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Multi-Way Conventional loudspeakers with crossovers

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Old 14th April 2003, 12:03 AM   #11
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Quote:
Originally posted by Nappylady
Okay, I'm interested in hearing about these things with paper cones... are you talking about coating them, etc? I have some paper cone 15's
Yep... it is common in full-ranges & extended range woofers to have a controlled decoupling of more and more of the outer part of the cone as the frequency increases.

To do this with something like puzzlecoat you create a set of ever-more heavily coated annular rings on the cone (ie thickest ring at the centre). To do this you define the rings. Then coat 1 only goes on the inner ring, a 2nd cost also covers the 2nd ring, so on until the entire cone has at least one coat.

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Old 14th April 2003, 12:52 AM   #12
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The cone is made of paper, surround is made of foam, and the dustcap is like some hard cloth.

Theyre out of some old radioshack speakers, i think i heard somewhere coral used to make alot of the drivers for radioshack speakers. Coral is vifa/scanspeak now right ?

I think id like to go with just using a cap for this project to just get me started. How would i go about choosing the right cap for the drivers ?

Also im interested about how you said to improve the paper speakers dispersion.
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Old 14th April 2003, 02:00 AM   #13
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The cap is chosen by value according to what crossover frequency you desire.

Measure the frequency response of the drivers. Only this will tell you where the best place to crossover is.

Even measuring by ear isn't so bad, with a trained ear, but microphones are cheap (you can get a mic element from Radio Shack for <$5) and give better-looking graphs.

I don't know the equation for which value capacitor you want, but I know that as the frequency you want increases, the capacitance must decrease.

Maybe what you could do is get the assorted caps from Radio Shack and play with different values to see what sound you like best.

Let us know, in any case, what you do, and if you get frequency reponse graphs, post 'em--I'm curious now. :-)
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Old 14th April 2003, 07:29 AM   #14
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Quote:
Originally posted by postman
i heard somewhere coral used to make alot of the drivers for radioshack speakers. Coral is vifa/scanspeak now right ?
Radio Shack was indescrimenent -- they bought from whoever was cheapest -- Coral, Foster, Panasonic.

Have you got any more info on where Coral went? All i know is that they used to be a large Japanese manufacturer and then they packed up.

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Old 14th April 2003, 01:15 PM   #15
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I think I read somewhere that Coral is Peerless now
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Old 14th April 2003, 02:45 PM   #16
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yeh thats what i said before peerless/vifa/scanspeak

Planet10 would i have to do any measure ments before trying to coat the speaker with puzzlecoat ?
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Old 14th April 2003, 05:30 PM   #17
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I think I read somewhere that Coral is Peerless now
If it is true, it is unfortunate that they did not continue with some of Corals best designs...

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Old 14th April 2003, 05:43 PM   #18
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Planet10 would i have to do any measure ments before trying to coat the speaker with puzzlecoat ?
No measures needed, the process is completly impirical. A rigourous experiment could probably analytically measure the results, but would require a quantity of the same driver and a series of treatments backed up by listening.

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Old 15th April 2003, 01:11 PM   #19
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What other names are there for puzzlecoat ?? Cause i couldnt find any anywhere. Also is there a special technique of applying it ?
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Old 15th April 2003, 05:24 PM   #20
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What other names are there for puzzlecoat ??
Puzzlecoat is actually a name from a 25 year old product, that like kleenex or Xerox, has become generic in my mind. Follow the link for modern sources. In a pinch, white wood glue will also work.

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