Q. What do I need to watch Blu-ray?
A: Other than a BD player, you’ll probably want an HDTV, to get the full quality and widescreen effect. (When watched on a older, standard-shaped tube set, the image is severely letterboxed with dark bands above and below.) Before buying a Blu-ray player to connect to an older TV, check the player’s back panel: Not all have the kinds of outputs needed to connect to older sets. Most players send audio and video to newer TVs and displays via a single cable called HDMI. And don’t get caught up in the various flavors of HDTV — 720p, 1080i and 1080p — because Blu-ray players can send an HD signal to any of them. As for screen size, most viewers won’t get much benefit, Bracke says, unless it’s at least 40 inches (diagonally).