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If you tv is a 1080p HD tv, it could receive Blu-Ray quality programing (1080p) through: Netflix, You Tube, using the 4K box on high-speed broadband over the Internet for now.
Comcast could offer 1080p (if it chooses) over linear cable in the future.
As long as the TV you are talking about has an HDMI input. The V4 DVR has only HDMI output.
If your TV doesn't have HDMI you would need an appropriate converter which Comcast would not supply.
Would there be any possible problems using a 4K X1DVR with a non 4K tv?