--ROB ------These tweeters are not bad at all , these are Atlas Alnico HR-3 ,as per your reply - metal horn, very good sounding from what is said on the web and they extend higher if not just as high than the K77 - the difference is they are 16 ohms , which means they draw 2x less power , you can't overload them which is a weakness of the k77 and it could the reason for swapping these , since the earlier k77 from Klipsch was also a 16 ohms tweeter ----just plug them in the right way , test them , they sound good to you , call it a day -