In the BDP 95 model, the stereo output were obtained from 4 + 4 channels (4 channels connected together). This assured max accuracy for the stereo signal in BDP95 model. In the upcoming BDP105 it seems that Oppo used a configuration for ESS9018 which assure 2+2 channels for balanced/unbalanced output, and 2+2 channels for headphone output. I`m not very sure about the allocation is strictly in this way, but is very sure to me that the Sabre chip is hardware divided between RCA/XLR output and headphone output.
Personally I`m quite critic to this design. I should want that one could have the possibility to use 4+4 channels of the chip for both (switching) normal out and headphone out. This way could assure the max accuracy in both cases. When one use the headphone is no any reason to have half part of the DAC chip hardware dedicated to another output which is not in use, and opposite. This judgement is made as a consequence of what is to be seen in the high resolution inside picture of 105 model. Oppo are welcome to correct me if I have seen wrong in the picture, or to precise more on this aspect...
It seems that this player model have a better distribution of the analogue power supplies and regulators on the boards. Having two dedicated outputs from the toroid transformer it make the PSUs more efficient and it assure less heat dissipation inside the enclosure. This design it were already a must for the 95 model, and it looks like it is implemented now in 105 model.
How can you tell from the picture how they are allocating the channels between the unbalanced/xlr and the headphone output? I was trying to compare to the pictures of the 95 but can't trace where the DAC outputs are running for either. It would be disappointing to learn they reduced the channels for the unbalanced/xlr outputs for the sake of the headphone amp.