DIY construction of concrete speakers / first experience and mistakes

DIY construction of concrete speakers / first experience and mistakes
Hello! I decided to try making a concrete speaker with my own hands.
didn’t work very well:
- the shape is curved, the edges are not clear
- broke the concrete near the speakers
Any experience is helpful !!!
I'll make a new, stiffer shape and angled speaker holes.
I wonder what will happen next time?
Friend, subscribe to the channel if you are also interested in various experiments with acoustic loudspeaker.

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