I can definitely tell the difference between a 128kbps or 160kbps MP3 and a 192kbps MP3. Once you get above that it becomes more a matter of how good the equipment you are listening to with is. In a car stereo for example with road noise etc 192kbps is absolutely fine.!
How did you come to that conclusion though?
Did you know which was which beforehand?
I don't question that you can do it, I'm just curious how you came to the conclusion. I can tell those differences fairly easily, and the difference between 320kbs LAME mp3 and FLAC, but I know that I can because I've done ABX testing with the same songs in different file formats using this
http://www.foobar2000.org/components/view/foo_abxThat told me that I can tell the difference, but while it wasnt that hard most of the time, it was harder than I thought and while the stats showed that I could, on the whole, tell the difference, I got quite a few wrong.
FWIW I cant tell the difference between the best Vorbis encoding and FLAC, but I thought that I could before I double-blind tested it :). Differences that I believed were there just vanished when the only thing I had to go on was purely sonic information, with no idea what I was really listening to. Granted I was impressed with vorbis beforehand and the differences I thought I could hear were small, but small or not I genuinely heard them...but only when I knew which was which before listening ;).
If you know which is which beforehand, you will be biased. You can't avoid it; you will actually hear differences that aren't there. You will still hear differences even if you are aware of perception bias.
With guitars, there is a feel-factor of course. But then, if your hearing can be so easily fooled by your eyes and preconceptions, how reliable is feel? You see a multi-thousand pound pricetag, and of course you expect better 'feel', but do you actually perceive there being a difference because you expected it? Bearing in mind that your interpretation of your sensory experience will be distorted by your expectation (you really will feel a difference if you expect to), theres no way to tell but double-blind.
The same sort of thing happens with wines as well.
http://www.theatlantic.com/health/archive/2011/10/you-are-not-so-smart-why-we-cant-tell-good-wine-from-bad/247240/