hey X - can akabak tell how the following coupler shape performs? - this is the "Dutch" K12 type with 3 rather large distributed slot vents - I think it would still tune around the same area as JEK's K12 There's no upper reflector board. There's two rear shelf boards like those of Karlson's July 1958 Popular Mechanics article.
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Freddi,
From the drawing, I can't tell what the dimensions of the rear shelves are. It looks like the rear shelf port connecting the top and bottom rear chambers is blocked by a solid board.
X
From the drawing, I can't tell what the dimensions of the rear shelves are. It looks like the rear shelf port connecting the top and bottom rear chambers is blocked by a solid board.
X
its made in the rear just like the 1956 K12 which appeared as a construction article in 1958 - - each shelf board is 100mm wide and 150mm deep Here's the Dutch K12 article https://docs.google.com/file/d/0B1shOod … MzbEk/edit
btw- here's a K-variant for fullrange - direct radiator front, K-rear load - they stand upright
btw- here's a K-variant for fullrange - direct radiator front, K-rear load - they stand upright
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other than a small choked chamber which feeds through a a 12cm high gap, its straight
Its not far off from this 1982 patent
- I'd almost like to play with this using a fullrange on the front face - this is one of several patents which give no credit/reference to Karlson. btw - Karlson's original partner and vice president til ~1956, Wayne Green, passed away Sept. 13th this year at age 92. Wayne published magazines including BYTE and Digital Audio Review.
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Its not far off from this 1982 patent
- I'd almost like to play with this using a fullrange on the front face - this is one of several patents which give no credit/reference to Karlson. btw - Karlson's original partner and vice president til ~1956, Wayne Green, passed away Sept. 13th this year at age 92. Wayne published magazines including BYTE and Digital Audio Review.
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- that Dutch K12 was probably the inspiration for this
at auction, about 10 years ago there was an acrylic mini Karlson which was thought to be a salesman's sample - wish I
had landed it.
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at auction, about 10 years ago there was an acrylic mini Karlson which was thought to be a salesman's sample - wish I
had landed it.
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Freddi,
Just looking at the shape of the Dutch k12 I don't think it will be remarkably different than a standard k12 as the dominant factor in the sound is the volume of the chambers, the shelf csa, the vent, and the K coupler aperture. The shape of the front chamber will not be a big change, the distributed slot vents have more impact and I have modeled that effect before somewhere in either the Karlson thread or the Kicks Butt thread.
X
Just looking at the shape of the Dutch k12 I don't think it will be remarkably different than a standard k12 as the dominant factor in the sound is the volume of the chambers, the shelf csa, the vent, and the K coupler aperture. The shape of the front chamber will not be a big change, the distributed slot vents have more impact and I have modeled that effect before somewhere in either the Karlson thread or the Kicks Butt thread.
X
re: venting, what are the causes of dips in the X15? - is if from too small a vent? - could the
cupped nature of its front cavity exacerbate things?
Beyma 12cx – outdoors – ground plane
X15 loaded with a familiar set of Beta 12cx indoors in a small room vs two K12s - I did not offset any trace
so you can see Beta12cx was somewhat lower in output - subjectively it played a big odaiko at startling dynamics
without a lot of cone movement.
look at the similar sized Acoustic Control 115BK – even with its vent blocked,
there's less first dip
cupped nature of its front cavity exacerbate things?
Beyma 12cx – outdoors – ground plane
An externally hosted image should be here but it was not working when we last tested it.
X15 loaded with a familiar set of Beta 12cx indoors in a small room vs two K12s - I did not offset any trace
so you can see Beta12cx was somewhat lower in output - subjectively it played a big odaiko at startling dynamics
without a lot of cone movement.
An externally hosted image should be here but it was not working when we last tested it.
look at the similar sized Acoustic Control 115BK – even with its vent blocked,
there's less first dip
An externally hosted image should be here but it was not working when we last tested it.
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Small AND Short ?
Yes, it seems to be too short, too small and too open to do any good. Is there something I am missing ?
blakklassie
Yes, it seems to be too short, too small and too open to do any good. Is there something I am missing ?
blakklassie
here's a cute set of "K3" (-believe in Thailand) - - what is the smallest fullrange K to reap benefits and merge with a woofer/subwoofer?
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Those look really pretty Freddi - they would make a great set of desktop speakers. I am not sure if there are benefits to a K design when this small - the low freq must be up in the 150 to 200 Hz range. Have you ever listened to a K3?
I have K5 loaded with Faital 4FE30 - sound pretty good - a different cavity shape and aperture may get better graphs. I think it may be ok to make mini Ultra-Fidelity style Ks for tweeters. (I've used a KSN1005 with a cardboard coupler - a 25v distribution transformer run backwards can give >100dB sensitivity for piezo) Where do you think a tweeter coupler would have the most effect?
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here's the K5 with 4FE30 - little straight cut wings - its a decent driver for what it is
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