I’m afraid it is not possible from the description and looking at a couple of screenshots to tell what might be going wrong. There is some kind of issue with the surround. The dome and waveguide look reasonable but letting 3D CAD programs make meshes for BEM does not normally work. Not using symmetry and trying to simulate a very large system as a first try is likely to be counterproductive. My advice would be to start small with the waveguide until you have validated what you have and for the 6 inch and larger driver in a big baffle Vituix will give a pretty reasonable answer with its diffraction simulator much faster and easier.
Thanks for the advice ! You are right, I have been cutting corners here. I will start again with a basic and symmetric cube around the WG and using gmesh for the mesh until it works.
Then only I will try different dimension and shape of baffle for the WG integration.
Then only I will try different dimension and shape of baffle for the WG integration.
Fluid, I would like to ask you if you think this strategy would be appropriate to design a WG for a 3" dome mid (D7608/faceless version). I understand your construction method, but the WG diameter and depth seem to have been chosen ah hoc for this tweeter. If you think this strategy could work with a cone midrange, and given a constraint (coming from the C-C distance to the tweeter) of the WG diameter to less than 19cm, what depth would you suggest?
Edit: the surround diameter is 91.7mm, the intended use is around 500-2.7k
Edit: the surround diameter is 91.7mm, the intended use is around 500-2.7k
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You certainly could use the same principle. A constant radius is a good way to introduce a waveguide effect and incorporate a smooth termination in one single profile. Exactly how the dome would respond would have to be tested. The other simple alternative is a straight conical profile with a smooth termination added. I doubt it would do anything bad as these profiles are fairly agnostic to the dome being used but to have any effect at lower frequencies the size of the profile would have to be increased according to wavelength.
