I'll give you a certain thing at a certain time in a certain song:

Listen to the 4:41 - 4:53 section of 'Abyss of Time' by Epica, maybe do it with some low quality gear first, and then do it with higher quality gear. Do you notice anything that you haven't noticed the first time?

I love Epica, I've listened to that song about 100 times but it took me about 50 times and possibly different gear to hear the vocal there. That's an example of a detail to me. It's difficult to notice, but it's definitely there and has nothing to do with placebo.