Replacing tweeter in old Advent speaker?

Do I have to replace the crossover if I replace the exsisting tweeter with a "softdome tweeter"?
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You shouldn't have to change the crossover as long as the efficiency of the new tweeter is the same as that of the old tweeter... If the efficiency differs, it will play either louder or softer than the original tweeter, thus affecting the overall frequency balance and character of the speaker. I assume that if you're changing to a different tweeter type you would be changing both tweeters in the stereo pair.
When I had my Large Advent's in the 70's. The tweeters were always going on these beasts. I used to put a inline fuse to the speaker input. I can't remember the amp rating though. Most likely a 1 or 2 amp.