I vote for at or slightly below eye-ear level, but it is personal. Your environment may not accommodate that. For instance, if you try the popular above-the-fireplace location you would need to sit in a very high chair (unless you have a very short fireplace).
I'm not sure if slightly higher would be a real problem. When I am in coach patato mode, I have my head back on the coach and am in a slight reclined position, so I am naturally looking up at about a 10deg angle, not sitting up as if I was at a table. Also, I you can adjust eyes up 5 - 10 degrees as apposed to moving my head...... reason being as fizbin said.....I am going above the fireplace....
I am no expert on this, but common sense suggests eye level centering.
Consider the ergonomic (sp?) issues. We have all heard of sitting properly at our desks to avoid the onset of certain injuries. The same can be said of TV viewing. If the screen is too high, then you will incline the head. Over time, this could lead to neck problems.
That being said, my requests for info on this from the forum have returned answers of 30", 36", and 42". The 30" would be consistent with eye level, but the presence of other uses suggest whatever the user is happy with.
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