[microsound] Transducers as speakers

[michael trommer]

Thanks everyone...!


On 12-01-01 7:55 PM, "John Hopkins" <jhopkins at tech-no-mad.net> wrote:

> 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
> 
> 
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> John Hopkins
> Watching the Dhao rather than watching the Dow!
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