On 2013-04-26, Augustine Leudar wrote:
no, no its interesting - so you dont want room modes etc .
I want them, but I want them controlled. Not controlled as in we just
sort of mitigated something somewhere. I want them controlled like
blood, and guts, and the Final Solution.
I ask because although its ridiculous tor try and build anything in
the west - in Peru the opportunity exists of building almost any
shaped room you like for under a 500 euro - they use adobe with a nice
finish. I always though I might build on one day - but could never get
a straight answer from anyone as to the ideal shape - you have
remedied that somewhat.
In that case, I'd actually better reword my stuff somewhat. Towards what
they can actually build at a reasonable cost (a *high* but reasonable
cost). With rationale to follow, so that you can choose the design
principles and techniques yourself.
1) Never go with a symmetrical shape. Go with easily built highly
asymmetrical shapes, so that all but direct sound bounces around more
than once before reaching you. That way you have more wall area and time
over which to control its final arrival.
2) Utilize the next set of tools to control high frequency arrivals:
2a) Multiple specular reflection, leading to spectral rolloff via
atmospheric traversal length.
2b) Absorptive material on the walls, and traversable cloth 1/4
wavelength off the surface to absorb velocity.
2c) Acyclic dispersers on the wall, with selfsimilar grain. They make
both the time arrival pattern of a waveform more even and let the rest
of the dispersed means work better+over a longer time.
2d) Acoustic metamaterials. They can add imaginary impedance to your
soundwaves, and some of them are also pretty simple. Give me three
heavy curtains and I'll build you one.
2e) Open and/or prepared enclosures from your space towards the
outside. This stuff is how you trap the lowest frequencies.
2f) Electronic correction. Works every time for LF where nothing else
works.
Im sure theres a way you could do it here cheaply with polytunnel
material etc - of course youd be getting outside noise, but if ou
lived somewhere quiet.....
Uhhuh. :) You already know the drill.
--
Sampo Syreeni, aka decoy - [email protected], http://decoy.iki.fi/front
+358-50-5756111, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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