I just got the adapter and works fine (http://www.meenova.com/st/p/ua_c2u.html), i.e., the S8 recognizes the HA-2 SE as an audio devise and it would not charge it (I am using USB Audio Player PRO to have a bit perfect stream going to the HA-2 SE). Interestingly, the S8 in the quick access menu...

An update on the cable that Oppo suggested me to buy. It did NOT work, this other cable would not work either: https://shopmeenova.appspot.com/st/p/mbc_c2mu.html So do not bother to get them, I am sending them back. It is disappointing that Oppo suggest solutions that they have not tested and...

ok so, oppo got back to me on the issue of the DAC draining the phone, this is what they say: "You will need to use an adapter or a cable that is compatible with the pin-out Oppo uses with the HA-2SE. The previously linked to Meenova cable should work without drawing power from the Samsung."...

I have the same issue, and oppo response was that it is not a matter that they can solve, only Samsung. i also had my HA2-SE worked with your workaround (USB adapter), thanks for that. It does drain the battery and the phone controls to decide whether the usb connection charges or gets charged...