This is true however I no longer have the dx50 as I sent it back to ibasso. It is still a great piece and once the firmware issues are resolved the only other issue is the slight hiss with sensitive iems.
I have never owned a fiio dap and likely never will. I am not a fan of any of their dap layouts that I have seen.
I loved my cowon S9 and J3 however the D3 Plenue wasn't much to write home about.
After sending the dx50 back I ordered a Hibino hdp-r10.