W.O Swinyard US 2020166 filed 1935 “Sound Reproduction Apparatus” - a wedge-shaped 20 degree coupler with “V” deflector having non-parallel walls. KARLSON AND KARLSON-RELATED SPEAKER PATENTS Ps a few patents related plus Karlson's stuff C-N may offer some info in the future and has worked with K's for a long time.Ī K10 should be able to pack a good whallop - I didn't have a grat small coupler going scale with Emiennce 10cx but doesn't mean someone esle might do somewhat better - although rough, mine played strong. Maybe someone besides C-N will eventually look at various Karlson and Fulmer & perhaps from a different viewpoint. Here's a 5" k built by C-N's son based on Karlson's little "Rocket"/asymmetric projector - may sport a k-tube from coaxial's domeĪngles on coupler's taper look like 6 & 12 I'm not a good carpenter and lack tools/skills to to nice work C-N feels taller/narrower aspect could be of advantage. Hi John - from what little reports, CN"s 10" coupler bsaed on box above was good and he kinda liked 208 sigma in high aspect k8. Then see if it could be "beat" within the same bulk as maxium. If you have a strong and good 15" coaxial then K15 might be a good start and fun. for look at aspect which might be triedĨ" Fostex coupler by CN - later had thicker panels due to flex and Carl probably ran slot all the way up with "V" above the ~1/2" aperture gapġ0" test coupler by CN about 10 years ago - later would have "V" extenstion Here's a couple of coupler built by Carl N. This board never appeared in smaller coupler. vent and a front deflecting board to partially cancel a 250Hz null. K15 was finalized in the summer of 1951 and had 30 degree baffle tilt, dimensions of 33x18x18 (possibly 17 depth for first model), ~40 sq.in. I don't know how good small coupleres might be made.īesides MJK, Martin Poppe is very alive and well and would converse on Karlson. There will be very little damping in the rear chamber and damping beyond this can kill the sound.ĭrivers with weak power response like B20 are not suitable. The upper board may have some forwards cant and an upper reflector might be of benefit. RTA is nearly useless besides seeing general LF.Ī new test-mule k-coupler should have removable wings and other adjustments available. A few variants were built and I tested 32x16x21 coupler with 23 degree baffle and 10 degree port board using 15 and 18. I don't have saw, etc to build new test-couplers. The original Karlson with good 15" coaxial is not a shabby thing and can play good kick drum and bowed bass which seem to be sticking points for reflex. This gives them (on a good day/recording)) a more live and palpable character than direct radiator The effect is adjusted by baffle angle, slot gap at top, coupler width, wings taper.Īccording to one builder, slot's inductance is one part of the low prequency behavior and that rough model might be in Karlson's 1952 Audio Engineering article. A Karlson coupler probably should have hard finish in the front chamber to aid with "reverb".
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