So, what do we have here? These are the rankings of the headphone amps I've tried so far with the LCD-Xs:
1. EF-6: while tied with the Darkstar in every department, it is close to 2K cheaper! This one is a no-brainer. If you got's the the dinero, blindly take the leap...it will also drive your HD800 and T1 to perfection.
2. Darkstar: amazing, but way too expensive...get the EF-6 and you'll be missing nothing (i.e., since the use of balanced interconnects with the EF-6 is not possible - only RCAs - I am thinking that the great sound of the Darkstar has nothing to do with it being fully balanced...it's all about the power, baby.
3. Mjolnir: the surprise of the day...if you are on a budget and want to have the LCD-Xs shine, go for it, but get a good copper headphone replacement cable...you won't regret it. If you are in an even tighter budget, just get the Mjolnir with the LCD2s...The two together sound amazing, even with classical music...this is the first time in my life when I've heard the LCD-2s presenting a respectable soundstage and a fairly extended treble. The LCD-3s with the Mjolnir must be magical, by the way!@.
4. Don't wast your money with the Burson if you want to drive the LCD-Xs (now, if you want to drive the TH900s, Beyer T5P, Ultrasone Ed. 8, and Audio Technicas of the world, do get it, since it is a glorious and relatively affordable amp; just don't expect it to make water into wine when it comes to the LCD-Xs...sounds good, but there are much better choices.
5. Decware Taboo: the jury is still out since I have much tube rolling to do still, but I would tend to agree with the venerable one (i.e., Macedonian Hero) on this one: Orthos were not made to be played by tube amps!!!
6. HeadRoom Ultra Desktop Amp: foggeddabouit...doesn't do enough for the money you pay...let's just leave it at that.
As you can see, the more powerful the amp, the better it drives the LCD-Xs. These may be efficient and all you want, but they do like it when driven by a couple of dynamite sticks.
I hope these "vignettes" have been helpful to the head-fi community. It has been an honor!
Sincerely,
Figaro
P.S. - using Oppo and Marantz SACD players all the way...no compressed music in this neighborhood!