The Oppos are primarily BD-players with SACD-playback support added. If you are after a single-unit multiformat player that supports multi-channel decoding of either media, for the asking price, they have a lot to offer.
Unfortunately, there is little net benefit in trying to offload native DSD stream processing to a multifunction receiver, unless your goal is to watch THX, DTS or whatever x.1 encoded movies. The reason behind this is that none of these units typically offer external high-quality clock input which can act as an effective traffic cop against jitter, the main enemy against high-end digital music reproduction.
At present, I have an ESOTERIC P03/D03/G-0x combo. I'm planning to upgrade the G-0x at some point to a Rubidium clock, which is about 1000 times more accurate than the PLL crystal clock in the G-0x, but it is still superior to have both the transport and the external DAC running on their own built-in clocks independently to each other.
As far as the connectivity is concerned between the SACD transport and the DAC, the only suitable option that allows native DSD streaming between the two components at a 176kHz clock frequency are the AES/EBU interfaces (an evolution of the old SPDIF standard). Firewire is also supported, however, it doesn't possess sufficient bandwidth for DSD processing, so PCM conversion at a lower sampling frequency is required, which defeats the purpose of investing in these devices the first place.
If you do not wish to invest in separate components, the company's new K-03 and the top-of-the-line K-01 single player units offer comparable performance. I had a K-03 and even it did not allow DSD streaming to the D-03 DAC.
