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This is done because the sub will have a crossover in it. This means that the signal is being split into parts. All the low frequency content (everything up to somewhere between 80-120 Hz depending on who made the stuff) is fed to the subwoofer. Everything else is sent to the smaller speakers that don't do as good a job at reproducing bass content. A good majority of recievers do this internally anyway. They have something called Bass Management that filters everything below 80 Hz and sums this information with the sub channel. This gives the .1 channel a little more action than the occasional explosion and also allows manufacturers to use cheaper main speakers since they don't have to output the low frequenct content.
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mmmm.... pudding
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