Ok, I my Cornwalls have square magnet K77s. My center (Heresy) has a around K77, I have 2 other Heresies with round magnets. My thought was to remove the round ones in the Heresies (with type e crossovers and replace them with the square ones from the Cornwalls which have type b crossover. Then install the round magnets in the Cornwalls. Reason I want to do this, is it drives me nutts(ocd) that I have 2 different tweeters in my L/C/R.