Originally Posted by JerryL
{adding to this a little while later}
I poked around their website and this might be of interest:

http://www.oppodigital.com/blu-ray-udp-203/blu-ray-udp-203-Features.aspx
Quote
Dual HDMI Outputs
The player features two HDMI outputs – an HDMI 2.0 port for connecting to the latest UHD TVs, projectors and A/V receivers, and an HDMI 1.4 audio port for connecting to older A/V receivers. Customers with newer 4K- and HDR-capable A/V receivers can use a full HDMI 2.0 signal path, while customers with older A/V receivers can have a split A/V setup.

So it appears if you have a 4K device or HDMI 2.0+ device, and if the output of that device is a format that is newer than what the HD621 can handle, the 203 can also help you by bringing the audio "down" to HDMI 1.4. As an aside it might be worth while to see what you think about the Oppos decoding to LPCM. If memory serves, most DTS MA and Dolby TruHD on Bluray are 48khz- and I think the HD621 can upsample to 96??

I wondered what devices this could cover. Kaleidescape 4K? No it has a 1.4 HDMI out for audio. Apple TV? No, its not 4K yet and is 1.4 also. Roku 4K? It seems that would qualify. Maybe other streaming devices?
Many thanks for your detailed and helpful post. You have confirmed what I suspected. I shall be interested to hear what you make of the performance when you have had a chance to get beyond first impressions.

Asa Post