Crossover settings.

I'm a newbie so I'm a little confused about this. Ordered my sub so I want to make sure I get it set up right when it gets here.
My receiver has settings to set a crossover point for each individual channel. The sub also has the knob on the back to set crossover. What do you do with the knob if you want to set different frequencies for different channels ? Is that not used ? I'll be plugging it into the pre out subwoofer jack on the reciever.
Bought a Polk Audio HTS 12.

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