I'm hitting a brick wall right where I suspected I would: High Frequency Extension. I have minor tinnitus too (played drums in a band, went to many loud concerts, rode a motorcycle without earplugs for a while, etc) and this is my weakest area. I literally can't hear the difference between the original and the most drastic difference on that section. They say it's most noticeable in the cymbals and then they play a song with no cymbals. :-/
I'm not even going to bother trying the test part if I can't hear the difference in the demo section.
But I am going to try again when I get home with my HE-4, which have crazy treble. That might help...
Okay, tried at home with the Q701 and the better DAC and it was much easier! lol