We finished our outdoor patio and fireplace next to the pool. I had planned a TV over the fireplace, and ran CAT6 wire from the fireplace to inside the house 30 feet away on advice of the GEEK SQUAD (thru the now sealed off ceiling). They mumbled a lot a technical geek stuff and using "BALUN's" which I had never heard about before. Now due to COVID19 virus - they won't come out to complete the install, so I have had to figure this out on my own. I included the photos and wiring diagram below. Most of the time we plan on using the smart TV using WIFI (Netflicks, Hulu etc) so the TV will select the input, and I think we need to use an RCA over ethernet adapter (a BALUN) to bring the audio from the TV over the fireplace, into the house where the AV receiver/amp is, which then will feed the sound out normal speaker wires to the 2 outdoor patio speakers. This is represented in the highlighted yellow pathway. The alternate function is the signal going the opposite was - for example playing a DVD inside the house thru the Onkyo receiver which sends the sound to the speakers, and will send the HDMI signal to the fireplace via HDMI ethernet/CAT6 adapter (BALUN's again) similar to the last picture. My question - is there a better way to do this as there are two sets of BALUNs being used (one for audio and one for video)? I don't see a way to use only 1 set as the HDMI BALUN is only unidirectional - but electronic and media are not my forte. Thank you in advance.