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Magnetless Subwoofers


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coppellstereo 
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Posted: June 18, 2006 at 12:00 PM / IP Logged  

How does a magnetless speaker/subwoofer work?

Thanks!

DYohn 
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Posted: June 18, 2006 at 12:02 PM / IP Logged  
coppellstereo wrote:
How does a magnetless speaker/subwoofer work?

Thanks!

There is no such thing.  Loudspeakers require magnets to function.  Where did you see a "magnetless" woofer?

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Steven Kephart 
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Posted: June 18, 2006 at 12:15 PM / IP Logged  

I suppose if you make the pannel large enough, you could make a subwoofer out of an electrostatic speaker.  Here's a link describing how they work: http://electronics.howstuffworks.com/question713.htm

The only other one I can think of is the prototype  Ionic speaker Adire Audio showed at CES this year.  But as it's a prototype of a developing, unreleased technology, you won't get a description how it works.

church_of_bass 
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Posted: June 18, 2006 at 4:36 PM / IP Logged  
the phoenix gold cyclone is a coneless woofer.  It does have a magnet, but it is not a conventional speaker.  It converts low frequency to kinetic energy with a rotary motion, moving air inside the structure of the speaker, rather than a linear motion moving air in front of and behind the speaker.  Never seen one in action, but it is a real cool idea.  As for magnetless, i don't know that they exist.
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haemphyst 
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Posted: June 18, 2006 at 6:09 PM / IP Logged  
DYohn wrote:
coppellstereo wrote:
How does a magnetless speaker/subwoofer work?

Thanks!

There is no such thing.  Loudspeakers require magnets to function.  Where did you see a "magnetless" woofer?

No, Dave, they require magnetic FIELD to work. IF you were to wire a stator field OUT of phase to a voice coil field, it COULD work, but I doubt the efficiency would be worthy of the effort... Also, the waste of 50 percent of your amplifier power in the stator field would make many people think twice about it...
You are most likely correct, for now. They do not exist - commercially. But if *I* was able to devise one on paper (no proof-of-concept ever built) surely somebody out there with MUCH more money and brains than I have has certainly built such an animal...
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
DYohn 
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Posted: June 18, 2006 at 6:22 PM / IP Logged  

Not to pick nits Dave, but an electromagnet is indeed still a magnet, it just may not be a permanent one.  And Steven, I believe the plasma field speaker systems I have read about use magnetic deflection coils to focus the energy (not sure if the Adire experimental system do or not, though.)  Magnetless Subwoofers -- posted image.

Coppellstereo, are you talking about some of the newer shallow-mount woofers that appear to be nearly flat?  These use an inverted motor system and the magnet assembly is located inside the "cone" area - so to speak.

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coppellstereo 
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Posted: June 18, 2006 at 8:30 PM / IP Logged  
Actually yes - I was looking at a shallow mount subwoofer - the guy I was talking to called it 'magnetless', but upon further investigation I found the truth!  Thanks again
Steven Kephart 
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Posted: June 18, 2006 at 8:44 PM / IP Logged  
DYohn wrote:

And Steven, I believe the plasma field speaker systems I have read about use magnetic deflection coils to focus the energy (not sure if the Adire experimental system do or not, though.)  Magnetless Subwoofers -- posted image.

No magnets at all.  It consists of one screen having a negative charge and the other having an AC signal voltage applied to it.

Steven Kephart 
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Posted: June 18, 2006 at 10:07 PM / IP Logged  

church_of_bass wrote:
the phoenix gold cyclone is a coneless woofer.  It does have a magnet, but it is not a conventional speaker.  It converts low frequency to kinetic energy with a rotary motion, moving air inside the structure of the speaker, rather than a linear motion moving air in front of and behind the speaker.  Never seen one in action, but it is a real cool idea.  As for magnetless, i don't know that they exist.

Phoenix Gold actually liscensed that technology from Servodrive.  It was a unique take however as the Servodrive units were belt driven models.  It does use magnets in the motor though.

DYohn 
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Posted: June 18, 2006 at 10:27 PM / IP Logged  

Steven Kephart wrote:
No magnets at all.  It consists of one screen having a negative charge and the other having an AC signal voltage applied to it.

Ah, so it's based on an ion pump to move the air.  Interesting.  I'll have to go see it one of these days!

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