If you are just bi-amping and using part of the original passive cross for the tweeters you should have some protection. I tri-amped, but my crossover is high enough so that I could put a 20mf cap in series with the tweeter lines. This impacts about 900hz or so, which is more than an octave down from my crossover.If I were you, and you are really concerned, I would consider an electronic circuit breaker with nano-sec response time on the tweeter parts of the array. There are places that build these, and failing that there are a number of EE types on the PE forum who could design one for you and you could put it together.
I would be happy to find one of those guys for you if you wish. He'll charge you for the design, but it would be worth it, and you could always make a bunch and sell the rest to the line array world. I'd be interested in purchasing one myself.
Marlboro
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