If you want to protect the speakers from deep bass, get "bass blockers" from your friendly car audio store.

Aha. Now I know why he was asking that question in another thread. I replied there without seeing the explanation here. I was close to the mark in my guess, it seems.

And yeah, Bass Blockers will work, assuming that a crossover isn't already built in to those speakers. Don't worry about it until you actually get the speakers hooked up and listen to see if they really need it or not.