edit: I just checked the manual and got my answer. Manual link indicates that "OPA627*2, BUF634U*4, and BUF634P*4 are mounted on the P5" http://ibasso.com/uploadfiles/20150815/201508151829012550.pdf I think ibasso site has compatibility issue with chrome.
I think it is only the diamond black which is available.
I tried ordering but non of then accept orders from overseas.
I find mid-fi gears offer a far more exceptional performance than their higher end products.