PS: You can stream music from your iPhone or Mac directly to the Beam via Airplay2 without going through the TV.

The Beam has only one HDMI input. Connect everything to the TV, connect it from the TV with an HDMI cable (ARC -> i.e. the picture and sound go from the TV to the Beam) to the team. Select the input (PS, Apple TV etc.) on the TV or the TV is the "control centre".

Alternatively, you could take the TosLink output from the TV with the enclosed adapter and connect it to an HDMI cable through the adapter and connect it to the Beam that way. But you would go directly via HDMI, your TV can do this (ARC).