What's the scoop on the old Jensen Corp "Advent" speaker by H. Kloss?

I have recently come into a pair of these grand old speakers that feature the 'fried egg' orange tweeters that were once a big hit.  They also have a switch to change power or drive attached to each one.  I would like to know everything about these before I tear them apart to reuse the cabinets.  

Any and all information will be appreciated.