30Hz 18" Tapped Horn Design

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I ran some Shape Optimization simulations in Fusion 360 for the internal bracing.

You apply a load, and constraints, and it tells you where you can remove material. I'm not sure how accurate my inputs and outputs are, but it couldn't be worse than randomly drilled holes.
 

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A compression chamber seals the driver from the horn and the rest of the environment. What is depicted as "20" in figure 6 in post #37 is a throat chamber, not a compression chamber, if it is to be called a "tapped horn".

My mistake, I should have typed DEcompression chamber.

The point is you can add a chamber before the throat to lower the compression ratio in a tapped horn.
 
I ran some Shape Optimization simulations in Fusion 360 for the internal bracing.

You apply a load, and constraints, and it tells you where you can remove material. I'm not sure how accurate my inputs and outputs are, but it couldn't be worse than randomly drilled holes.

With pretty bracing like that, the enclosure deserves at least 1 plexiglass side panel!
 
I built it! Twice. Screwed it up the first time, redesigned(simplified) and tried again!
(Redesigned with help from Alethia Sound!)
 

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The final hornresp charts

(measurements to come!)

Given the physical layout of that TH, S1 seems to be off, and the expansion between S3-S4 and S4-S5 looks a bit off as well. You might end up with a more accurate model using the "TH1" option in Hornresp, which puts the driver at S3 instead of S4, leaving S4-S5 to be used to describe the expansion after the driver.
 

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