I only had time to check the first 7 samples and I could barely notice (or imagine) a teensy tiny spec of difference in two of them.
In my experience, in most music styles and with modern encoders, even 128kb can be indistinguishable from loss-less, let alone 320kb which I think is biologically impossible for adult ears.
now It also depends on the gear you have, some headphones and amps might emphasize on the freqs that poorly encoded mp3's have artifacts in?
Thanks for trying, anyway! I hope you feel like going thru the whole test some other time so that I get your records for the collection. I am totally unable to hear the differences in the tests myself. Notice there two tests, each one with a different approach. You may want to take a look at the second, where you can pick a clip from a choice of 6.
Edited by cdvsmp3 - 6/9/14 at 1:09am