Hi, I have the same setup in the house and in the shop/cave which is flat screen tv, sony receiver with surround, dish dvrs. Both dish receivers have hdmi cable to tv. Have always had digital audio out cable from dish receivers to sony receivers to get dolby digital surround in both house and shop. Since I added amazon fire stick to hdmi input on tv in the house, I moved the digital audio cable from the dish receiver to the digital audio out on the tv to the sony receiver. now I get dolby surround sound from the fire stick and the dish. I did the same in the shop, but when I move the digital audio cable from the dish receiver to the tv out , i dont get dolby surround. The tv in the shop is a older plasma, but it has the digital optical out on the back, but i just get stereo sound, not surround. Plug the cable back into the dish receiver, i get dolby surround. any ideas why I don't get it thru the tv out?