In Reply to: DC, a stupid question for you posted by Chris B on April 02, 1999 at 16:40:39:
Yes, they are the passive (as opposed to electronic) crossovers that are included in the component speaker set from most manufacturers.
They prevent highs from reaching the midrange speakers and they prevent bass from reaching the tweeters.
I use them in conjuction with the electronic crossover in my amplifier. The crossover in the amp blocks the bass from 70HZ and down from hitting the midranges...this keeps the mids from working too hard and dramatically increases their power-handling ability.