I have one like that, the d.c. resistance is virtually zero ohm.

Thank you for sharing your settings.   Got everything working now.

Has anyone been able to play DSD256 with Foobar2K successfully?

  I have my ear touching different part of the case and could not hear any such leak.   May be we need to start comparing serial numbers.    If grounding was the issue, Xduoo might have fixed it quietly so that those made more recently don't have this issue.

  My Nexus is running 7.1.1 so yours should work too.   You do need an OTG cable and they are readily available.   https://www.amazon.com/CableCreation-Female-Adapter-Macbook-Chromebook/dp/B0144GCXY6   https://www.amazon.com/dp/B018S827GU

  I also tried it on the Mojo and got the dark blue light so 192 kHz for sure.   Maybe the higher end phones and Android OS up convert to 192 when bit streaming.

  I tried it with the 6P, worked well and sounded good.   For some reason, the XD-05 would always display 192 kHz when the N6P is connected.

  Thanks, I am going to email them about it too.   By the way, in your post#734:     Was "sharp" a typo?   From what I read, slow is the one that has reduced pre and post ringing.  Sharp is the worse in terms of pre and post ringing.   https://www.ayre.com/pdf/Ayre_MP_White_Paper.pdf

  Did you get a response from Xduoo on the filter issues?   According to this link there should be 5 filters including a super slow, wonder why the XD-05 does not have it.   Also according to the Teac team, the slow roll off ones are for original sound, super slow for "natural" sound whatever...

My 6p sounds great even via BT but where do you get the manufacturing date from?   Overall it sounds better than iphone 6 plus and much better than the Nexus 4.