The nominal speed of your network service is an upper limit which does not guarantee any particular average speed to any arbitrary site. There could be a lot of traffic on the path between you and the Netflix server you get assigned to.
Yes, I think my first test was a victim of Netflix getting bogged down ??
I tried your test movie Ong Bak 2 and went to a scene with bright high contrast.
I could not SEE a difference between the stereo & DD 5.1+.
Went back and tried my original Scandal TV show and still could not see any difference.
Went over to AVS forum where there is a PS3 page and saw a Netflix test clip "example short 24.976".
You want the one with nothing else in the title since there are several.
This clip has an overlay that changes with each bitrate & resolution and is in several languages both stereo & mono only.
After about 20 seconds I ramp up to 4800kb/sec & 1920 x 1080 (Yes sir !!).
If I change the roku to 720p output it stops at 3600kb & 720p resolution so Netflix is looking at what your Roku 2 XS is set for.
The video short has a cross hatch test pattern near the end that really pops when it switches to 1080p.
I'll try a few more tests as I watch things but I think it is safe to say that there is no difference between 2 & 5.1 streams with the roku 2 XS.
Of course this would be much easier if you could just push a button and it would tell you what you have comming into your box !!
But weren't you the guy with the Bose system whose speakers can't be used with another AVR?
No, not me. I don't own an AVR and this Roku 2 is in my upstairs bedroom system (samsung 7000 series LED/LCD, 2 channel Hifi rig).
My downstairs system is the Roku XDS, Pioneer Kuro plasma (only 720p but still kicking) and > $10k of high end Hifi components.
Nothing Bose here !!
Thanks again for all your help