Western Electric 757A Clones

Well I finally finished my WE 757A's. Its been over a year in the making and a few bucks but I did it. The sound is Absolutely Glorious. Those WE engineers are GOOD! I have built the cabinets based on the original dimensions and got the front baffle as close to the original material as possible. I was fortunate enough to have seen a real 757 in person to study the front baffle material. For the drivers I used a 802 for the HF and a WE 728b for the LF. As for the horn I am using a 3D printed KS12027. A few years ago I tracked down a Original KS12027 and sent it off to a Commercial 3D printing company this spring to be replicated. A lot of time and money went into it but in the end I have a exact replica of the horn. In a blind test you cannot hear the difference between the two.
 

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Well I finally finished my WE 757A's. Its been over a year in the making and a few bucks but I did it. The sound is Absolutely Glorious. Those WE engineers are GOOD! I have built the cabinets based on the original dimensions and got the front baffle as close to the original material as possible. I was fortunate enough to have seen a real 757 in person to study the front baffle material. For the drivers I used a 802 for the HF and a WE 728b for the LF. As for the horn I am using a 3D printed KS12027. A few years ago I tracked down a Original KS12027 and sent it off to a Commercial 3D printing company this spring to be replicated. A lot of time and money went into it but in the end I have a exact replica of the horn. In a blind test you cannot hear the difference between the two.
Very nice build. It would be interesting to know what you did for a crossover.
 
Very nice build. It would be interesting to know what you did for a crossover.
I'm trying different crossovers at the moment and haven't settled on anything yet. The original crossover point will be tried along with running the 728b fullrange and moving the HF crossover point up and down the scale.

Unfortunately I don't have any build pictures on my computer. I still need to transfer them off my phone to the PC.

I do have a couple of Horn Strength test videos on my instagram rcanut1
 
I adjusted the throat ever so slightly to make it accept a Altec 802 or any other 2bolt pattern 1" driver. I think they are a better in certain ways than Altec stuff. The big difference is the 728b. That driver is unbelievable! Also the horn has a larger dispersion (90x90) so the sweet spot is bigger. Pretty much I agree with what JE Labs wrote in his blog about this speaker compared to the Altec 753. They are both Great speakers.
 
So other than the bent throat, is the 12027 different than the 12025 in other ways?
Over the years I've stored various articles on my computers related to WE horns and drivers. An article from a WE publication called the Western Electric Oscillator, Number 8, July 1947 had a lot of interesting information about various WE drivers and horns. It included the following comparisons of the 12024, 12025, and12027.

WE Osc July 1947.jpgKS horn comparison.PNG
 

je2a3

Senior Member
So other than the bent throat, is the 12027 different than the 12025 in other ways?
I've never heard or even seen a KS12025 but the specs and looks seem closer to the KS12024 with greater horizontal dispersion.

However, if memory serves me right, J-Rob didn't think highly of KS12025 when he compared them to the WE32, KS12027 and 12024 at the Silbatone Museum in Seoul. Horn theorists have a bias against bent throats, time delay, smearing of transients, etc. But my empirical mind (and practical experience) tells me that the bend makes them easier to blend with dynamic LF drivers without the claimed adverse effects.
 
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