The mouth radius of a horn like in #10238 (DS8-T12?) will be very difficult to bend without siping or steaming even using plywood as thin as 4mm.If you started like this with a square mouth that is made from Flexi-ply and a laser cutter (cheap and very easy!- this would take 30seconds machine time)
Those that cannot access a laser can draw out the coordinates on the wood manually
You would have to check/be careful of the max Bend radius, (looks ok by my guess)
Multiple layers to reach around 12mm thickness are required to keep the wood non resonant.
We are talking about this - https://www.aresca.it/multiflex-the-flexible-and-bending-plywood/#.YrcXOuzP0uU
Couldn't be easier. Of course more than one layer may be required.
Couldn't be easier. Of course more than one layer may be required.
The ply is a special type with a rubber middle layer and vineers on both sides that run in the same direction. The stuff can be rolled into approximately 200mm ring without signs of cracking.The mouth radius of a horn like in #10238 (DS8-T12?) will be very difficult to bend without siping or steaming even using plywood as thin as 4mm.
Multiple layers to reach around 12mm thickness are required to keep the wood non resonant.
All plywood is bendable, but I'd never seen plywood with the fibers all aligned in 1 direction before, thanks for the link.We are talking about this - https://www.aresca.it/multiflex-the-flexible-and-bending-plywood/#.YrcXOuzP0uU
Couldn't be easier. Of course more than one layer may be required.
Definitely opens up construction not possible with standard plywood!
The petal version of the CE360 is here
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6794755
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6794755
so obviously bandwidth is AMAZING. but its really not as smooth as your axisymmetrical designs. do you think it would be clearly audible? wouldn't the best still be a large axisymmetric? Are you just weighing up the ease of construction here? For good engineering always need to balance these two ofc. are you hoping do listening tests against your large old ones?...can be as good as this (480 mm mouth size / 1.5" throat):
I am, of course. But at the same time it was a sort of a revelation that the shape itself doesn't cause any problems regarding smoothness - see #10,175 where it was in an infinite baffle (the intuition just doesn't work here). It's all about termination.Are you just weighing up the ease of construction here?
As for the audibility, my guess is that this already approaches a threshold where it doesn't make a clear difference.
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- Of course axisymmetric is still the "purest" form of the device, but if made (e.g.) an octagon I now think one could get quite close to the overall radiation pattern and smoothness - with the advantage that it will be pretty easy (with the flexi plywood) to make it any size desired.
As I already have rectangle I can easily modify the code to make 8 or 6-sided polygons just by shifting the position of the corner point, still preserving the 1/4 symmetry. For anything else I would have tp rewrite much of the code and I'm not sure it's worth the effort - the are actually no parallel walls even for a rectangle. Yes, it's symmetric, but that's a circle too (far more symmetric) and it works fine.
No, there are no "opposing parallel surfaces" in any horn (except where there actually ARE parallel surfaces )You could argue that for a circle, only a extremely small surface (infinity small) has an opposing parallel surface - no?
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It can be symmetric though and then round is the most symmetric shape you can think of.
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