This Crossover network provides three frequency ranges
1 Low Pass Filter
2 Band Pass Filter or Mid Range Output
3 High Pass Filter

The Low Pass filter output is to drive the dual magnetic subwoofer with very low frequencies to provide extra deep bass
Band Pass filter or butter worth filter or mid range frequency output is to drive the mid range speaker to cover up the mid range frequencies providing a realistic sound
High Pass Filter is to drive the tweeter which gives you a very relaxing soft shrilling sound.
The combination of three produce an ultra high quality sound.

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