I'm long overdue to write a review or post a video.
I contacted Audeze in regards to converting my XC to X as I no longer need the closed back and prefer something a bit lighter for long work day listening. Their response was you cannot convert from the XC to X. Would have assumed you just unscrew the wood cups, fit some damping and screw on the grill.
I have a pair of these arriving this week to go with my Sennheiser HDVD 800 headphone amplifier. I went to a dealer with the intention of spending £1k but none of the ones I tried (Audeze LCD-2, Sennheiser HD800, Grado GS1000i and a few others that I can't remember!) were much better than my 10 years old Sennheiser HD580. Just to see if an extra £500 would make much difference, I tried the LCD-X and it had all of the good bits from the other headphones and none of the downsides.
The X has stellar synergy with the Chord Hugo, sounds just phenomenal. And the Hugo powers the can splendidly straight from the unit. See Hugo post for further impressions.
If you go for desktop headphone amplifier I would recommend Yulong A18 which I am now using. The price is quite reasonable and the SQ is excellent and powerful enough to drive any headphones, including HD800.
I bought a used pair of Toxic Cables Venom 18 AWG pure OCC silver cables from a fellow head-fier. Great build quality! They are a little bulky and stiff but that doesn't bother me at all. The soundstage expanded a lot, highs are cleaner and clearer, and the bass doesn't kick as hard but still satisfying. They are the first cables I have ever bought so I have to say I believe in aftermarket cables! I will post pictures soon.
You can get the A18 from Europe and for European voltage, as well as interesting alternatives of Audio gd, from http://www.audiophonics.fr
That is also what I wanted to say, A18 is available in the EU and as to Audio GD it is also an excellent headphone amp and pre-amp.
You may wish to see the built quality in the following link: