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Old 24th October 2009, 07:57 PM   #11
freddi is offline freddi  United States
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hey kenpeter - re:styrofoam - over at High Efficiency Speaker Asylum I posted another "The Audio League Report" - this time from Nov. 1954 with text blurbs on the HiFi Fair of that year -(Karlson 12 made its debut at that show) here's the page with the "De Mars Styrocone Speaker" http://img245.imageshack.us/img245/3783/af1954pg2w.gif
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Old 28th October 2009, 07:14 PM   #12
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Can't comment on the horn but the driver sure looks familiar.
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Old 28th October 2009, 07:54 PM   #13
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hey

that looks fookin nice !

pretty clever approach , in any case
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Old 29th October 2009, 08:28 PM   #14
Helmuth is offline Helmuth  Netherlands
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Smart to make a horn from that soft material(damping).
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Old 29th October 2009, 08:32 PM   #15
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I'm now thinking Unity here as well...

An if that news weren't strange enough. I'm also thinking what-if
you fold a Smith horn???? Folded on a parabolic curve... Can it be
tricked to exit from a flat front slot in one phase, as-if a line array?
Does the non-expanding part (after the parabolic) serve as a plane
wave tube?

And if that still ain't strange enough. Also thinkin Smith Unity to
replace the driver in a Karlson type enclosure. That would mean
loading the backs of the cones to the K box. Not sure how thats
gonna mess with EBP??? As most advice I've heard is to seal the
backs of such cones in attempt to raise both Fs and EBP.

I don't think Styrofoam will be the material of choice, but might
still get abused here and there...

Last edited by kenpeter; 29th October 2009 at 08:56 PM.
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Old 30th October 2009, 12:24 AM   #16
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I've had a beast of a time figuring how to draft Parabolas in Sketchup.
Think I finally understand at least two ways to draw this conic section.
Now I gots to go cipher on how to make sure the focusation is right....
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Old 30th October 2009, 01:28 AM   #17
gedlee is offline gedlee  United States
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Quote:
Originally Posted by kenpeter View Post
Just screwing around with polystyrene... Seems to work!
I'm not a big fan of that kind of horn, but I love the idea of the material and the implimentation. That's really using your head to do things in a very practicle way. More audiophiles should think like this and look at doing things simply, not outrageously complex.
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Old 30th October 2009, 08:00 PM   #18
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Mr Geddes, how thin would a slot opening need to be to
have reasonably even diffraction over the full audio??

Even if diffraction evenly disperses, I do feel concern
of reflected power from the discontinuity echoing back
down the throat and causing abnormalities.

You saw the scalloped clamshell version I drew?? Does
it seem at all plausible that such Karlson/PlateLens
terminations could mitigate reflected discontinuity's
effects? Blurring discontinuty's distance seen from
the throat...

Is there any "right" way to do diffraction? Or have you
written it off as an evil totally not worth exploring?
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Old 30th October 2009, 10:18 PM   #19
gedlee is offline gedlee  United States
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Quote:
Originally Posted by kenpeter View Post
Mr Geddes, how thin would a slot opening need to be to
have reasonably even diffraction over the full audio??
There is no answer to this question.Its not the "slot" that diffracts, its the edges.

Quote:
Originally Posted by kenpeter View Post
Even if diffraction evenly disperses, I do feel concern
of reflected power from the discontinuity echoing back
down the throat and causing abnormalities.
Thats one of the major problems.

Quote:
Originally Posted by kenpeter View Post
You saw the scalloped clamshell version I drew?? Does
it seem at all plausible that such Karlson/PlateLens
terminations could mitigate reflected discontinuity's
effects? Blurring discontinuty's distance seen from
the throat...

Is there any "right" way to do diffraction? Or have you
written it off as an evil totally not worth exploring?
Not much is going to help with a mouth shaped like that.

There is no such thing as "good" diffraction. It's all bad in a playback system and so I never considered exploring what you suggest since its obvious that there isn't a "right" way to do the "wrong" thing.
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Old 30th October 2009, 10:58 PM   #20
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Edges huh??? So maybe really sharp edges? No flats on the lips?
A baffle step so short that literally every audio frequency folds
back equally (the full amount). I was thinking only the width of
the slot, but the lip faces and outer edges too are crucial to the
overall diffraction.

I'm not entirely convinced yet maybe there isn't a "right" way.
By promoting diffraction to do its thing and not fight against it...

But if its not rewarding hoped for results, I won't kill too much
time on it. Your experience and advice is noted and appreciated,
even as I charge ahead in obviously the "wrong" direction a short
while longer. I may yet come to agree with you, but not before
running an experiment or two...

Last edited by kenpeter; 30th October 2009 at 11:05 PM.
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