@@MarkSWilliams27 さん Thank you for your compliment. Daiso is a trading company that deals in low-priced products, not a speaker manufacturer. I think it would be best to choose a full-range speaker of about 8 cm.
I am very struck by the beauty of this sound, I saw in another video a summary of the phases of the construction of the shell speaker. Would it please be possible to have specific measurements for the creation of the same?
Thank you for your comment. I wanted to salvage the Mazda rotary engine housing that was discarded about 8 years ago and make a speaker out of it. I've finally finished installing the 10mm acrylic plate. I'm currently considering what kind of speaker 🔈 to choose.