They do sound fine, the problem comes when I turn them to their maximum volume, I'll give them a point, they do sound pretty much two or three times more louder than any other of my iems, so maaaybe that could be the cause of the silibances?, maybe.
I know, I actually never do, but I had to try.
My sources?, well, the silibances appears only on two of my devices, my notebook and my ipad (air), they sound right in other sources, or at least I haven't noticed so many silibances.
If you guys wanna do a try, try with this song
I know youtube quality is **** but pay attention to the girl voice, and if you guys wanna go forward and be sure, download the song on 320, V0 or flac, the silibances, at least for me, are still there.