Well I found a smoking deal on an LCD-4 near where I live. So I sold the MX4, sadly. I am saying "sadly," only because I did really like the MX4. The good news, however, is that I now have the LCD-4 and LCD-X (not to mention the LCDi4), and I'm no longer haunted by any too-close sonic resemblance between any 2 Audeze cans in my stable, because they each have their own distinct character, even though they share the Audeze house sound. It just so happens that I have also found the LCD-4 to be very enjoyable--and I mean, enjoyable beyond-my-initial-expectations-going-in--and that has more than made up for the missing MX4. Those expectations were colored by some reservations expressed in some reviews I had read about the LCD-4 before getting to own it, particularly reservations regarding its allegedly "problematic" treble. Luckily I am not hearing anything "problematic" about the treble on my unit at all. On the contrary. And don't get me started on the mind-blowing bass and the mids on this unit! Let's just say that I am now feeling quite content with the cans I have, thanks to the LCD-4, and also the i4, to be fair, to the point where I am no longer dreaming too much about going after others. This almost-zero nervosa state of contentedness is at once strange, and strangely satisfying. I do not know how long it will endure, but we shall just have to wait and see. I rarely ever write formal reviews of headphones, but i think i am going to make an exception this time, after I have familiarized myself enough with all the nuances and niceties of the delights the LCD-4 can produce.