Hi GM,
Yes, size matters.
I took another look @ freddi's Post #5, and the Faerber Equilibrium III now looks to me to be ~ 2"I.D. x 9"slot length x 34" overall brass tube length (or so). Now that might just get it down there.
I found an old audioassylum entry by freddyi that compares a big K-tube (K-coupler) to a tractrix Edgarhorn.
Regards,
Yes, size matters.
I took another look @ freddi's Post #5, and the Faerber Equilibrium III now looks to me to be ~ 2"I.D. x 9"slot length x 34" overall brass tube length (or so). Now that might just get it down there.
I found an old audioassylum entry by freddyi that compares a big K-tube (K-coupler) to a tractrix Edgarhorn.
Regards,
Attachments
I know the Edgar tractrix is very efficient - is the K tube just as efficient? If same drive levels then that is impressive.
Greets!
Right, to go low there's no replacement for displacement no matter how you shape it.
GM
With the Transylvania tubes there is no gain. Probably 6-9 db down from an Edgar horn in the mid band but Edgar horns need the midrange padded down to get the treble out of it so probably not that much difference.
Hi Y'all,
Some more of freddi's original pictures, that should go w/ Post #43 here. From - http://www.diyaudio.com/forums/subw...-simple-build-series-tuned-6th-order-180.html see: Post #1798 and 1802.
Regards,
Some more of freddi's original pictures, that should go w/ Post #43 here. From - http://www.diyaudio.com/forums/subw...-simple-build-series-tuned-6th-order-180.html see: Post #1798 and 1802.
Regards,
Attachments
Hi Pano,
I don't quite know what the angle distortion in that pictures is; but, I found some sketches by freddi, when I enter his dimensions into an AutoCAD drawing, it shows the K-tube mounting panel in the Karlson X15A having a slight forward/downward tilt of 16.96°.
I would be great if you could share some of your measurements. Sadly, I'm not in a position to measure anything at this time. Which is quite frustrating, as it makes it nearly impossible to learn anything objective about this subject.
Regards,
I don't quite know what the angle distortion in that pictures is; but, I found some sketches by freddi, when I enter his dimensions into an AutoCAD drawing, it shows the K-tube mounting panel in the Karlson X15A having a slight forward/downward tilt of 16.96°.
I would be great if you could share some of your measurements. Sadly, I'm not in a position to measure anything at this time. Which is quite frustrating, as it makes it nearly impossible to learn anything objective about this subject.
Regards,
Helped enormously, but not enough to fix 8" tube problems.
Perhaps radial K's over 10" EVM served as "protuberance"?
Note wooden adapter ring, not so obvious.
Large diameter Ktube = waste of time. Do not repeat.
Radial K cardboard thing = worth further investigation.
Perhaps radial K's over 10" EVM served as "protuberance"?
Note wooden adapter ring, not so obvious.
Large diameter Ktube = waste of time. Do not repeat.
Radial K cardboard thing = worth further investigation.
Attachments
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I also say stick with 1' ID k-tubes for 1 inch format drivers if one wants smooth response - its probably OK to extend length if needed for a tube to work in a klam, poke through a horn wall per Faeber, or reach the front aperture plane of a deep regular Karlson.
Carl had a list of 'gain' vs tube diameter - without graphs I could not figure out what was happening.
Carl had a list of 'gain' vs tube diameter - without graphs I could not figure out what was happening.
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Hi GM,
Post #51: "...draw a straight line from the throat/pipe center-line through the slot's mean pint?"
I don't know where the mean point for a slot like this would be? The claimed intention is to completely release all acoustic energy in a gradual manner w/o reflection back into the K-tube. I'm taking a stab @ it in the attached drawing, so ~8.7° v. 16.9°?
I'll attach my drawing of freddi's X15A sketches, w/ a 1/2 ellipse development of the 1.875"I.D. K-tube.
I guess, this still qualifies as a large K-tube, somewhat similar to the von Langa tube freddi posted in Post #1. If I'm getting what I'm reading, the experts (no pun intended, because I don't know what I'm talking about when it comes to Karlson and K-tubes) seem to have decided, that the 1"I.D. format of the Transylvania K-tube is about the upper limit; which bring up a number of questions: is the von Langa and Faerber stuff mainly decorative (?
?), and, what would be considered the lower I.D. limit for a K-tube.
Regards,
Post #51: "...draw a straight line from the throat/pipe center-line through the slot's mean pint?"
I don't know where the mean point for a slot like this would be? The claimed intention is to completely release all acoustic energy in a gradual manner w/o reflection back into the K-tube. I'm taking a stab @ it in the attached drawing, so ~8.7° v. 16.9°?
I'll attach my drawing of freddi's X15A sketches, w/ a 1/2 ellipse development of the 1.875"I.D. K-tube.
I guess, this still qualifies as a large K-tube, somewhat similar to the von Langa tube freddi posted in Post #1. If I'm getting what I'm reading, the experts (no pun intended, because I don't know what I'm talking about when it comes to Karlson and K-tubes) seem to have decided, that the 1"I.D. format of the Transylvania K-tube is about the upper limit; which bring up a number of questions: is the von Langa and Faerber stuff mainly decorative (?
?), and, what would be considered the lower I.D. limit for a K-tube.Regards,
Will do. The laptop got rained into, and died. Should be able to pull the hard drive and get the graphs for you.
a 2' ID tube should work for a 2'' exit driver
nozzles patent Patent US3543876 - Jet engine silencer nozzle structures with tapered apertures in outer walls - Google Patents
nozzles patent Patent US3543876 - Jet engine silencer nozzle structures with tapered apertures in outer walls - Google Patents
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