Hi Guys
Would like to hear from you experts on why's of this speaker. Though I don't know much about speakers, I do think that there's really some clever engineering & thoughts that went into this design by the old gurus.
1. Speaker cone : It's paper but coated with if memory serves me correct a glue made from corn starch, what is special is the surface feels rough to touch. I believe the glue was mixed with some granular medium. Question : Why so, is it to add strength like cement & sand or was other factors involved. I must say the cone is really stiff & I guess heavy too hence the huge magnet used I think.
2. Cloth surround: Think it is dope cotton or silk but for me never seen it use this way, mostly are pleated with heavy doping & stiff
3. Rubber Ring : This is also interesting, there's a groove on the basket where this ring is push fitted in. This is not a gasket as the expose part is half round like the surround. Question: Is it to help damped the basket & does the convex surface helps with diffraction etc ?
4. U shape thingy: This is located in between the 4 basket support, think this is a damper of sorts.
These are just my own speculations, would like to from from you experts what your thoughts are.
Thanks
Would like to hear from you experts on why's of this speaker. Though I don't know much about speakers, I do think that there's really some clever engineering & thoughts that went into this design by the old gurus.
1. Speaker cone : It's paper but coated with if memory serves me correct a glue made from corn starch, what is special is the surface feels rough to touch. I believe the glue was mixed with some granular medium. Question : Why so, is it to add strength like cement & sand or was other factors involved. I must say the cone is really stiff & I guess heavy too hence the huge magnet used I think.
2. Cloth surround: Think it is dope cotton or silk but for me never seen it use this way, mostly are pleated with heavy doping & stiff
3. Rubber Ring : This is also interesting, there's a groove on the basket where this ring is push fitted in. This is not a gasket as the expose part is half round like the surround. Question: Is it to help damped the basket & does the convex surface helps with diffraction etc ?
4. U shape thingy: This is located in between the 4 basket support, think this is a damper of sorts.
These are just my own speculations, would like to from from you experts what your thoughts are.
Thanks
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My bet is that the U-shaped things on the back of the cone help to absorb/redistribute bell-mode resonances.
The black ring might just be for air sealing if you mount the driver from inside the cabinet.
My biggest concern for that driver, just looking at it, would be the metal dustcap. There's a reasonable chance it'll ring like crazy, resulting in some mess >6kHz.
Chris
The black ring might just be for air sealing if you mount the driver from inside the cabinet.
My biggest concern for that driver, just looking at it, would be the metal dustcap. There's a reasonable chance it'll ring like crazy, resulting in some mess >6kHz.
Chris
Thanks Chris for your thoughts. Have test the speakers on an OB once, it sound very even & good with no nastiness & this was tested against my ML Odyssey speakers. As for the black ring Im not so sure cause if was for sealing, they need not have to place the effort into making a groove to sit it & why would it need to be convex & not flat. Who knows you might be right. Lol
Is the dustcap the same size as the coil? If so it's acting like a tweeter and hopefully has some damping on the back side.
The black ring likely secures the surround like the paper ring does on a steel basket.
The black ring likely secures the surround like the paper ring does on a steel basket.
Yes Cal dust cap is VC size. It actually is spec as a FR speaker. For me again I find the details in the design very intriguing. Just too bad no detail info are available. What really did surprised me was that it has very good transparency & very smooth overall sound much much better than the Coral Flat 8 that I have & also good bass as I could clearly hear the double bass on Ray Brown Trio cd in an OB test set up.
Thanks
Thanks
Yes sumotan, we know it's a FR. The metal dust cap attached to the end of the coil rather than the cone makes it act more like a tweeter. There are other examples of that over the years. I'm not sure why the whizzer cone won out over the coil cap.