of data backed up to their central facility at no extra cost).
It sounds confusing, but the research you do now will save you considerable headaches in the future. You don't want to make early decisions that will severely limit your capabilities not only today but also a couple years from now.
Michael