After having tried different rom, I came to the conclusion that the only detail that I find is that almost imperseptible little noise is randomly generated when you have the phone in silence and try to play a sound, like when you open the gallery and played automatically on zoe one video album, and this is mute.
or when you listen to music through the speakers and a notification arrives, sometimes short for a millisecond the song, sometimes not. (if you have it in silence)
what happened to me earlier that while listening to music through the speakers and writing the song was cut just passed me with ARHD.
if not call problem, it is something that was more noticeable in my previous m7, but what I am sure of is that boomsound not pass, the end can not leave the audio quality Harman / Kardon offers.
One of my favorite philosophical tenets is that people will agree with you only if they already agree with you. You do not change people's minds.