[microsound] Transducers as speakers

[John Hopkins]

hei!

> I was wondering if anyone has had any experience using transducer-type
> speakers.

Variables which affect the frequency spectrum of resonance would include:

acoustic coupling (how solidly the speakers are 'stuck' to the object (silicone 
bathroom adhesive versus merely sitting on the surface (gravity) versus thin 
polymer glues)

size and shape of the object (large, symmetric, asymmetric, etc)

rigidity/flexibility of the object (rubber vs metal)

thickness, porosity, internal consistency (air bubbles, solid, dense...)

how/where object is fastened to wall, ground, other points (widow glass around 
edges, plexiglas clamped to wire hangers, metal plates sitting on several sharp 
points, etc).

There are linear system formulas which can be deployed for homogenous materials 
with known physical parameters... these can indicate the frequency response in 
simple configurations...

It can be helpful to stick the speakers on and use a frequency oscillator to 
scan the frequencies and see what resonant amplitudes are happening -- these can 
work to amplify narrow frequency bands by several db. (and thus 'distort' a flat 
spectrum input...  Beware!)

It's a game...

jh


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John Hopkins
Watching the Dhao rather than watching the Dow!
http://neoscenes.net/
http://tech-no-mad.net/blog/
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