So, what are you driving them with? Mine are coming in tomorrow and I'll be driving them with the Ray Samuels Dark Star, which does amazingly well with planars (after all, it was designed with THE MONSTER (i.e., HE-6) in mind. Maybe lots of power in reserve could make them sound great even at lower volumes. I'll let you guys know how it goes.
Mostly my Mjolnir, but the Vali as well. The Mjolnir delivers 8 clean watts per channel into 32 ohms and the LCD-X is 22 ohms, so unless the X needs dilithium crystals, there should be power to spare. The LCD-X has somewhat better low volume performance than the LCD-2, but Audeze cans really open up at higher volumes.