Sorry dude, I don't have the faintest idea what you're talking about. I listened to that song in the link you posted, I didn't hear anything even remotely similar to what you described. Neither have I heard anyone else complain of anything similar.
Whatever the defect is that's causing you trouble, apparently it is not affecting every pair of UE900s. I suggest you return your pair for replacement, it is most likely a sample defect.
Actually, he's the second or third person to experience that issue (reported through this thread :p). Knowing that the EQ helped, I think it deals with the spike that is at the 10k range. It may not register so well with his ears causing some audible anomalies.