The supposed sound bouncing off the ceiling in nat. statuary hall sounds electronic to me.............

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Parabolic loudspeaker - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Parabolic_loudspeaker

Wikipedia

Jump to Parabolic reflector - In a parabolic reflecting loudspeaker, one or more speaker ... The sound is bounced off the parabolic dish and leaves the dish  ...

Architecture - Volumes 3-4 - Page 260 - Google Books Result

https://books.google.com/books?id=pKxaAAAAYAAJ

1901 - ‎Architecture

Brown & Barrow, Architects. ... body such as a tuning fork in the mouthpiece of a speaking trumpet or parabolic reflector, the sound will be conveyed to a distance  ...

The dictionary of architecture

https://books.google.com/books?id=lJJZAAAAYAAJ

Architectural Publication Society - 1887 - ‎Architecture

1872 ; Statham, Architecture — in Reference to Sound, 20 Jan. ... London, is a sounding-board in the shape of a large parabolic reflector, about 12 ft. in diameter  ...

Sound Reflections in Auditoriums - HyperPhysics

hyperphysics.phy-astr.gsu.edu/hbase/.../reflc.ht...

Georgia State University

Any time the surfaces of a room focus the sound which is reflected from them, ... to be avoided because of the prominant reflection which will be produced. ... In modernarchitecture with its flat expanses, it is necessary to design in ... All rays from the focus of a parabola to its surface will be directed outward as parallel rays.

American Architect and Building News: 1876

https://books.google.com/books?id=PwFaAAAAYAAJ

1876 - ‎Architecture

The American Architect and Building News. ... The American Architect ... that twoparabolic reflectors placed face to face re-enforce any sound in either focus.