Well, it might be commonplace. But my Hugo2 does a great job with the X. I've also used them with the Questyle QP1R with good results. I know the CMA800R was designed to supposedly complement the HD800. But, if it's equivolant to the QP DAP in its current mode sound, it could be your best bet.So I just bought some 'B-Stock" LCD-X from Moon Audio, they'll be here day after tomorrow. Seemed like a deal at $899 delivered so hopefully I won't regret spending the extra $300 for the new retail 'Creator Package'. These should be huge upgrade over the Shure SRH840 phones I've had for many years. For the money I thought they were quite good but they have seen rare use since I got the JH13Pro IEMs may years ago.
I believe these 'B-Stock' Audeze will have the new headband, memory foam ear cups, and braided cable. I'll pick up another cable (Moon Black Dragon v2, maybe Norne Solv or Draug2) but want to get used to the LCD-X with the factory wire first, which will also give me time to pick the appropriate connector should I change amps. I have a Corda Symphony DAC/amp which I'm hoping will work okay with the Audeze - it accepts the factory cable 1/4 plug. It's obviously long discontinued, based on its age I assume there are much better options out there now. So, what DAC/amp combos others have found that work great with the LCD-X ? My budget is fairly flexible, I'd consider anything from the Micca OriGen, Audeze Deckard to Questyle CMA800R. Maybe the Topping DX7S ? Seems like the LCD-X should be fairly easy to drive based on their specs.
Source will be digital files stored on a MacBook Pro via USB. I use an Aurender N10 in my big rig so will give that a try too.
@MattTCG and @project86 are familiar with the Questyles as well as other amps. Maybe they'll see this post and drop in with an opinion for you.