[sonitus mirus]

 
Thanks for all the info. I am not sure I understand it totally. How would you describe the audible differences in the tidal test? Is it just a matter of amplitudes of certain frequencies?

 
The audible differences sound exactly to me as the graph shows in this post:
 
http://www.head-fi.org/t/743658/tidal-lossless-listening-test-whats-going-on-here/15#post_11077298
 
I used a pair of Markl-modded Denon D5000 headphones that already provide a ton of bass, and with the volume raised a bit, I was able to hear differences between the two versions.  The file with a little more bass emphasis was the lossless version, with the AAC 320 version having a slightly lower volume for the bass.  I only concentrated on the bass, as this is easier for me to hear,  but the same issue appears for the treble from 5K to 10K.