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Spaces with unusual acoustics, long reverb, echo's etc.

Subject: Spaces with unusual acoustics, long reverb, echo's etc.
From: "Scott Fraser" scottbfraser
Date: Sun Dec 30, 2007 10:33 am ((PST))
<<I'd love to hear some of your recommendations/rumors about  
locations with unusual
acoustics, long reverb, echo's etc. Doesn't matter where they are.>>

Just north of San Francisco in the Marin Headlands National Park is a  
complex of abandoned coastal defense artillery emplacements. These  
are connected by a series of tunnels big enough to drive two army  
trucks side by side through to supply each gun. Several of these  
tunnels are as much as a quarter mile long, concrete, with a  
rectangular cross section. The reverberation in there is quite  
spectacular, very non-diffuse. A number of side chambers lead off the  
main tunnels.
I recall running across a location on the SUNY Potsdam campus where  
two perfectly parallel concrete walls face each other across a small  
courtyard. At the focal point the reflections are separate & non- 
diffuse & ring for an extraordinarily long time.
A couple weeks ago during a concert set up in the Palacio De Belles  
Artes in Mexico City I noticed the upstage area, 100 or so feet back  
of the proscenium, provided a highly resonant metallic comb-filtered  
set of reflections, normally associated with electronic flanging or  
phase shifting effects. Generally any complex curve leading to a  
reflective surface, as often found in theatrical spaces, especially  
those insufficiently diffuse ones which I would describe as not  
particularly well designed acoustically, will provide some version of  
this effect.
Generally highly reverberant spaces are man-made & result from large  
flat reflective surfaces without much diffusion, or enclosed spaces  
of simple geometry, but there certainly are natural instances as well.

Scott Fraser

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