ajsons
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Posts posted by ajsons
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I think they tried to keep the "linear expansion" idea in the design.
The designers chose three straightest parts of the horn to analyze the flare rate. Point A (throat) to B (the corner in question) expands at a fast rate, which turned out to be 97hz. A full Huygen reflector will result in a narrower distance between the corner of the doghouse and the reflector, and will appear to have a lower (incorrect) flare rate. The designers should have chosen a point B before the bend, and put in a Huygen reflector at the bend.
Armando
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Check this one also, from the Martineli website.
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Did you see my post in updates and mods about a compression chamber?
I was recently wondering about the effect of different slot sizes on both sides, not a circular opening on one side...
A double filter?
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Ok, now I remember where I saw that.
No extra expense on electronic filters would be great.
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Which thread is that? My memory is as short as my legs. But I do remember seeing the formula from the thread. The're not showing above.
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Another solved mystery.
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Dana, I think you were posting while I was scanning.
Piece 12, the motorboard, is 1-1/2 thick, with a circle cutout. It looks like a compression chamber.
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Here's piece 8.
This is most likely, a coincidence, but one of the Speakerlab plans calls the motorboard piece G.
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Here's piece 12.
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It looks like it is a removable motoboard. The cutout though is a circle (piece 12), bolted to piece 8 with a cutout like a 6 x something.
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This may sound stupid, but the Georgian uses the same motorboard, with a 6 x 13 opening, and the Georgian plans I have calls the Klipschorn....... a type "K".
Which one had that kind of motorboard first?
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It makes perfect sense to me. PWK knew when to change hats. The 1945 construction plans were using 3/4" plywood. He changed that too. It's clearly "shaved down a bit".
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I'm afraid I have not seen DIY plans for a midrange horn in that range.. I saw a picture of a wooden copy of an Altec 811's expansion, but there were no plans. I'll see what I can find though.
Armando
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Here's the part to build it.
It seems logical that the horn would work better with it, based on earlier posts by Dana, but somehow Klipsch dropped the idea for whatever reason. Maybe a full Huygen reflector is needed, vice a radius reflector, something that's probably worth looking into.
Armando
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As far as the Khorn splitter, it is a simple Heugen reflector, and does not create a constriction at the throat cross-section as the available channel area on each side of the wedge is over 1-1/2" in width, the same as 1/2 of the throat cavity opening (3"). It merely turns (splits) the waveform into the bifurcated horn channels which are 3" in depth vs. the 1-1/2" of the "slot".
If it is not used, then the driver would be subject to 180 deg. reflections from the front board directly back toward the cone.
DM
Here's one that I find rather interesting. The other "throat", at the TAILBOARD.
A copy of the 1945 Klipschorn construction plans was sent to me by forum member ap sass. (Remember, the patent was in the same year, April 1945). The 28 sheets of the construction plans were drawn at different times in 1945, from what I can see. Anyway, here's something we don't see in the patent drawing. A simple Huygen reflector at the tailboard.
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I'm very happy with the construction and sound. Dana has done a great job here. This was a long "run" to put the pictures on the forum and I hope someone find it interesting. Later on I think more will be added when it come to my mind!! [
]Flemming
Flemming,
You did a great job on your horns! I have a copy of the construction plans too (TNX, Dana!) and I've been comparing the plans, not only with your pictures but with the Khorn and Jubilee plans as well.
Those who are thinking of building Khorn clones from Speakerlab plans should take a serious look at this design as a better option. It is simpler to build as can be seen from Flemming's pictures, and with more flexibilty on driver selection (i.e. not limited to the K-33). The use of Huygens reflectors and no twisting of the horn channels ensure a more accurate reproduction of the wavefront. And it does what the Jubilee was designed to do (two-way) with a smaller footprint. Of course you can make it three way like Flemming's.
As I'm already committed to building two sets of horn systems this year, it'll be next year before I can start on mine.
You got a great system there, Flemming.
Armando
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It works! Don't stop now, Flemming.
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Come on, Dana. Post some more pictures . We know he's got two.
The "ability to turn" is part of your design concept of the V2, isn't it?
What's his impression of the V2's?
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Bill,
I have another question for you if you don't mind.
My eldest son is doing dj work on the side, and wants me to build a pair of PA speakers for him. I have several plans plus the ones that D-man sent me. I was thinking of building a pair of EV Eliminators. How do these compare with the industrial La Scalas?
Armando
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Bill,
The H600 is a nice midhorn, although I find the T30 a little harsh.. I won this one on ebay. Been looking for a second one for a stereo pair. Let me know if you want to part with your H600.
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Gil,
Which driver will you use on "The Caves" thread?
Armando
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I just checked my speakerlab-k construction documentation...it specifies a slot of 3X13. if that is the case...do we still want to recommend a PA Bass driver like the 15L? I also checked my ACR Swiss EckHorn construction plans, it also has a 3X13 slot. The ACR Swiss EckHorn used a PA-38, which is a wide range full range driver (40hz - 4Khz) spl of 101 db at 1 watt. Think that the driver considerations for a K-Horn should center around what type of slot your k-horns have. If you have a 3X13 slot, a k-33 type driver should be considered. if you have a 6X13 slot, and would not mind less low end, the PA Bass drivers are an option.
The initial horn section under the motorboard starts wit a 78 sq inch opening. Why use a 39 sq inch (3 x 13) opening for the motorboard? It doesn't compute for me.
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Welcome back, Dana. I miss your posts!
I was going to send you an email tonight, and was reading your past emails about an hour ago.
I still will email you though.
Armando
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La Scala Horn
in Technical/Restorations
Posted
This mod doesn't take a lot of work, if you have a split La Scala and completely reversible. Have the La Scala facing down to the floor, add four legs about a foot long, and you got a floor horn. Then put in the room corner. Sort of a mini-Monolith horn (Edgar's).
In a corner, the horn will exhaust through the (new) front and one side.
The legs can be a totally separate assembly, with horizontal crossmembers, and the enclosure just sitting on it.
Armando