here is the deal, my cousin bought a new house and had the family room prewired for 5.1 speakers. so went to their new house to help things around installing fans and things like that. then look at the wiring to hook up to the reciever, opened the plate to see the wires that are not labeled and there are 6 speaker wires and 1 coax. 5 wires for the 5 for the family room and the 6th wire is for the patio. the coax is for the sub according to my cousin. i know i've been out of the loop for a while but is that what they use for a sub now a days, a coax?