Just found out there is a new D200 coming out in a few weeks called D200+, it will have balanced amp output (3.5mm TRRS) and native dsd as well. It will only cost $20 more. It's fully balanced topology from dac output through to amp and vol pot, should sound pretty darn nice:
https://world.taobao.com/item/543222365841.htm
Below D200+ on the left and D200 V4 on the right. Basically the D200+ needs double the output opamps, double the output transistors, double the output capacitors, and double size volume pot (balanced), to achieve the balanced output.
And as you can see there is always trade-offs inside every dap, there is only so much you can do with a limited space, by needing 4x capacitors they have had to use smaller ones than original D200 as well as no longer able to change the LPF opamps, stuck with OPA2134 which is pretty good but not awesome.
As a result, listening in single ended would actually sound better on the D200 V4. But I'm pretty tempted to get the D200+ for Class A Balanced
The only other dap with Class A Balanced is Pono, another great dap I happen to own.