== A crossover is a filter, usually located inside a loudspeaker, used to limit the range of frequencies applied to one or all of the drivers dependent on which frequencies each driver can reproduce.==
Wow, I don't think that I have ever seen a more technical explanation of anything in my life. To explain this explanation
Different frequencies produce different types of sounds. Low frequencies make deep sounds, and high frequencies produce high soprano type sounds. Different speakers handle different sounds. A tweeter can't handle deep bass. and a bass speaker can't handle soprano.
A cross over is a filter that takes high frequency and sends it to the tweeter, low frequency and sends it to the bass, and everything else goes to the midrange.
Filters are a very interesting, but rather complex topic. Study it until you understand it. It's quite interesting. I took a class on the subject recently, and was very confused (crappy instructor) and one day when I wasn't even thinking about it, I woke up and the fundamental just came to me. Good luck, and feel free to ask more questions.
Eric B.