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What have you built -tried for traditional Karlson in smaller sizes ?
What have you built -tried for traditional Karlson in smaller sizes ?
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Old 16th September 2020, 10:07 PM   #11
freddi is offline freddi  United States
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Cool - got pictures to show ?
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Old 19th September 2020, 07:58 PM   #12
EddieT is offline EddieT  United States
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Demolition complete, wings removed and shelf edge relieved in center to accommodate front mounting of PA-130. Note horizontal vent above shelf and slanted upper chamber beginning at vent. Next I will extend depth of rear chamber by three inches ( I haven't decided about extending the shelf), add foam core duct to vent then sand and paint exterior. I'll post again after completion.

I have a packaged blue tooth amp on order to power them that XRK linked on another thread. It will be a lot neater than my naked "lunch money amp".
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File Type: jpg 0919201526 - Edited.jpg (362.8 KB, 96 views)

Last edited by EddieT; 19th September 2020 at 08:19 PM.
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Old 19th September 2020, 10:18 PM   #13
freddi is offline freddi  United States
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that's some clean surgery ! your reflector should be pretty good
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Old 30th September 2020, 09:06 PM   #14
freddi is offline freddi  United States
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maybe someone here will give a smoothing stub a go sometimes

here's one idea on cramming a 12 or 10 into a small box to be augmented with a subwoofer. With a good 12 it might make a usable guitar cabinet.


Click the image to open in full size.

Click the image to open in full size.
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Old 3rd October 2020, 04:37 AM   #15
EddieT is offline EddieT  United States
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I had forgotten that my second venture into a K-box was based on a figure in a hard copy of a Karlson patent. It was driven by a 10" guitar speaker and would have been a natural for a smoothing stub. I don't remember what happened to it when I gave him the K15. I don't see that figure in the on-line patents.
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Old 3rd October 2020, 04:57 AM   #16
freddi is offline freddi  United States
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That's "Fig.1" from Karlson's "Acoustic System" US2896736 patent which went with the "Aural Optics" stuff showing a Karlson 12 laying on its back and "aimed" at a wall.

How well did it play vs other cabinets? what guitar and amp did you run? What was the lowest frequency it seemed to support?


https://patentimages.storage.googlea.../US2896736.pdf
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Old 3rd October 2020, 05:31 AM   #17
EddieT is offline EddieT  United States
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We didn't really test it. It replaced a typical open backed cab with a Tiny Tiger (Poptronics Meyer) 20W amp in it. It really sounded good compared to the OB but had a better amp too, the Southwest Technical Products MMM 60W kit built amp. The guitar was the Harmony H19 Silhouette. Then when I completed my pair of K12s I gave him the K15 with the Phillips FR 12" replaced with a 12" guitar speaker. It sounded much better but was heavy to transport.

I may have that 10" speaker in a K12 that's stored in the garage. It's facing the wall with stuff stacked on top so I can't see the front.

He took the K15 to college and kids in the dorm came to see what kind of stereo system he had, only to find that it was a guitar amp with a portable radio driving it (no stereo). They were impressed by the K15 cab performance.

Last edited by EddieT; 3rd October 2020 at 05:41 AM.
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Old 3rd October 2020, 07:21 AM   #18
freddi is offline freddi  United States
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looked up your Harmony - -really nice body shape - I always wanted a Supro with similar shape.

Also kinda large ("X15 size"), my Acoustic Control 115BK loaded with EVm16L. sounded really good with a late friend jamming (his love and specialty was playing The Ventures hits. The top was my Alpha Bass.

K12 sounded good to me with Cannabis Rex.

A lightweight but well-braced K12 or even k10 might make a fun and reasonably pottent guitar cabinet.

Here's an OEM Eminence 10 with 56oz magnet and qt ~0.25, mounted in a -.62 scale ("K10 size") K15.

It pretty well covers the bottom end of a regular electric guitar with E about 82Hz

(REW made a nicer looking graph)

Click the image to open in full size.

Last edited by freddi; 3rd October 2020 at 07:29 AM.
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Old 4th October 2020, 06:33 PM   #19
EddieT is offline EddieT  United States
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I am not going to get into in depth speaker testing, is the little Dayton Audio iMM-6 calibrated mike worth looking into or is my Chromebook mike good enough for relative testing? The iMM-6 is on sale now for $16.48.
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Old 4th October 2020, 10:19 PM   #20
freddi is offline freddi  United States
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it sure gets good review - I don't own a cellphone so can't take advantage

Amazon.com: Dayton Audio iMM-6 Calibrated Measurement Microphone for iPhone, iPad Tablet and Android,Black: Musical Instruments
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