Mix of titanium and silk dome tweeters

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Op’s probably asking about soft domes in maybe the front mains and metal in the rear, or some other mixing, although he seems hell bent on not saying what exactly he’s talking about.

Come on brother, you can do it, ask an answerable question.
 
I'd say a disadvantage would be if both types played the same part of the audio spectrum simultaneously. Comb filtering as was mentioned, because it's physically impossible to lay one over the top of the other; they have to be side by side, above / below and that finite distance between; comb filtering.

Now if you cross from silk to titanium at some frequency, then the problem goes away. That would be a 3-way, with just different frequency points for the cross than an ordinary w-m-t 3 way. Perhaps you can gain some advantage over running either the silk or titanium set alone, that could sell.
 
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Metal infused composites can work better than one material alone. Newer commercial airplanes are made from carbon fiber and titanium strands to protect from damage due to lightning strikes. Lamborghini uses a mix called "carbo-tanium" for their chassis and even suspension parts, so you know its tuff stuff.

Supplementing a larger fabric dome tweeter with a smaller diameter metal alloy dome is something Harbeth has done with some success, but its hard to predict vertical dispersion behavior based on the acoustical environment its being used in. They even run both tweeters wide open. Some people like a rear facing tweeter supplementing the front in or out of phase. I'm not a fan of this as it affects coherence of soundstage and imaging in a euphonic way. It just sounds unnatural to me with acoustic music and vocal soloists.
 
I was looking for speakers similar to my idea and I found this one:
 

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