Thanks for the more technical explanation. I guess at a more basic level I was thinking about the digital bitrate and level of compression applied to the data on HD1, and how using more bits for HD2 presumably has a negative impact on the quality of HD1. Like encoding/listening to a stereo MP3 at 128kbps vs. 256kbps vs. 320kbps.
It’s not digital: It’s Hybrid Digital! 😉