no moving coil no fixed magnet and no cone

[simeon w]

hi all

attached is a new type of speaker design

walk around so can hang or go on a stand

stereo
and no moving coil no magnet and no cone



can be further split for quadro etc
and very high powered
needs a tweak or two to the design
but the basics is there

the iron rings are bonded to the hemespherical wood sound emitter

[bentoronto]

Always good to see new concepts. The Rice-Kellogg cone driver is as close to over-bloated obsolescence as the internal combustion engine in cars.

Is it a Magnepan with mag-lev suspension?*

Looks like there is a soft "surround" to support the diaphragm when the suspension power is off and to address front-to-back out of phase cancellation.

Ben
*I worked on mag-lev trains in the early 70's.

[ashok]

By function a cone is a large area that moves air in a speaker. This one has a hemispheric radiator and so is an equivalent 'cone'. There are several coils. One shown behind the apex of the hemisphere appears to drive it and isn't that a 'moving coil' ? So the description appears to be misleading ?

A speaker that really fits most of the description would be a plasma speaker ( usually tweeter!).

[WrineX]

wow thats the first time i really have no clue how it works and what i am looking at haha

[simeon w]

hi

there is no moving coils

the reflex dampen system isnt adjusted other than at power on
the DC levitation can be modulated
the hemespheres can be textured and the higher frequencies split off to drive the hemespere centers drive coil set

the drive coils are mounted on disks
the center of the hemesperes is a dual coil
right and left

there is no cone infact the exact opposite
the drive system can be set up to accept line input
and just one fet per coil on each ring

the fixed point is enough to hold the hemespheres fully
and the speaker will perform quite well
but with active setup
then it will sound much louder and clearer im sure

as i say it will need tweaks and design thinking

but i cant see anything like this anywhere anything similar
and the SST split sphere tech has other uses
forinstance it can be used as a very sensitive directional mic
or as a transducer if made smaller or perhaps made of quartz

self contained for cleaning pipes

[TNT]

Fun thing. Did you do a prototype yet?

//

[simeon w]

no just at the drawing stage and iron out problems before having to make another one
saves a bit of time

ive done some spacial simulations seems to give a good projection of sound
the texture of rings i think

the problem i have is model software is rubbish at this kind of thing
speaker design software all runs around cones and woden boxes
if anyone has an idea of a good simulation tool
as for the electronics this part is easy and very easy to build
the iron ring can be replaced with iron slugs per coil step coupling core
so this will reduce the weight and aid in resosnace..
i see this place and im thinking this is a good place to fire it at..

[Sonce]

simeon w, I still can't understand how it works (and I have impression that I am not the only one). Maybe some better picture will help?

[ashok]

I don't understand how sound is produced without any moving part. Sound requires air as a medium , for the ear to hear. Something needs to move that. If there is vibration of the hemisphere then that is the moving medium, an equivalent cone ! In a plasma speaker even that does not exist but it works in a different way altogether.
If the coils do not move what do they do ? Generate a magnetic field which does what ?
Can't figure out how this works !

[WrineX]

me neither i love new ideas but i cant wrap my head around it this time haha