
In religious art and architecture, an abat-voix (from French abat-voix, or sounding-board) is a sort of canopy which is placed above a pulpit and which serves the purpose of reflecting the preacher`s voice toward the audience. ==Etymology== Borrowing from French abat-voix, from French abattre (`to beat down”) + voix (`voice”). ...
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http://en.wikipedia.org/wiki/Abat-voix

In architecture, an abat-voix is a sound reflector placed behind and over the pulpit of a church so as to project the preacher's voice towards the congregation.
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http://www.probertencyclopaedia.com/browse/TA.HTM
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