BTW, I haven't done double blinded testing either, by I did some MP3 testing at various bitrates with various decoders. I found that I could not consistently tell the difference with my own mid-end stereo equipment between a CD and 256 Kbps Fraunhofer iTunes MP3 encodes. There might have been occasional clues, but it was very hard to identify those consistently. 128 Kbps was easy to tell apart, at least on some material though. So, from that era, I have an awful lot of 256 Kbps encodes. Then when AAC became more popular, I found that the sweet spot for me was 192 Kbps AAC. So, the rest of my music collection was encoded at 192 Kbps AAC.
One thing I've also noticed during that testing period is sometime in the last 15 years, surround-like effects in some pop songs started to become much more common. Audio salespeople started using this to their advantage, by only playing this type of music with cheap speakers. Some undereducated buyers would marvel at the music's "presence" even with these small speaker systems.
Meanwhile, my friend's brother had a system worth 5 digit $, but I just shook my head because he was still living at his parents' place, with the entire system in his smallish bedroom. He played some SACD for me on that system, and I kept on telling him I was unimpressed.