[uulbiy]

Similarly, I got 3 wavs and 3 320s. I could distinguish the 128s but not between the other two. Please note that I did this wearing studio headphones (shure srh840).

[eludwig]

Same here 3 of 6. I always spotted the 128, but the others were a coin toss. This was on an iPad (chrome browser) with Bose over-ear phones.