3/6 using only my laptop which is on my lap while Top Gear plays in the background. I'll take it.
did it yesterday. 5/6 on a Nexus 5 with Klipsch image headphones. Ive gone lossless audio only since spring '14 for my preferred genres of the House and Techno. It makes a lot of sense for the genres when you have a proper sound system. I wouldn't do it for Reggae, Sofa, Calypso, or Hip-Hop
I have a really difficult time distinguishing between lossless and 320 kbps files, but maybe if I had a better sound system I'd be able to. But at that point it becomes a cost/benefit problem.
6/6 but I'm cheating a bit on my monitors. Running focusrite d/a into a pair of bx8-d2s alongside Yamaha hs-5s. You really only notice in the high end. The more you compress the more clarity you lose in the upper register ime.
3/6 using headphones and a high quality audio interface. Most of the time I was guessing. Honestly, I'm quite surprised I couldn't hear a clear difference between 128kbps and the other two. Either the mp3 codec has gotten a lot better, or my hearing has gotten worse (or maybe it was just placebo?), because I remember thinking 128kbps was complete shite, and almost all of my music is 256kbps VBR or higher now. Maybe this would've been a better test if they had a reference track for each (aka an ABX test)? Like, you could hear how it's SUPPOSED to sound, and then see which one of the three sounds the closest to the original. EDIT: Some people are claiming that the examples posted aren't very good, which may be the case, especially when it comes to the heavily produced pop tracks, but I felt like there was a lot of variety there.
5/6 with my $5 2XL earbuds coming from a quarter inch extension cord from my desktop computer. I've always had good hearing.
4/6 I got the Neil Young and the Suzanne Vega songs wrong. DOH! My ears suck though, they're pretty well shot at this point. I was sure I had the Vega one right though.... Fun!