OPPO 205 set up questions

I just received my Oppo 205 and have a few questions about setting it up, and need information on some choices in the set up menu. I running it with a Marantz 8802A . I amusing the 7.1 and 2 channel analog connections via RCA to the 7.1 connections on my Marantz.. In the 7.1 configuration I am using the 2 channel analog outputs to the FR and FL of the 7.1 configuration. My questions are the following of which concern the choices in the set up menu:


1- I receive 5.1 for movies and SACD's but cannot receive any 7.1 for movies? Not sure if I dont have somethingset correctly in the Oppo.


2-HDMI AUTO FORMAT- choices LPCM, bitstream, Auto?  


3-STEREO SIGNAL-Front Left/Right or Down Mix Stereo    

     not sure what this is about? or really how and what it effects


4-HDMI SPECS--1080p, UHD24HZ, UHD or UHD HDR   (I set mine to UHD HDR on a non 4K TV)



I love the video and sound quality. I was really impressed and it blue away my Rotel 990 cd player and my Pioneer DV 47A SACD playerwhich were pretty decent stuff 20 years ago. OK I'm a little slow to catch up and replace my gear!!   thanks in advance for your advice.

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I just received my Oppo 205 and have a few questions about setting it up...

You would be well served to search this thread and/or post in the avsforum.

I have an Oppo udp -205 and was looking for the best way to connect my iPad or I phone to it to play music ?
Can iPad/iphone do Chromecast? If yes, then get a Chromecast audio, hook a optical "out" from Chromecast to optical "in" of Oppo and cast your music.
I Use Roon Audio to stream music t0 Oppo 205, Not sure on the 8802 for sound quality-DAC, Try using the HDMI via Bitstream, let the 8802 do its thing. Compare that the the analog outs on the Oppo.I found the Analog outs have a very nice warm sound sound, if find your DACs in the 8802 are too bright. You can do the same for movies.