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Old 3rd February 2015, 10:49 PM   #1
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Default Karlson Questions

Hey howdy, kindreds. Still wacking away at parabolic vents here. Got a couple questions for you.

Are there any K-style subwoofer designs with geometries differing from the usual? I mean on purpose, with consideration and calculation afore thought. Such as, needing a longer taper to separate the lower frequencies more, or no need to go all the way up to a narrow point due to no high freq?

And, has anybody worked out the topology of the physical inverse of the vent, an appropriately curved reflector?
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Old 3rd February 2015, 10:57 PM   #2
freddi is offline freddi  United States
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approaching one as a series 6th order bandpass is logical as would be a transflex variant XKi - X's ab initio Karlson 6th Order Bandpass

Carl and Wayne used wider starting points for the aperture than usual as the aperture wasn't needed to work into the high frequencies
- - look at the subwoofer in the middle of this picture. This little passive radiator sub augmented eight 10" Scan-speak woofers in aperiodic boxes
Click the image to open in full size.

although not a real design from scratch, this design from TB46 with a Karlson-ish or "Nineleaves" style aperture
makes a smooth graph from 20 to 200Hz with an Infinity 1260W.
In this case, a round or rectangular aperture may have less "chuffing."

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

you can see one person just stacked up a few woofers
Click the image to open in full size.

Last edited by freddi; 3rd February 2015 at 11:16 PM.
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Old 3rd February 2015, 11:17 PM   #3
xrk971 is online now xrk971  United States
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A custom XKi can be made to hit just about any freq you want and have wide bandwidth and good cone control for high SPL. I have a design with a single Faital Pro 12HP1030 that can hit 120dB at 36Hz in a 2cu ft box.

A large Karlsonator variant like the MOAK which was proposed but never built could also work.

MOAK: The Mother of All Karlsonators (aka The Magnificent Monster)

Click the image to open in full size.

Last edited by xrk971; 3rd February 2015 at 11:21 PM.
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