I downloaded high-res files and...

My best player is my Audio Research Ref CD9. 

The Reference CD9 incorporates four digital inputs: Asynchronous USB 2.0HS, AES/EBU, RCA, and Toslink. All inputs handle 24 bit / 192k resolution.

I recently downloaded a few albums in FLAC and WAV files that I would really like to play via the CD9.

But how? 

Try 1. I purchased some 700MB TDK CDR, with a view to burning the tracks onto the discs to become standard cd's.

But, as you know, traditional cd players, esp this one, ONLY play Redbook cd's. And the files of these cd's are .CDDA. So I started to convert the files using an online service and it delivered me a .cdda file. All good, I guess.

Then I went to 'test it' by trying to play the single .cdda track I had back on my Mac. Nothing would play it. Nothing. Not VLC, Not Apple Music. Nutz. Test 1. Fail.

Probably, I need to convert whatever the CDR will hold, probably 18-20 tracks and then burn them onto the CDR, run over and insert into the cd9 in the living room, and push play...

Now I am thoroughly sick of thinking about what will it take to play these great tracks through the CD9.

As far as the digital inputs in the CD9, the only media player I have right now is a spare Apple Macbook Air that I could probably use. I have a nice USB cable... but the MBA is not an ideal and potentially noisy digital player. It is what it is... I also have an Apple 4K tv not in use, if that helps?

Does anyone have any thoughts about driving this pursuit to completion? Especially how this can become a longer term solution for all my digital files to play through this analog (and DAC) CD9 unit? 

The options seem endless yet the experience is also start-less! Oh, I do have my LG tv optical connected to the CD9 to play Tidal, not too badly.