Hey guys, I have set my Apple TV 4 Audio to pass through my Apple TV 3 which is connected via an optical cable to my home theatre system. Problem is, I'm only getting 2 speakers working and no full surround sound. I have made sure that Surround Sound was set to Dolby Digital in Settings, but still don't get my other 3 speakers working. And yes, the movies I'm watching are all in Dolby Digital, as I tried it on my ATV 3 and got all speaker's working just fine. Please help!