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Old 6th November 2008, 01:41 AM   #1
JCoffey is offline JCoffey  United States
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Join Date: May 2003
Location: Atlanta, GA
Default Opposing voice coils?

OK, this is me bored and day dreaming. But, has there ever been a sub driver with multiple voice coils? I dont mean a DVC motor, but a driver with multple motors, lite 3 or 4 one on each edge to control movement, or a driver with a motor and voie coil on either side of the cone to control distortion and movement to lower distortion?
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Old 6th November 2008, 04:03 AM   #2
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I believe that Philips has a patent on a multiple voice coil speaker. It was designed to serve as a physical embodiment of a DAC. That's right, a digital direct drive loudspeaker! However, I would imagine that for them, getting the voice coils to overlap as closely as possible was a design goal (e.g. to minimize non-linearities in the drive system).
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Old 6th November 2008, 02:54 PM   #3
Luke352 is offline Luke352  Australia
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Join Date: Jul 2006
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Do you mean something like this http://www.diymobileaudio.com/forum/...ad.php?t=48223

Works very well, lowers distortion, lowers inductance, and due to it's nature helps prevent overhang/overextension due to the electromagnetic braking force that comes as a result of the design.

Patent was done in 97-98 http://www.patentstorm.us/patents/57...scription.html

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