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Old 23rd June 2019, 12:43 AM   #11
freddi is offline freddi  United States
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Karlson secrets
excerpt from Karlson's 1961 letter to Poppe

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When Karlson referred to the 12 inch cabinet having a parabolic front chamber , did he
mean the K12 introduced around 1956 and published as a project in the July 1958 issue of Popular Mechanics?

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Old 23rd June 2019, 02:15 AM   #12
GM is offline GM  United States
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Any duct with parallel sides with a straight taper will be parabolic, so this has two parabolic sections, but no clue what the summed flair is, especially once its expo shaped mouth is factored in.

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Old 25th June 2019, 10:03 PM   #13
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Karlson secrets
hey GM & guyz - what do you think would be the best way to sim this Thai "mini Karlsonator" for 18" from a MrFlexy YouTube video in Hornresp ? - eyeing, chamber ratios look 2:1. Having a vent "blowing" towards the narrow part of the aperture may have some effect.

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Old 25th June 2019, 11:57 PM   #14
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Karlson secrets
just looking at Mr Flexy's "Mini Karlsonator" for 18" as a series bandpass box, gives a pretty poor response. IF it works, then perhaps the narrow portion of the aperture is doing something not seen in the BP6A model - ?

The inner port area may be more like ~460 sq.cm. - but that doesn't seem to help the response curve shape.

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Old 26th June 2019, 04:52 AM   #15
freddi is offline freddi  United States
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Karlson secrets
I'd assume the K- aperture is fairly useless - but may tune it a bit lower

with BP6 series input the published spec of cheap Rockville 18 with "90 oz"
magnet structure, look ok.

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