Opposing voice coils?

JCoffey · 6th November 2008, 01:41 AM

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?

craigwalsh · 6th November 2008, 04:03 AM

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).

Luke352 · 6th November 2008, 02:54 PM

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

6th November 2008, 01:41 AM	#1
JCoffey diyAudio Member Join Date: May 2003 Location: Atlanta, GA	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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6th November 2008, 04:03 AM	#2
craigwalsh diyAudio Member Join Date: Dec 2007	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).

6th November 2008, 02:54 PM	#3
Luke352 diyAudio Member Join Date: Jul 2006	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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