I’ve decided to buy a Digital Optical Audio Switcher 4x1 SPDIF Toslink Switch Box to sort my lip sync problems with the Beam. What is the correct setup? I have a BT TV box and an Apple TV. Should the Beam be connected to the box as an input or output? Beam currently connects to HDMI (ARC) port on the TV. When using the box what connects to the ARC port on the TV? Thanks in advance for any help.