Posted by Wayne Parham [ 66.137.59.19 ] on April 02, 2004 at 13:38:35:

In Reply to: Aluminum foil used as a transducer posted by tailgunner on March 14, 2004 at 12:46:19:

That looked like a cool thread to me. One thing that puzzled me was how to use a homogenous conductor for a membrane.

I would have guessed that an electromagnetic planar speaker would be made with a non-conductive membrane having a conductive foil etched onto it that acted like a voice coil. This would be surounded on both sides with a perforated magnetic panel. Seems like an electrostatic planar would have a non-conductive membrane surrounded on both sides with perforated plates that are charged to high voltage.

So I guess I'm missing something, because I'm not seeing how a homogenous conductor can be used for a membrane. I never thought it through, but on first glance, it seems like you'd need something more like wax paper or plastic wrap.

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