Hopefully I don't get kicked off the board for being dumb but here's the question; Do you connect the LFE cable and the speaker wires to the sub or is the LFE cable enough?
Just the subwoofer cable. The speaker wire connection is only used if your receiver doesn't have a subwoofer out (like a two channel stereo receiver). And you can use a cable marked as a subwoofer cable, a coaxial digital cable or a composite video cable. They are all the same specification. But don't use the red and white audio cables.