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In Reply to: RE: "extending the lower bass of the panels" ... posted by Roger Gustavsson on March 13, 2017 at 23:53:43
It's a beautiful room, but a terrible one for line sources (and probably anything else, but mostly line sources). Line sources want a ceiling, they depend on the reflections from ceiling and floor to approximate an infinite line.
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So why do peoble use sound deadening ceiling panels? It is not common here in Europe and most acoustic Consultants do not recommend them except for placement just behind/above conventional radiating speakers.
With boxes, you'd normally put absorption on the ceiling at the first reflection point, which is to say a bit in front of the speaker. I'm not sure why anyone would want to do more than that, unless they're trying to lower the Rt of the room and they can't use the side or front and rear walls or perhaps if they want to suppress the reflection to a lower frequency, which wouldn't be bad except that there's a risk with a large area of making the room too dead.
Full-length dipoles are entirely different and you really don't need absorption on the ceiling or floor, or want it at frequencies at which wavelength becomes large compared to driver height.
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