May sound stupid but I'm new to this. I have Definitive 7006 with have a 8" sub in each tower. I do not have a stand alone subwoofer. I was thinking about running the subs in the tower together into the receiver subwoofer outlet. My towers have a LFE in inlet. I was wondering do I need to use a RCA cable or would a digital coaxial cable? Also if it is the later I dont know where to find a 2 into 1 splitter for coaxial. Thanks for the help!