I use a full Femto Auralic Aries feeding a Metrum Hex DAC. The Aries has a USB connection on it. I use WiFi to connect a NAS drive which works very well. Being WiFi it allows you to add streaming from a multitude of sources. It does need a suitable Apple product to control it - I use an iPad but I think you can use an iPhone, but you need to have the right version.
It handles many hirez file types. Virtually all my music is flac but I have a few higher res tracks as well.
You can add which interface you want. I am currently running MinimServer which is intuitive and easy to use.
Sound quality is better than my old Logitech Duet and various CD players I have used including Consonance Droplet 3.1 and Talk Thunder 6.
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