After long brainstorming sessions, i debate the real actual fonction of the ''wizzer cones''.
Is that cone an actual tweeter cone? OR a horn, to the ''dome tweeter'' dust cover?.
I think the latter makes more sense!...
Food for thoughtsss!
Is that cone an actual tweeter cone? OR a horn, to the ''dome tweeter'' dust cover?.
I think the latter makes more sense!...
Food for thoughtsss!
No, it is literally a tweeter cone.
Of course, angle must be steeper than main cone one so it´s physically separate from it, simple Geometry.
Since main cone is flexible, voice coil actually moves faster than it, so a second very low mass cone directly attached to voice coil can reproduce some highs that the main one can not.
Nothing more complex than that.
Of course, angle must be steeper than main cone one so it´s physically separate from it, simple Geometry.
Since main cone is flexible, voice coil actually moves faster than it, so a second very low mass cone directly attached to voice coil can reproduce some highs that the main one can not.
Nothing more complex than that.
JM has it nailed. If one can get away without them, no whizzer is better, but it is much harder to design a drivber with the same FR extension without one.
One can also make generalizations about whizzer shape.
dave
One can also make generalizations about whizzer shape.
dave
I've never much liked the idea of whizzer cones, seem like an afterthought and the unsupported outer edge I imagine flapping around in the breeze.....
This is where shape (a curved whizzer or one with a flat edge) plays a role and one of the reasons the 98 cent whizzer trick works.
dave
you are right scott.
a whizzer is like getting hit in the knee (energy into cone's coil) then the foot comes up (whizzer vibrates after the fact).
It resonantes late (in time), and has all sorts of resonances of its own, but it adds high end where it was not before, it lowers climbing output of a driver and spreads dispersion of the cone woofer's top range, which is basically the same thing now that I think about it.....................
but, yea, since my array of w4-1337sdf, I'm not a huge whizzer fan.
a whizzer is like getting hit in the knee (energy into cone's coil) then the foot comes up (whizzer vibrates after the fact).
It resonantes late (in time), and has all sorts of resonances of its own, but it adds high end where it was not before, it lowers climbing output of a driver and spreads dispersion of the cone woofer's top range, which is basically the same thing now that I think about it.....................
but, yea, since my array of w4-1337sdf, I'm not a huge whizzer fan.
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Like the enabled phase plug!An edge as in the newest Lowthers or as seen on the current Fostex FExx6.
dave
If you are worried about the whizzer cone flapping about, you could try this:
Has anyone else tried criss crossing cotton thread across a whizzer to stop the bell mode resonance?
I stretched cotton thread aver a soup bowl in a very open weave to give hexagon shape 1cm holes (it was a big whizzer), painted it with PVA and let it dry. I then put a bead of PVA round the top edge of the whizzer and stuck it on. Stopped the bell mode completely on mine. Reversible too at a push. I have a photo somewhere and will try to find it.
from here: http://www.diyaudio.com/forums/full-range/185012-whizzer-intelligibility-5.html#post5003456
I also made these coaxial using a dome tweeter, but that is another story...
Brian
Has anyone else tried criss crossing cotton thread across a whizzer to stop the bell mode resonance?
I stretched cotton thread aver a soup bowl in a very open weave to give hexagon shape 1cm holes (it was a big whizzer), painted it with PVA and let it dry. I then put a bead of PVA round the top edge of the whizzer and stuck it on. Stopped the bell mode completely on mine. Reversible too at a push. I have a photo somewhere and will try to find it.
from here: http://www.diyaudio.com/forums/full-range/185012-whizzer-intelligibility-5.html#post5003456
I also made these coaxial using a dome tweeter, but that is another story...
Brian
Hi there Brian: Re😛ost #12, Restrain the wizzer with threads is a neat solution. I'll bet that the glue around the wizzer rim is adding to the effect. Maybe gluing the strings* with "glue dots" would further enhance the effect? *(restrain the wizzer directly, then glue the strings with applied dots, "enhanced enable process"...? ...regards, Michael
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I never thought of the whizzer as a tweeter, since it has no voice coil of magnet of its own. Except that I can see the logic in this:
I just see them as a smaller cone with a wider directivity at high frequencies. They take what would normally beam and spread it around.
Everyone that heard a good Lowther know that wizzer ain't bad. The wizzer is mostly a bending wave transducer I believe.
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I've heard wizzers that sound good, and wizzers that ruined the whole thing, like with everything else it depends on the application/design/materials etc.
Here comes generalizations and personal opinion:
Biggest driver I have heard that does really good with no wizzer is the Tang Band W5-1611, so not that big. The ones smaller than this that had wizzers did not sound good to me, so my personal preference would be anything less than 5" to be without wizzer. 6-8" needs help from a tweet or the wizzer must be very carefully designed, 10" and up can work very well with wizzers.
Here comes generalizations and personal opinion:
Biggest driver I have heard that does really good with no wizzer is the Tang Band W5-1611, so not that big. The ones smaller than this that had wizzers did not sound good to me, so my personal preference would be anything less than 5" to be without wizzer. 6-8" needs help from a tweet or the wizzer must be very carefully designed, 10" and up can work very well with wizzers.
it's not generalization nor personal opinion: the bigger the cone, the heavier, so no magic behind the explanation.
Make 1 g cone ( probably a silk dome...) move fast, say, 10000 times in a second.
make 10 g cone move at the same velocity with the same frequency.
Take a 100 g woofer ....
Make 1 g cone ( probably a silk dome...) move fast, say, 10000 times in a second.
make 10 g cone move at the same velocity with the same frequency.
Take a 100 g woofer ....
So you talk about pistonic movement (meaning that the cone does exactly what the coil does)? Yes - it will be hard to move the outer rim of a 90 gram 15 inch cone 18000 times back and forth per second. It just wont happen. But the coil tip might do some movements at this frequency and this is what the wizzer pics up on of course. Now, even moving a 5 gram wizzer isn't possible in a pistonic way at 18k - heck many domes even don't do it; check the breakups - thats where the pistonic behaviour ends and bending wave mode starts. At higher frequencies than the brerak-up, the coil and the cone are decoupled. The cone becomes like jelly. The coil send waves into the jelly and the wave flows through the jelly - this is bending mode. This is how Manger and Göbeln driver operate on a large portions of their usable range.
The wizzer is jelly! 🙂 pic your flavour.
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I usually prefer pudding over jelly, prefferably home made almond or caramel pudding with equally home made raspberry sauce with or without seeds, maybe sprinkled with a few redcurrants.
What is the pudding equivalent in wizzer theory? Does pudding have lower breakup than jelly?
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It's all jelly/pudding! 🙂
Everything is flopping about in the hopes of generating something resembling flat frequency response in the desired band.
What is the pudding equivalent in wizzer theory? Does pudding have lower breakup than jelly?
Edit:
It's all jelly/pudding! 🙂
Everything is flopping about in the hopes of generating something resembling flat frequency response in the desired band.
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