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Karlson secrets
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Old 21st June 2019, 09:47 AM   #1
Zero D is offline Zero D  United Kingdom
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Lightbulb Karlson secrets

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I know several of us should be interested in this, especially freddi *

Unfortunately it's in French ! But he does write a number of useful looking simple calculations onscreen, which could prove helpful.

Vance Dickason's book is used as a design reference, so the English version can be located.

What i realised for the first time, with this build, is shown in my screenshot. It appears to me, to have these three design elements all working together, plus the usual elements in front of the cone, not shown in my screenshot.

The ones in front are seemingly a combination of a number things. Semi bandpass, Restrictor. And whatever you want to call the curved wing shapes.

So all in all, there's a lot going on ALL at once ! No wonder trial & error must be very frustrating building these.

What are your thoughts on my analysis ?
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Old 21st June 2019, 10:13 AM   #2
papasteack is offline papasteack  France
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Unfortunately it's in French !
I'll take a look tonight.
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Old 21st June 2019, 01:18 PM   #3
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Karlson's are the best!
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Old 21st June 2019, 02:36 PM   #4
freddi is offline freddi  United States
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Karlson secrets
I'm not good at figuring them out.

here's a tidbit - a letter from John Karlson to the late Martin C. Poppe which led to the development of Karlson's asymmetric projector series of "clam/klam" speakers with the Karlson AP100/Oliver Magna-Clam being the large portable model loaded with Altec 421 and K-tube with University Sound compression driver and the AP9C ceiling speaker for a 6x9 driver.

This letter also mentions K15's "shelf" function. According to the late Wayne Green, K15's prototype testing was finished sometime in the summer of 1951. The Karlson enclosure aka "K15" made its official debut at the 1952 Hotel New Yorker Audio Show.



Click the image to open in full size.
Click the image to open in full size.


AP9C - Karlson's stamped steel ceiling speaker for a 6 x 9 driver
Click the image to open in full size.

Oliver ad for the Karlson AP100/ "MagnaClam"
Click the image to open in full size.

my old klam15 tured out rather nice - its back chamber could be made smaller
and would shorten the structure by a few inches.
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John Karlson and Jess Oliver with the Oliver Phase III speaker
Click the image to open in full size.

Last edited by freddi; 21st June 2019 at 03:02 PM.
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Old 21st June 2019, 03:06 PM   #5
freddi is offline freddi  United States
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Karlson secrets
Karlson's two main speaker patents

Subjectively - sometimes = Karlsons are the best. Objectively, they can reduce distortion including modulation distortion. GregB's "Karlsonator" is an interesting variation and currently more popular than the originals. FWIW I prefer K12 to
Peavey's FH1. The slotted pipe tweeter is something else I would pick within its range and sensitivity for a practical
Karlson device.

Karlson's Ultra-Fidelity enclosures pretty much had a 2:1 rear to front chamber volume ratio. The Asymmetric projector, 1:1.

A slotted pipe is not a universal replacement for a horn but an alternative which may work well in a certain area.


Click the image to open in full size.

Last edited by freddi; 21st June 2019 at 03:20 PM.
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Old 21st June 2019, 04:20 PM   #6
freddi is offline freddi  United States
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Karlson secrets
@Zero D - yeah it has TH and front resonator elements. I'm not sure what the French guy's analysis will ultimately show.


here's a better picture of the Oliver Magna-Clam ad. (same as Karlson's AP100 which were once installed at Radio City Music Hall)

I think AP100 and the Oliver Magna-Clam had pressure relieve aperiodic vents on their baffles.

Click the image to open in full size.
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Old 22nd June 2019, 12:04 AM   #7
bentoronto is offline bentoronto  Canada
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Karlson secrets
When I went shopping for a HiFi system in 1956-57, Karlsons were all the rage. Leonard Audio in NYC had their second floor showroom filled almost exclusively with dozens of them in sizes from 8-inches to 15-inches (which is what we brought home). Fabulous sound, a perfect cello reproduction.

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Old 22nd June 2019, 04:51 PM   #8
Zero D is offline Zero D  United Kingdom
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I'll take a look tonight.
Thanks Looking forward to your input etc
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Old 22nd June 2019, 04:52 PM   #9
Zero D is offline Zero D  United Kingdom
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Quote:
Originally Posted by freddi View Post
@Zero D - yeah it has TH and front resonator elements. I'm not sure what the French guy's analysis will ultimately show.


here's a better picture of the Oliver Magna-Clam ad. (same as Karlson's AP100 which were once installed at Radio City Music Hall)

I think AP100 and the Oliver Magna-Clam had pressure relieve aperiodic vents on their baffles.

Thanks for All the links & info etc
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Old 22nd June 2019, 11:47 PM   #10
GM is offline GM  United States
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Originally Posted by Zero D View Post
So all in all, there's a lot going on ALL at once ! No wonder trial & error must be very frustrating building these.
It's an 8th order BP with an expo reflex slot, so yes, 'a whole lot of shakin' going on' .

Sorry, I have no clue how to interpret your analysis.

GM
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