Point being I believe that the 2% more you may or may not hear with Cheaper drivers in a far simpler 1st or second order crossover its just not complex enough to spend 100% more or something for a very slight window of difference.. I am sure the VSF is a world class cap and in most cases is the true ceiling for the point of diminishing returns.. Again to me a critical application for a cap would be in a Full range electronic piece running the entire frequency range, or VERY complex multi driver type line array speaker..
But remember the cast was more or less developed to close the gap in the extreme case and really was more designed to overcome the lower voltage applications of the VSF.. The cast simply can take more power, my application and most other speakers especially being in the 90 db to 100 db efficiency range will never see that kinda power stress. You have to pick and choose your battles somewhere, my cutoff was at a point that the caps outweight cost and the performance of the possibilities in a speaker design themselves.
But remember the cast was more or less developed to close the gap in the extreme case and really was more designed to overcome the lower voltage applications of the VSF.. The cast simply can take more power, my application and most other speakers especially being in the 90 db to 100 db efficiency range will never see that kinda power stress. You have to pick and choose your battles somewhere, my cutoff was at a point that the caps outweight cost and the performance of the possibilities in a speaker design themselves.