The reason why many of us like and use pulp type cones is that they provide excellent self damping charateristics. That being the case, less of a filter can be used to accommodate the transition into the next driver. There is no doubt that some of the more rigid materials do certain things better but they also ring harder and require more filter to remove the resonance. IMHO, in my high resolution designs designs, I have found that component coloration (sounds and resonances of capacitors, inductors, resistors and wires) are much more objectionable than the problems that reduced rigidity generate. Then again, my drivers are more heavily damped and use carbonfiber to add rigidity the cone. Low mass, excellent self damping potential and rigidity, the necessary mix IMO for a superb transducer.
Bobby@merlin
Bobby@merlin