Replacement capacitors exploding

@jamessheyser- If you have blown woofers, Klipsch used 15", 8 Ohm, Eminence, in most of their stage monitors.
     Parts Express carries a wide variety.     Eminence sells direct.    
ie:  https://www.eminence.com/speakers/speaker-detail/?model=Alpha_15A   
and: https://www.parts-express.com/search?order=relevance:desc&keywords=15%22%20eminence     
     The drivers you have, probably were obsoleted, some time ago.  Someone like Bill, at Millersound, if given model numbers from the backs of the woofers and horns, could probably give you any pertinent info.    
       You may discuss having them re-coned, or buying new diaphragms which would save a few bucks  
                     http://www.millersound.net/speaker-reconing-millersound.html   
       If you're in the Central Florida area, try these guys;  
                     https://www.centralfloridaspeakerrepair.com/   
       Don't tell the guys at CFS I sent you.     They'll inflate the prices!  
        I was their competition, for a few years.      Then again: that was forty years ago.

Some are definitely 4 ohm (stock). I have three generations of these so it's hard to know what is or is not stock. Even some of the Klipsch K-43 drivers seem different. And some for sure aren't stock. 

@jamessheyser-    Again: try contacted Millersound, with the driver numbers.    He should be able to fill in the blanks (ie: even whether stock, or not), for you.  
       
          Another avenue, far as possible OEM driver info:    https://www.klipsch.com/support-nav

Why it was necessary to replace??
if you connected them backwards, they will explode 🤯 

@czarivey - "Why it was necessary to replace??
if you connected them backwards, they will explode"

There is no, "backwards" with non/bi-polarized capacitors!!   🙄