What would be involved in updating Hersey II’s to Hersey IV’s?

Having 30 years or 50 years experience of a brand has zero to do with now really, and the only Klipsch stuff I've ever paid much attention to are the "now" versions. Changes include vastly different driver materials, horn throat and phase plug technology, crossover components, internal wire...everything except how they look. I don't need to be "given" the efficiency part as that's only part of the tonal experience, and it seems that prejudice against a brand can last...remember the foam covered "L100" JBLs from the 70s? I do...relative to today they were not so great (a response curve like a big smile)...the new ones look exactly the same and actually are fine sounding (I heard 'em). 

I have been listening to Klipsch for over 30 years and they just arent my cup of tea.

But you keep listening to them?  I don't get it.

I do get that the Klipsch sound is not for everyone and have no interest in trying to convince someone that they're missing something.  I like the Klipsch speakers I have, but I own and have owned a lot of other brands, many that had a quite different sound signature and liked most of those too - Vienna Acoustics, Harbeth, Legacy Audio, Canton, Focal, Monitor Audio, Spendor, and others. 

I like some of these a lot better than Klipsch.  That doesn't diminish the listening pleasure I've experienced with my Klipsch speakers. 

If I thought they sucked I wouldn't listen to them for 30 years.  I don't see myself ever purchasing another pair of Vienna Acoustics speakers.  If someone was asking about different speaker choices and asked about VA speakers, I'd share my impressions, both positive and negative.  If someone already liked them and was posting about them, I wouldn't jump in a thread and tell them their speakers suck.  I also realize we all have different ideas about common courtesy and that mine may be different than yours.

Actually, having 50 plus years, owning and fiddling with a particular brand, has certainly had a tremendous effect, and influence, on how I have listened to recorded music, and gave me a " reference ", to every other design and model, by others, and in fact, similar designs. PWK made it possible, for many, to enjoy " his " designs, and Roy Delgado, has been applying some modern techniques, and newer, upgraded parts ( along with the likes of Bob Crites, Al Klappenberger, and Greg Roberts of Volti Audio ). So, those that received a very late intro to the genius of " the man ", I say wonderful....it is about time. Enjoy ! MrD.