cone breakup - diyAudio
when the diaphragm has unequal pressure over it it causes breakup faster. For round drivers its at the very outer edge. The naturaly shape of a linear convex cone is much stronger than say non linear or a flat piston.. its shape helps redistribute pressusre over a wider area. think about the SUPERDOME(who dat!) of any of the dome buildings that don't need bracing over huge spans in the roof. the 6x9s do share some of these properties but a non linear convex cone will always have uneven surface tension..
the limited bandwidth wont necessarily determine it being more ideal or "out of" the resonance. as you know higher mass and higher surface area usually equals a lower resonance. its a matter of testing the driver honestly..
A in its inherently weaker points. which are the edges. although even driver will have some flexing in the diaphragm the 6x9s shape causes even pressure across the diapharm