I would like to see a scan hear of that articel from Hobby Hifi, if someone with the magazine have the time for that.
Aczern,
Wow! Thanks for the scanned article. Truly fascinating. The performance looks quite good. At Freddi's recommendation (and he got me a CD to use) I have tried the K tube tweeter and it is absolutely smooth sounding and has a very wide and uniform polar pattern. The sound is beyond any intuitive sense that one might think it should sound like. It has the wide dispersion of a good dome tweeter (even better) and the high sensitivity of a compression driver by without the harsh spitting sound of a CD.
I can't read German but am guessing this is a field coil driver and that box is the could voltage source?
2nd order harmonics are high at around 1% throughout but higher orders are low(ish).
Probably because the coupler appears to be relying on diffraction which is something other horns try very much to avoid.
And yes it is a field coil driver and the box on page 3 is the transformer supplying it.
Probably because the coupler appears to be relying on diffraction which is something other horns try very much to avoid.
And yes it is a field coil driver and the box on page 3 is the transformer supplying it.
Thank you aczern for the article. Not exactly a straight response, but It can be worked with. Not much Hf extension. What concerns me the most is the waterfall plot around 8-10KHz, unfortunately it is problematic on all compressiondrivers I know. but we dont know what is caused by the driver and what is caused by the tube. Interesting....
hi aczern - thank you very much for the article. Here's a sound-file/"video" of generic crossover hooked up to my K18 - it has a clone of a ~1966 Karlson X15 K-tube ~7.25" long and 1.875" ID mounted above the 18" EV woofer. There's a short angle sliced tube at the throat. A later X15 K-tube appeared to be about 1.25" diameter tubing - I don't remember the compression driver as its been years since I've opened this cabinet. It has a curved reflector and 4 - 1" dowel rod struts on the wings.
its possible I think to get good sound with the X156 approach where the K-tube is mounted in the front chamber.
I have over a ton of horns but still love the Ks best 😀
BTW - when using a K-tube on top of a cabinet - I would consider experimenting with cardboard baffles
at the driver exit plane to smooth the low end and make a better match to the bass unit. K-tubes have a nice
high vertical window and seem to match midbass and bass Karlson couplers nicely. Transylvania Power Company
was the first manufacturer I saw to use a K-tube on top of a cabinet. That size at ~5.3" long, 1" ID and a half-ellipse
slot works well and easy to make of pvc/abs or those with good tools, brass or copper pipe.
K18
https://www.youtube.com/watch?v=XYsdJZA7coE
8 inch K-coupler topped with Transylvania Power Co. "The Tube" - that Dayton 250p driver has
high distortion - i need to rotate its coil and do some measurements - it sounds ok but is less sensitive
than a P-Audio BMD440 and the 440 measures much cleaner on this tube
https://youtu.be/T71pRwTGfuc
its possible I think to get good sound with the X156 approach where the K-tube is mounted in the front chamber.
I have over a ton of horns but still love the Ks best 😀
BTW - when using a K-tube on top of a cabinet - I would consider experimenting with cardboard baffles
at the driver exit plane to smooth the low end and make a better match to the bass unit. K-tubes have a nice
high vertical window and seem to match midbass and bass Karlson couplers nicely. Transylvania Power Company
was the first manufacturer I saw to use a K-tube on top of a cabinet. That size at ~5.3" long, 1" ID and a half-ellipse
slot works well and easy to make of pvc/abs or those with good tools, brass or copper pipe.
K18
https://www.youtube.com/watch?v=XYsdJZA7coE
8 inch K-coupler topped with Transylvania Power Co. "The Tube" - that Dayton 250p driver has
high distortion - i need to rotate its coil and do some measurements - it sounds ok but is less sensitive
than a P-Audio BMD440 and the 440 measures much cleaner on this tube
https://youtu.be/T71pRwTGfuc
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here's IG81's Transylvania Power Co. "The Tube" with a BMS 4550 - don't think the swamping resistor would be needed with 2nd order highpass nor with most compression drivers. A piece of PVC pipe will do about as well. I would expect a baffle at the compression driver's exit plane to help reinforce forward radiation on the low end. Experiment with cardboard, then once satisfied, make a nice looking baffle,
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