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I have a HR54 + 4Kmini located together at my Sony Bravia 4K TV with the 4Kmini only for viewing 4K sports on 105-107. I have removed all other DTV equipment in favor of using the DirecTV app for occasional viewing on smart TV's in other rooms.
the HR54 is 4K capable. Is there a reason you don't just use the HR54 directly? Nothing wrong with how you do it, just curious since it's a more complicated set up for (what feels to me) minimal gain.
 
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