lets discuss Karlson

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#81
So, I suggest that with the long cut you no longer have much loading of any sort and the "Q" of the system is greatly reduced, thus the ripples are also reduced.
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Look at that graph under the heading "Direct Comparison." Loading for the k-tube and the angle-cut tube appear nearly identical. (Though the tester notes that there might be some variance in proximity effect, mostly between the uncut tube and the other two).

I agree that an impedance sweep would tell a lot.
 
#83
Here's an interesting post on the Karlson forum:

Made some experiments with my tractrix tube (changing the slot a bit, making the whole tube longer with about 4" closed tube at the driver.
This is getting interesting. The measurement is at one point this time, 2m above the tube, 25° to the axis of the tube. I would also say it's louder now...
Smoothing is 1/24oct
I can't believe the phase. If this is correct, it would be awesome. Also the group delay is within 1ms.
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#89
btw here's some K-projects by Carl - a one-10" Karlson type subwoofer augmented his 8-10" Scan-speak midbasses

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#91
AudioBuffToronto said:
Hi all. I've built a pair of K-15 about 20 years ago, and with a half decent amp, they make my walls rattle. I've put in 15" StudioLab drivers in the cabs, and horn 12" mid and piezo tweeter. At 103db 1/watt-meter, I'm happy.
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Hi Audio Buff

I'm pleased to hear your Karlson K15's are keeping the local plasterers busy !
103 dB for 1 Watt is brilliant efficiency, thanks to the Karlson.

What kind of 12" mid horn did you use, with the 'Ultra Fidelity Enclosure', is it top mounted ?
Do you have any photos of your Karlson build ?

Cheers

Simon
😎
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#92
c2cthomas said:
Hi freddi!

I've been reading your input over on Magnetar's thread about his OB's and got interested about "the Tube" (k-slot tweeter).

I'm working something up that will be an OB - but not as big as Magnetar's :bawling: (can't afford THAT). Chops has an interesting prototype over on his thread but it uses a very big horn that presents a space problem for me. 🙄

I want to toss together one of your "K-Tubes" (do you have a name that you prefer to have them called?) for HF and intend to use the B&C DE10-8. PE has the Eminence APT-3 adapters as well but this is where things start to get a little fuzzy for me. How to mate the driver plus adapter to the K-slot. :scratch: Maybe when I have the parts I will have a BFO (Brilliant Flash of the Obvious :bulb: ) and thing will seem clear - buuuuttt you have already been there - done that - and thus the question. I have a Dremel set and understand your drawing posted at Magnetar's site - so no problem making the tube - I'm just unclear on how to assemble the parts. I'll be glad to post some photo's as I go along if it would serve to help others out.
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Hi c2cthomas

How did you get on with the Karlson K-tube ?
Did you try it with the B+C compression driver ?

Cheers

Simon
😎
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#93
kenpeter said:
Oh, I don't buy 6th order or 8th order or tapped horn theories tell the whole story.
This system is a synergy of too darn many things that defy such simple equations.
Maybe if someone wants to run CFD over the entire enclosure into a half space,
that sort of math might mean something.

I more than half suspect this thing is shaped to throw a vortex that propagates
and disperses somewhat different than the usual rule. Hardly the only weird trick
being simultaneously exploited to advantage...
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Hi kenpeter

Thanks for your exellent drawings in the other thread.
Are you a K15 user by any chance ?

I have now seen fig.8 as well as fig.6... Mmmm...?
I have been pening a couple of Karlson variations myself.
I have now downloaded the 3 main Karlson patents, but have not had time to read them yet.

One interesting thing that I realised in drawing the Ultra Fidelity Enclosure to scale was, the front radiation obviously totaly misses the floor, I presume avoiding the annoying first floor reflection of all vertical baffle speakers.

When drawing the K15, I drew the driver first and then the box around it.
In doing so I couldn't help playing with the idea of a diagonal bottom rear chamber with a 2nd internal reflector inside.

I am continueing to draw out a few variations.

One of them became a kind of isobarik, double-ported cab. with 2 sets of wings, inspired by the Metro PA design.

I'm sure reading the patents will raise some more questions.

Cheers

Simon
😎
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