shadorneYou've got the physics of that all wrong, what they're trying to do is get a pure pistonic behaviour without any cone flex, this is the ideal for pushing air without any "ring like a bell issue" that you get from cones flexing.
Easy. Stay well away from Marten ceramic drivers (accuton I believe). Get the Wilson. The sound of the Wilson Sophia 2 is extremely realistic - especially in the all important mid range.
Ceramic or rigid drivers suffer from the "ring like a bell" issue - lots of unrelated harmonics. Think about it - a drum set has cymbals - thin round rigid discs of hard metal - they sound great and have a long sustain with a multitude of vibrations after the initial hit - do you really think a cymbal would make a great speaker driver????
Cheers George