Regarding the feedback that the Mojo needed to be at full volume with the LCD-4 - checked today and Mojo does 250mW into 100ohm. The LCD-4 needs 100mW of power to hit 120dB.
No wonder my impression was that I had plenty of volume headroom.
I can confirm that out of my AK240SS in balanced mode, the LCD-4 sounds fantastic! But on my main rig (Hugo TT --> GS-X Mk2), the LCD-4s scale quite a bit higher. But if you're taking the LCD-4s with you on an extended vacation, they can (and do) sound great out of a portable setup too.