Oppo BDP-83 optical out for 2ch stereo from blu-r?

Here's what Oppo says in the manual:
"Due to bandwidth limitations, high resolution audio formats such as Dolby Digital plus, Dolbt TrueHD, DTS-HD High Resolution and DTS-HD Master Audio cannot be sent through the coaxial or optical digital output. A reduced resolution version of the same audio track will be output instead."
Also:
"The stereo audio out terminals (analog) will always provide a down-mixed stereo signal from multi channel sources. The "Down Mix" and other speaker settings in the Audio Processing Setup Menu do not affect the (analog) Stereo Audio Out."
And there is this from Oppo's customer service:
"For the best audio in a two channel configuration you will want to use the dedicated stereo output of the BDP-83. Digital coaxial or optical will use the lossy, Core Dolby Digital and DTS from Blu-rays, which is inferior to the DTS-HD Master and Dolby Digital TrueHD you can get from the analog outputs."
I take all this to mean that there is reduced resolution audio from the digital optical output. Now, that digital output would surely benefit from being processed in an outboard dac. However, they are also saying that lossless formats such as Dolby Digital True HD and DTS-HD Master can be output through the analog stereo outputs, but through a downmix if the original format was multi-channel. Obviously the only way to put this to rest is to do an A/B comparison, AND one has to make sure that the settings in the Oppo's audio menu are correct for each format.
BTW, SACD will play through either HMDI or the analog stereo output connections only.

Am doing the A/B listening now, connected the analog outputs with a 3m pair of Kimber Hero's. So far, the toslink into the Weiss Dac2 (it does have a toslink input after all, duh) sounds better than the analog output direct to the preamp, which does not utilize the outboard Weiss dac. When you switch back & forth, the toslink connection is quite a bit louder and I have to adjust the volume as I do so. The toslink connection sounds more dynamic, I would imagine due to it's connection to the dac. The analog connection seems a little more laid back, possibly with a bit darker sound. I'll have to do some more listening, and be sure my audio setting are correct.
Thanks to all!

Thanks for opinions. Can you all suggest me which is the best matching external DAC for Oppo bdp-83 to use hi-rez audio.

Don't bother. Get the Oppo BDP-83SE with the ESS DACs.

Kal

Kal, may we know what's your overall opinion about the BDP-83SE? Thanks