What player to stream Amazon HD with?

Since my home theater is also my best music system, I can stream it through my Sony TV or through my Roku into my Marantz Pre-amp. Sound is fantastic. I wish they would release an app to my Astell&Kern player like Tidal did for mobile listening but so far, no joy. 

I am using a Node 2i with an MHDT Labs Orchid and it sounds great.  I do echo the above comment about the interface not being the best, but it is functional.

So I might have found an easy fix,  in part inspired by your replies. I simply ordered a USB C- HDMI adapter and ran an HDMI to the oppo and now can access Amazon hd from my Galaxy 9+, which I got in part because it had a rep for great internal sound. 

And so that worked. yes, there's an unsightly HDMI cable stretching to my listening seat, but the Amazon Ultra/HD sound trumps Tidal's basic sound by spades.

Would a USB be a better sound than HDMI?

Cocktail Audio by Novatron. They make N-15D, it is a streamer, DAC and storage. I have an X45 that also has a CD player, ripper, burner. In addition it records analog up to 24/192 (outstanding). No computer needed for anything as music storage is on installed ss memory. Couldn't be happier. It is set up for amazon and many others right out of the box. MQA as well.