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Weird Planot speaker... no cone, no membrane...anyone know this thing?

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Very odd that they would want to sell the plans, but don't build themselves. Prototypes to show that it actually works are kinda helpful...................
 
Judging from their patent drawing, it looks like it spins- not good. the motor structure looks like it would carry significant mass and would require lots of high DF power to control. It's nobel in that it seems to attempt to emulate the vibration of a string, but a normal planar speaker (ala Magneplanar or Martin Logan) would do a better job I would imagine.
 
They say there's no back-wave to cancel out the front-wave but i suspect that in actuality there's no bass to be canceled out anyway.
 
Being a fan of similar designs, if I had the time and such, I'd give it a whirl:D

What designs are similar? I can't think of a single other made like that, unless you mean similar in the way a ribbon driver is also narrow and linear.

I've often thought about ways to come up with something approaching a true line in space --or even better, a point-- that moves/changes in such a way as to create sound waves in the air, but it is a daunting challenge to make one work in real life. I have a few ideas, but none of them are remotely practical to actually create. That's why this intrigues me. They MIGHT have come up with a reasonable --and possibly better, albeit still not ideal-- way of getting decent sound from something approaching a line. ...although I cannot imagine it being nearly as fast as a ribbon, given the mass (and consequent inertia) of the thing that they are moving!

Perhaps what driver designers should be concentrating on is a way to effectively and economically enlarge a HEIL AMT driver and thus extend its range all the way down to sub-woofer level. Do that, even if it takes two drivers to cover the entire frequency range, and I think you'll have the best speaker that will ever be built, short of "molecular" designs. By "molecular", I mean things like molecular crystal lattices that expand and contract themselves instantly as electrons (electricity) is passed through them. Those would be the "ultimate" speaker systems. The only existing technology that I know of that even remotely approaches making sound at that level is a plasma driver. Perhaps one day materials chemists will find or create something that will work.

I actually walk around sometimes with pictures of these things in my head, little but complex spherical lattices that pulsate in and out, smaller and larger... I can see how they work, just like those plastic toy ball things made from hinged rods that you can pull apart and push together. I can imagine electromagnetic charges in such a lattice serving to "push" and "pull" elements of it together/apart, but I can't come up with the elements and chemical bonds with states that would replicate the "hinges and work properly. Unfortunately (or perhaps fortunately!), molecular bonds do not behave like simple hinges!

On a much larger scale, I can make this work with electromagnetic drivers similar to voice coils, etc... but on that scale, the sound doesn't work right, and the complications and compromises of trying to make it work properly and to emulate a point source, along with some inherent drawbacks to the mechanics involved, make it a non-starter.

So the Planot thing intrigues...
 
Only thing I can think of that's remotely similar is this.
Ok, now I'm really flummoxed. This rotary woofer has really piqued my interest, more so than the subject of this thread. I'd love to hear what it sounds like.

Anyone remember the glass plate tweeter reviewed some years ago in several hi-fi publications?
 
Interesting design.... How come the right and left edge of the drivers do not cancel each other pressure wave out...? Seeing one would move towards you and the other is moving away....

Still seems Mr. L. Walsh was many years a head of his time...even with his spiders and surrounds....

I did not see any mention of efficiency.....

I have access to a mill and lathe.... it would be a very cool project....

jk
 
I actually walk around sometimes with pictures of these things in my head, little but complex spherical lattices that pulsate in and out, smaller and larger... I can see how they work, just like those plastic toy ball things made from hinged rods that you can pull apart and push together. I can imagine electromagnetic charges in such a lattice serving to "push" and "pull" elements of it together/apart

i swear that i was just thinking about this exact kind of thing yesterday when i was pondering my new quantum line source's! then, in trying to fix the technical shortcomings, i came to the logical conclusion that we should just listen to all music live :sigh:

in all seriousness, the lattice idea might work if you could exert electromagnetic forces from every direction outside the lattice, imagining something like a sphere of charges concentric to the lattice, but this concentric sphere would still somehow have to be sonically transparent, and i just don't see that working, even if we could manipulate the charges properly. i don't know...
 
Sorry Arkay, just stuwee, tryin' a funny:D

"Being a FAN of similar designs, if I had the time and such, I'd give it a WHIRL"

Get it?:D, okay, I went a little Out there, I thought I was brilliant:D
 
i swear that i was just thinking about this exact kind of thing yesterday when i was pondering my new quantum line source's! then, in trying to fix the technical shortcomings, i came to the logical conclusion that we should just listen to all music live :sigh:

in all seriousness, the lattice idea might work if you could exert electromagnetic forces from every direction outside the lattice, imagining something like a sphere of charges concentric to the lattice, but this concentric sphere would still somehow have to be sonically transparent, and i just don't see that working, even if we could manipulate the charges properly. i don't know...

I don't know, either, but now you are getting into some of the problems I was referring to. I've dabbled with thinking about this stuff literally for YEARS, and while I've occasionally had some insights or ideas, I've yet to come up with anything remotely achievable in the real world, using any materials or technologies that I know actually exist. There are all kinds of challenges and difficulties in trying to make a "quantum breakthrough" in driver design. {And I'm not going to begin to get into the mental masturbation of designing speakers based on quantum mechanics. Save that for science-fiction fantasies. LOL!}

These difficulties probably constitute the main reason that except for some minor tweaks and newer materials, most drivers today look remarkably like the ones our grandparents had, and many of us still eagerly seek out grandpa's old speakers! Speaker execution has advanced a bit (mostly to suit the needs of manufacturers!), but the basic designs have been "stuck" a lot longer than many technologies. The few really innovative designs mostly remain on the fringes, like plasma speakers with their big problem of running costs and ozone production, and the Heil AMT, which IMO has not found the widespread application it deserves. Planar and ribbon drivers are gradually getting wider use, but even all these things are decades-old technologies. I do think that one day some materials chemist will stumble on some new metallic polymer compound (or whatever) that will behave in a way that will make some of these more extreme "molecular-based" ideas possible. In a way, Piezo tweeters are almost a "molecular" design, but unfortunately they are crude and not good-sounding, and trying to re-fashion them into something more practical presents its own set of seemingly insurmountable obstacles (although I haven't given up on thinking along those lines yet).

Then again, even if a breakthrough made it cheap and easy to make something like this, if the speaker were THAT good and THAT revealing, it would mean people could clearly hear how poor their iPod MP3s really sound, and how badly mastered half their CDs are. Might remain a niche market, and might not be economical for mass-production... or it might revolutionize audio and create a resurgence of demand for good-sounding recordings. Who really knows what the audio world will look and sound like, 50 or 100 or 200 years from now?

Sorry Arkay, just stuwee, tryin' a funny:D

"Being a FAN of similar designs, if I had the time and such, I'd give it a WHIRL"

Get it?:D, okay, I went a little Out there, I thought I was brilliant:D

AAAAH, if you are referring to the weird fan sub-woofer, it makes great sense, and was brilliantly "punny" (a pun on "funny"! :D). Well done! :thmbsp: I didn't get it at first because the Planot design I was referring to in the OP is a completely different design, not using a fan.... although it does whirl! :yes:
 
You, Sir, are the best, anyone who can buy 140 drivers and even think of starting a project of epic proportions and, still have time to mess with our heads with that speaker design in the OP:thmbsp::thmbsp:

Craig:music::music:
 
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