[OT and further discussions probably can continue on the Apple thread[/OT]...
but I have successfully played AIFF 24/192 off my iPad that's sync-ed manually from iTunes - no magic, no JB-ing, and all Apple software used. This was output on headphone out, and on desktop DAC (with digital display) that confirmed it was receiving hires from the iPad.
Meanwhile zachchen1996 is right that with the Onkyo Player it can output DSD native to an external DAC such as the Herus.
Meanwhile with regards to Android, I find that's where I have limitations as there's no standard to their USB Audio (or if there is, it's not adopted by all the various Android flavours by phone makers). UAPP seems to be an interrim solution to that but it's proprietary nevertheless. And there's still no native DSD support on Android still.
I've left clickable links to carry on this conversation.
Back on The HDP-R10, I'm not surprised the R10 "outperforms" the AK120 as for me even when I owned the DX100, I preferred it over the AK120. I bought the AK120 anyway 'cos the DX100 GUI wasn't to my preference. I'd gather the R10 was the same.
About DSD, I hope readers understand that just because an album says "DSD" it doesn't mean it's automatically better. There are various qualities to DSD depending on it's mastering. Some DSD vs PCM aren't discernable, whilst others are more easily discernable. It cannot be generalised that all DSD albums are better than their PCM equivalents. If one were to go back to the hard format of DSD days (i.e. SACDs), google up Norah Jones' "Come Away With Me" and read up about it's CD, SACD in 2003 release, and again it's SACD in 2012 release. There's a reason why the SACD was re-released in 2012.