Hi everyone, new to the forum! I just moved into a new house that was pre wired with two speakers built into the ceiling, as well as some wires coming out of the wall. Shortly there after I discovered 2 more wires bringing the total to 5 (7 if you include the 2 speakers in the ceiling). I was having my dish installed today, when the installer noticed seven coax cables in the wall behind my tv. He said this was for audio. It's been a while since I've had surround sound (except on my computer), and have never heard of using coax. Is this right? Is there one cable for each channel? Attached are a few pics for reference. If this is true can anyone recommend a receiver that would accommodate or the proper hardware. I'll be attaching a Dish 722 HD receiver, PS3 and Xbox 360. Thanks!