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.