I have that amp too; my second amp purchase ever (after a Fiio E11).
Paired it with a Colorfly C3 and a pair of Audeo Phonak IEM's.. my first audiophile setup
I still have the amp, and it still works, but I only ever imagined it would have a negative effect on the DX200's sound if I linked them together..
Don't get me wrong, I did like the C&C BH 2 amp, but I imagine that adding it to the DX200 would be like linking a Lamborghini up to a caravan
(DX200 = Lamborghini in this analogy. Just to be clear)
I think what iBasso have done with their AMP units is fantastic. If you haven't already, I'd certainly suggest trying those headphones with AMP3 or AMP5; I'd imagine they do have more than enough 'juice' for most products?
On the other hand, if you do find the C&C amp to pair well with the DX200, do let me know; I'm open to new things
As a brief aside, I wonder if anyone ever *has* hooked up a caravan to a Lamborghini? I'm off to search Google images