[LAD] A Cathedral in your backyard

Jens M Andreasen jens.andreasen at comhem.se
Wed Apr 25 07:15:35 UTC 2007

After looking closer to Xaviers 'Allosphere' I doubt that it would be
possible to do the "acoustic experiment with a dome to demonstrate
positioned sound coming out of thin air" that I suggested. You'd need a
dome made out of marble or concrete to do that. It all depends on the
sum of reflections, so any acoustic dampening or slip thru would lessen
the effect.

What I think would be possible as an experiment though (without
involving a budget the size of the Pope or TU-Berlin), is to place a
large amount of uniform speakers in a circle and then feed them with the
same monophonic signal. If everything works as expected, it should then
appear like the sound emerges from the center of the circular array of

* The speakers could be a collection of ghettoblasters and kitchen
radioes with fresh batteries. 
* The signal could be a local radiostation (hey, this
is /wireless/ :-). 
* The location could be a park or a stadium in your city.

Would that work? 

I am convinced that it would really surprise everybody involved - in a
positive way - if it did. But if it doesn't ... Then one would have 200
buddies carrying ghettoblasters in hand staring suspiciously at the
initiator ...


On Sat, 2007-04-21 at 13:24 -0400, Eric Dantan Rzewnicki wrote:
> On Sat, Apr 21, 2007 at 12:05:02PM +0200, Jens M Andreasen wrote:
> > On Sat, 2007-04-21 at 01:53 -0700, Xavier Amatriain wrote:
> > 
> > > Incidentally, my main project right now is the design of such a dome 
> > > (actually it is a complete sphere, which
> > > will have 500+ speakers):
> > > 
> > > http://www.mat.ucsb.edu/allosphere
> > > 
> > 
> > Whoa ... Me thinks you have more impressive hardware than the Pope!
> > :-D
> The system at TU Berlin is 105 pannels. Each pannel is fed 8 channels.
> Each channel has 3 small drivers and groups of 4 channels are mixed
> down to 2 larger low frequency drivers. So:
> 105 * ( (8*3) + 2) = 2730 total loudspeakers. 
> You can see most of the room here:
> http://www.kgw.tu-berlin.de/~lac2007/TUfotos.shtml
> There was a photo there of the whole room before (several panoramics
> stitched together.) Not sure if it's still up somewhere for viewing.
> -Eric Rz.
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