Interesting comments on the treble. I may need to go back to Mahler's first. I thought there was some harshness in the latest movements, but then again I thought that was in the recording itself. I have relatively few hours on my unit, and did not perform the recommended break in. So what I am wondering is how will these sound after extended wearing? The reason I ask that is one of the hottest threads for IEM units is the $100 It01. Yet it appears that one needs over 100 hours (maybe 150?) before they sound right. So naturally my question is how does the A5 sound after extended use? The same or ..... ?