You are supposed to replace them with the correct tweeter for your speaker; aka the same one ideally. Using a different tweeter would mean changes to the crossover would be necessary in most cases.
The floorstanding speakers i have are speakers I have owned for over 20 years. I guess I'm not that critical on sound quality since I only use these speakers for my backyard listening on nice summer days.
The OEM ribbon tweeter frequency as I recall, crossover at: 3500hz. Floorstanding speakers are rated: 250 watts, uncertain whether RMS or Peak.
I don't care to replace with OEM ribbon tweeters since they are prone to burning out.
Just want to replace tweeters for around $50-$75, used or new. I do understand the SPL should be rated the same.
Thanks