First "higher end" IEM is the UE900..... it's very much V shape sound while this is neutral plus sub bass, perhaps even midly U to some who might find the treble hot (it's at a decent spot to my ears).Any UE900 current or former owners able to share some thoughts comparing & contrasting the two? Thanx.
While I can't comment about the B400 in production capacity, the one I heard (before it was released) had a V-shaped tonality as well. So it's apples and oranges to me.
Can't comment about the Vibro ones at all, never heard them.