1. Yes - The Oppo DACs are pretty good stuff. It would certainly sound different. HDMI or optical would work, digital coax as a last choice.
2. Yes - Again, you'd be using the Oppo DAC to process the signal vs. the MX135 set.
3. Not sure on that one, Ed. Are you talking video or audio? If for video, I'd suggest you give it a shot and see how it looks to you. I'm not sure if the Oppo upconverts or not. I suspect it does.
Good luck!
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Michael 4K QLED|Aerial Acoustics|McIntosh D100 - MC501 - MX151|Bluesound|Schiit|Wyrd4Sound
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