Go read one of your friends' manual's and get back to me. You're right, it is a bass restoration device. You just don't understand how it works. The epicenter adds bass where there was previously none in the signal. This is a fact, and you can use any word to describe that process you'd like...the point is, you pass the epicenter a full range signal and it creates bass in the area you specify with the wide + sweep controls. It creates this bass from looking at the full range signal you pass it; if you pass it a crossed over signal, it simply has less data to work with...it'll still work, though, as long as your original source material has bass below that crossover point. If you pass it a crossed over signal it becomes an easy way to add massive amounts of low low freq bass to your existing sub signal. If the epicenter didn't actually add any bass to the frequency, only amplified existing bass frequencies, it'd just be an EQ. Which it isn't.