In late September, I received a message from Trieu, asking if I'd be interested in evaluating his 3D-printed prototype pair of multi-cell horns.
Design notes from Trieu: "These horns are slightly wider. The original KS12024 has a rather narrow 50° horizontal dispersion. When updated to the 1" driver opening, the wider initial diameter of the of the 1" driver would not allow for the throat geometries to work correctly. I felt the slim vertical profile of the original KS12024 is important sonically.
The best way to maintain it is to increase the horizontal width via a wider angle. So I increased the horizontal dispersion to 62.5° allowing for the proper expansion and geometries of the throat piece. BTW, I used carbon fiber infused PLA filaments."
For the record, I never heard an original Western Electric KS12024 horn nor its companion phenolic diaphragmed WE713B compression driver. However, for a complete technical and historical background of this horn and driver combination, Joe Roberts discussed them in the context of the late 40s Westrex L8 and L9 cinema speaker systems from the collection of Silbatone Acoustics + more here.
He also shared his thoughts about the Western Electric KS12024/713B, Azzolina KS12024, Emilar EH500, Altec 32A/C (post #125) in this thread. Note: J-Rob inadvertently was typing KS12025 but actually meant KS12024.
However, I have extensive experience with the Azzolina KS12024s, which are on extended loan from J-Rob. Even if the Azzolinas have a more front-row perspective, they were my favorite top of the bass bin mount horns.
Now they've been replaced by the WP12024s. Everything I love about the Azzolinas is preserved in Trieu's reconfigured version with wider horizontal dispersion + a bit more shimmer in the extreme top end!
I hope Trieu decides to put this horn into production!
For more details please go to my WP12024 upload.
Design notes from Trieu: "These horns are slightly wider. The original KS12024 has a rather narrow 50° horizontal dispersion. When updated to the 1" driver opening, the wider initial diameter of the of the 1" driver would not allow for the throat geometries to work correctly. I felt the slim vertical profile of the original KS12024 is important sonically.
The best way to maintain it is to increase the horizontal width via a wider angle. So I increased the horizontal dispersion to 62.5° allowing for the proper expansion and geometries of the throat piece. BTW, I used carbon fiber infused PLA filaments."
For the record, I never heard an original Western Electric KS12024 horn nor its companion phenolic diaphragmed WE713B compression driver. However, for a complete technical and historical background of this horn and driver combination, Joe Roberts discussed them in the context of the late 40s Westrex L8 and L9 cinema speaker systems from the collection of Silbatone Acoustics + more here.
He also shared his thoughts about the Western Electric KS12024/713B, Azzolina KS12024, Emilar EH500, Altec 32A/C (post #125) in this thread. Note: J-Rob inadvertently was typing KS12025 but actually meant KS12024.
However, I have extensive experience with the Azzolina KS12024s, which are on extended loan from J-Rob. Even if the Azzolinas have a more front-row perspective, they were my favorite top of the bass bin mount horns.
Now they've been replaced by the WP12024s. Everything I love about the Azzolinas is preserved in Trieu's reconfigured version with wider horizontal dispersion + a bit more shimmer in the extreme top end!
I hope Trieu decides to put this horn into production!
For more details please go to my WP12024 upload.
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