FWIW, I've pondered the idea a few times. A few thoughts on this:
- Unreinforced concrete can and will crack. You might consider fiberglass additive, like this:
https://www.amazon.com/32-500-4-Inch.../dp/B000CODWAE
- Formwork would be difficult. You'd want to incorporate the speaker and other cutouts in the form. Perhaps Styrofoam would be a good internal form material, since you could hog it out or use acetone to dissolve it. I think you'd also want to do a monolithic cast, since doing it in separate pieces would require a construction joint.
- Choose your mix wisely. Regular old ready mix has fairly large aggregate for the wall thickness you are describing. You'd probably see the aggregate, and have visible voids. In any case, getting a fine finish might be tough.
- Getting the concrete to fully fill the form without voids might be tough too. You might consider some way of vibrating the form during the pour to help the air work it's way up and out.
- Not sure what the best way to mount the speakers would be. Perhaps adhesive (silicone?)
- Unreinforced concrete can and will crack. You might consider fiberglass additive, like this:
https://www.amazon.com/32-500-4-Inch.../dp/B000CODWAE
- Formwork would be difficult. You'd want to incorporate the speaker and other cutouts in the form. Perhaps Styrofoam would be a good internal form material, since you could hog it out or use acetone to dissolve it. I think you'd also want to do a monolithic cast, since doing it in separate pieces would require a construction joint.
- Choose your mix wisely. Regular old ready mix has fairly large aggregate for the wall thickness you are describing. You'd probably see the aggregate, and have visible voids. In any case, getting a fine finish might be tough.
- Getting the concrete to fully fill the form without voids might be tough too. You might consider some way of vibrating the form during the pour to help the air work it's way up and out.
- Not sure what the best way to mount the speakers would be. Perhaps adhesive (silicone?)
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