My room will be around 11ft x 8ft and around 8ft in height. With this in mind, and the fact I trying to pre-plan a 69" (diagonal) screen so I can position the front mid speaker at a suitable height (prior to plastering), what would be the best guide to fix the height of the screen? I don't want it too high that I get a kink in the neck but I need the front speaker at reasonable height as it's going under the screen. By the way, it will be a fixed 16:9 screen. Any ideas anyone?