I do not have an optical cable outlet on my tv so I'm not sure how to get my surround sound set up with firestick. HDMI 1 cable is set from TV to cable box. Firestick is plugged into the HDMI3 slot on my TV. The surround sound is plugged into the cable box with red/white cords.The tv is a Hisense..the surround sound is RCA.