30-Jun-2016, 14:21
Here is what f1eng had to say about Titanium tweeters:
I am bemused by the suggestion of a Ti tweeter. With few exceptions (Be, B) most engineering metals have more or less the same specific stiffness, that is to say ratio of density:modulus.
Titanium is quite a bit heavier than aluminium, so a titanium dome of the same weight as the existing aluminium dome will have to be thinner. Since the bending stiffness is proportional to thickness cubed that means a Ti dome will break up at a lower frequency than an Al one. On top of that anodising Al leaves a hard coating which may well increase its stiffness still further (I haven't checked the modulus of the aluminium oxide anodised layer).
So whilst this may be a better tweeter than the current one it won't be because it is Titanium.
As far as metals go only Beryllium has much better properties for tweeter domes than others, Magnesium may have a touch higher breakup frequency than aluminium, which will be slightly higher again Titanium if each are the same weight, since the less dense materials will be a tiny bit thicker.
I am bemused by the suggestion of a Ti tweeter. With few exceptions (Be, B) most engineering metals have more or less the same specific stiffness, that is to say ratio of density:modulus.
Titanium is quite a bit heavier than aluminium, so a titanium dome of the same weight as the existing aluminium dome will have to be thinner. Since the bending stiffness is proportional to thickness cubed that means a Ti dome will break up at a lower frequency than an Al one. On top of that anodising Al leaves a hard coating which may well increase its stiffness still further (I haven't checked the modulus of the aluminium oxide anodised layer).
So whilst this may be a better tweeter than the current one it won't be because it is Titanium.
As far as metals go only Beryllium has much better properties for tweeter domes than others, Magnesium may have a touch higher breakup frequency than aluminium, which will be slightly higher again Titanium if each are the same weight, since the less dense materials will be a tiny bit thicker.
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