I inherited a system where there is a coax cable that runs from the AV units to a designated wall plate in the corner of the room for a subwoofer. In order to connect them, I simply attach different heads onto them. Since I wanted to use off air antenna system to watch football games, I was thinking I could use the same cabling to connect an antenna. In order to do so, I would need to switch both ends of the in wall cabling for either the subwoofer or for the antenna when needed. Is this okay to do? Do I risk accidentally trying to send sound signals to an antenna?