New construction. I'm putting a Sonos soundbar on my living room TV connected to two in ceiling speakers in one zone and a TV with two in ceiling speakers on the patio in another zone. The "intelligent living" rep is telling me that I need a balun, connected to two ethernet cables to connect the patio TV to an amp that powers the two ceiling speakers because they don't run audio wire through walls. Does that sound right? Or can I just install an HDMI cable or a HiDef audio cable instead?