WP12027

Started on this project back in November last year. In more typical time, Should have everything wrapped up before Chinese New Year 2021. So I thought....

Modeled the KS12027 using internet pictures and quite a bit of internet sleuthing, (plus some help from a fellow Havenite who shall remains nameless for now). The 3D printed 12027 sounded pretty special. I thought it was just the horn to be casted in aluminum.

Pictures of the molds.
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First shots off the mold.
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These mating surfaces have to be machined.

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The finish is bead blast, then anodize.

Took 10 whole weeks to make the trip from the foundry! (Pre-Covid was around 4 weeks). Finally got them today.
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Hooked up to my 2-way test rig. Sounds really good! Well worth all the efforts and the long wait. Obviously, more listening is needed.
 
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WP-12027.

So, when I was working for WE way back when, the KS designation was interpreted as either Kellogg or Kearney specs. There was no authoritative definition. Regardless, KS specs were WE's designs manufactured in-house or farmed out to be manufactured by others. There were also the WP specs. (I think the WP stands for WE procurement.) The WP specs were for commercial designs but change-controlled by WE.

I am not calling this horn KS-12027 because it is not a WE design. The horn was "inspired" by the dimensions, size, shape, characteristics, design considerations of the KS-12027.... So, the WP-12027 designation is a better fit.

There you have it.
 
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It was a bit of an expense.
It still is a bit of an expense - about the price of a good WE 728B. But, the 3D printed horn showed such potentials that I had to follow through. I really believe there is something to: 1) slim horn profile, 2) internal vanes, and 3) 90 degrees throat bend. The combination of these three on a cast horn is just magic.

Currently 4 hours into listening to the horn. Audio feed is direct from the Triode Corp. amplifier. No driver attenuation. Amazingly, it has none of the harshness of the KS-12024. Translation: zero ear fatigue/ache typical of cast metal horns. Also, starting to hear the differences between the 3D printed version and the metal cast. Sound has "body" to it. More listening is needed....
 

MrEd

Senior Nobody
For now, I am using the A-55G driver from Bob Crites. Playing the horn solo without the woofer just to check for harshness and ringing. No crossover, no attenuation.... Really impressed so far.

I have a bunch of other 1" drivers to "experiment".
I'm liking this adventure so far.
Keep up the good work 😊
 
but custom casting your own take on them.
I had three extra pairs made in this round. Hoping to sell these to recover the mold tools, casting and freight costs. One set already sold to a fellow Havenite. Perhaps this little hobby can pay for itself??? Yeah right.

Here is another horn that showed great potentials in the 3D printed form. It's a modified KS-12024 horn with 25% wider horizonal beam and is for 1" drivers. It's a strong candidate for casting.
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