Crossover
Definition
A filter network that divides an audio signal into separate frequency bands and routes each band to the appropriate driver or processing chain — woofer for lows, midrange driver for mids, tweeter for highs.
In Simple Terms
A filter inside a speaker that sends low sounds to the big driver and high sounds to the small one. Each part of the speaker only handles what it's designed for, so nothing gets strained or muddy.