Sorry, but this doesn't compute with me...no Audeze headphone has ever been U shaped. They are linear from 2kHz down to 20Hz. I'd definitely send them back. I doubt its a variance thing, I've talked to Audeze about this and they've made some great strides in this regard, but there is definitely something up with your pair...think LCD-XC, but with a more transparent signature and openness.
Edited by MacedonianHero - 5/31/14 at 8:43pm