It's been a while since I did this, but I could pass an abx using the foobar tool between any bitrate mp3 and lossless, this was using speakers. I didn't listen to micro differences but macro things, to me mp3 sounded 'messy', and once I was turned in I could hit X and immediately know the answer. All my testing was done with 1979 by the smashing pumpkins, I chose this because the MP3 sounded wrong just playing it, same as a lot of mp3s did, and thought I'd be clever and prove the difference vanished in a dbt, it didn't.