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Your receiver probably has a built in crossover which is used to strip bass signals from the fronts, center and surrounds and send the bass to the subwoofer output.

This normally works better than wiring the sub to your front speaker wires since (a) the crossover in the receiver is normally sharper and higher quality, (b) the receiver crossover can process signals from all channels, not just the front, and (c) the crossover in the receiver can actually remove the LF signals from the smaller speakers so the amplifiers and speakers don't have to do as much work, giving you clearer sound particularly at high volumes.

If you use the crossover in the receiver (ie the sub line level input is hooked to the sub out jack on your receiver) you want to set the crossover on the sub to either "disable" or the highest possible frequency to make sure that you don't have two crossovers working at the same time.