I made some demo files.
https://drive.google.com/open?id=1kodOlklHbIAUD3k4ISalRz_Ma4BvqgPu
original.flac: original 16/44 file with very close to 0dBFS peak
[low peak float]: peak normalized original.flac from -90 to -120dB and saved as 32-bit float
[low peak 16bit]: convert files in [low peak float] to 16-bit
[+60]: add 60dB gain to files in [low peak 16bit]
So, after trying the files, find some CDDA rips or hi-res files with meaningful (music, voice, or anything you regard as "details") and unprocessed (e.g. digital fade) contents as loud as original.flac and as quiet as -110 16bit.flac within the same track.
Also, listen to original.flac and -110 16bit.flac alternately without touching the volume knob.
These are not blind tests, but I just hope people can actually listen, before digging too much into numbers.