Hadn't thought of that! Nice :)My delay idea is based on this concept so maybe less than 35 ms would be better.
how absorptive the wall behind the talker
Thick velour drape so reflection won't be a problem.
Two PAs, one for the speech, one for the show. Speakers by the lectern facing out, use the arrays that face away from the lectern as delays for the speech portion.
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