My amp uses the same DAC chip as the AQ Dragonfly (I forget which color). It's a decent enough DAC chip for my needs. The amp allows for Digital Coax, Toslink and has a USB input, as well. I am using a desktop computer which is capable of 24/386 file playback, streaming to the amp's DAC via an upgraded USB cable.
My source is Amazon Music HD which has files that go beyond CD quality with 24/44, 24/48. 24/96 and 24/192. Most of the files are either 16/44 or 24/48.
I was going to buy a dedicated streamer, but my 67 year old ears and moderately priced stereo system (under 4K) have made that purchase unnecessary. I may purchase some upgraded ethernet cables for an inexpensive tweak.