[Eng sub] How I modify 3$ cheap speaker into a 3D printed back-loaded horn speaker

I have modified a speaker box of Daiso 300 yen speaker.
It seems that wood is usually used for the enclosure, but this time we designed and produced a speaker enclosure using a 3D printer. So it becomes a plastic enclosure.
The design of the back load horn speaker was based on the following link.
Reference: kanon5d.web.fc2...
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★ Parameter
Spread coefficient: 1.0
Pipe length: 85 cm
Crossover frequency: 200 Hz
★ Attention
This design is just one of many design examples. So this design method is not absolute. Make your own speakers that you pursue.
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