Do you think that you are hearing aliasing or the phase shift introduced by the brick wall filters, which are there in an attempt to prevent aliasing?I know it was audible in the old days. I've not run a test recently to tell if its still a thing.
How I did it years ago to prove that I was not making it up to the pro-digital guys is I recorded a 20-20KHz sweep tone from an *analog* sweep generator, set to a slow sweep. The playback contained what is known in the analog world as 'birdies', chirp tones that were present along with the actual sweep tone. They are interactions with the scan frequency- IOW, aliasing. But in any other world, they are distortion, also known as 'inharmonic distortion' since they are based on the scan frequency and an interaction with the fundamental tone, and IME a special case of IMD.
So very easy to hear as brightness, since the ear converts all forms of distortion into some sort of tonality.
A bit of the aliasing is built into the recordings, so no matter how good your playback is, some recordings will have more than others. I think the pro audio ADC I used simply was not that good, but it was a long time ago and certainly made the point, since it was also a popular unit.

