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In Reply to: RE: Conceptual idea behind Karlson posted by JoshK on September 11, 2007 at 14:59:54
John Karlson's "Acoustic Transducer" was included in his 1950's list of inventions and meant to add a type of reverb besides impedance transformation though a high-low pressure leak combined with coupled-cavity action. They were used for sound reinforcement at the 1964-65 World's Fair by Disney, etc.Karlson's (and type) couplers have 2:1 apparent chamber volume ratios. Karlson's "asymmetric projectors" had 1:1.
"K-horn" is common reference to Paul Klipsch's famous "Klipschorn"
Karlson had an odd/novel approach but IME was anything but "clueless"
1952
1st ad I could find
"A New Approach In Loudspeaker Enclosures"
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Edits: 09/11/07 09/11/07 09/11/07Follow Ups:
I've several pics of these and it seems split down the middle the number of Karlsons that have curve linear couplers and those that have exponentially curved couplers.
Which is 'correct'?
I'm guessing that back then people would have thought that was a LOT of money for a cabinet with no driver.Heck, it looks like a lot of money to me today
Good thing music reproduction was mono at the time!
Fred
Thanks for the great Audio Eng. links which proivide some clues to the science of this mysterious device. I wonder if Karlson ever had a conceptual problem with the (now) standard procedure for deriving the driver mass roll-off trend (Fhm) where 2Fs/Qes=Fhm in Hz. I wonder whether he would have thought that this was just a mind over mass matter, or if you expect it to be there it will be. I've tried some stuff like this with my rig, and the damn things just do whatever they want to anyway, no matter how hard I think about it. Maybe I'm doing it wrong. I wonder if Karlson would have thought that anyone using a driver larger than 10 to 12" did'nt understand the concept of loading the driver with a K coupler, or horn even.
Horn America wants to know, and the K is just a 2D horn!
Paul
Freddyi,
Are there any speaker manufactures building these nowadays ?
Thanks
there might be some coming up - here's K15 built currently in France w. 604
I'll take two in Mahogany. Where do I send my $300? ;-)
...when 34 1/2" x 22 1/2" x 17" was "small"!
Anybody know whether or not the Brentworth Sound Lab speakers are related to Karlsons? Looks to me like a bandpass loaded fullrange driver firing through a diffraction slot that doubles as a port, though I don't know the details of what's going on internally.
Duke
Greets!
Don't have a clue, but if you 'unfold' a K15 to make it long enough to equal its multiple resonant BW you'd wind up with a tapped horn of sorts, so they may have done something similar with more/same/less resonant chambers, vents to get a flatter response than the K.
GM
Loud is Beautiful if it's Clean!
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