What can be learned from this? Regretfully I’m not sure what has the best response here
This is the manufacturing process I'm thinking about -
1) 3D-print ribs with grooves as the petal joints,
2) glue petals made of perforated cardboard into the ribs - this should create the overall shape of the horn,
3) cover the front side with petals cut of thin sheet metal (glue them to the ribs),
4) coat the back side with something that will glue together the (perforated) cardboard and the metal sheets.
Should this not be enough damped, another layer of metal sheets could be put at the back side.
Perhaps the cardboard could be replaced by (perforated) sheet metal right away.
The aim is to have a light and well-damped structure.
1) 3D-print ribs with grooves as the petal joints,
2) glue petals made of perforated cardboard into the ribs - this should create the overall shape of the horn,
3) cover the front side with petals cut of thin sheet metal (glue them to the ribs),
4) coat the back side with something that will glue together the (perforated) cardboard and the metal sheets.
Should this not be enough damped, another layer of metal sheets could be put at the back side.
Perhaps the cardboard could be replaced by (perforated) sheet metal right away.
The aim is to have a light and well-damped structure.
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No idea. I chose an arbitrary structure because I thought it looked neat then measured it with different lengths. Since I did it I thought I'd share it in case it helped anyone else.
There were some indications that the segmented shape could be very smooth indeed: https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-7331853
Increasing the number of segments, i.e. approaching round shape, lead to a slightly worse response, from which I gather it helps to further break the axial symmetry this way. At the same time the radiation pattern is virtually the same as of round. That's all I know for now. It may not be a significant difference but certainly noticeable in the data.
Increasing the number of segments, i.e. approaching round shape, lead to a slightly worse response, from which I gather it helps to further break the axial symmetry this way. At the same time the radiation pattern is virtually the same as of round. That's all I know for now. It may not be a significant difference but certainly noticeable in the data.
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It should be also possible to print the basic petal sheets quite easily, directly in the shape - this is 1 mm thick:
I haven't tried yet but perhaps this could form the basic construction instead of cardboard, perhaps even as a damping layer.
Thin metal sheets would then cover one or both sides.
I haven't tried yet but perhaps this could form the basic construction instead of cardboard, perhaps even as a damping layer.
Thin metal sheets would then cover one or both sides.