Andre, giving further thought to what the cable company tech told you, it had to be referring only to standard definition, not HD, channels. The HD channels can't come in as 480i, since by definition they're either 720 or 1080. If the Motorola box scales 480i up that still doesn't make it "real" HD. So I'd say that his answer was either limited to SD or was incorrect if he was also speaking of HD channels. For the HD channels the 1080i output on the Motorola should be used.

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Enjoy the music, not the equipment.