I like higher personally. They lift the soundstage, make the sound a little fuller than just right at ear level. Point them in from the sides, directly at the listener. Angle them down a bit too.
Sound deadening materials make a significant difference. All it needs to be is a thick (I mean, thick!) curtain right behind the listener. It can make a huge difference in eliminating echoes.
That's why there are huge tapestries in castles. They may look good, but you'd better believe they help get rid of echoes. Think of a bare church, and then think of a massive decorated cathedral. In the empty church your voice echoes forever and easily gets lost, where in the one with the decorations, just raising your voice a little lets your voice carry clearly to the other end. That's what you want.
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