Epson projector connected to Sony Blu Ray 4k player via HDMI and HDMI audio out to Sky Devialet Soundbox but no sound. I have tried various settings on the sony but had no joy. Projector connects via hdmi to sky q and sky q connects to soundbox via optical and sound works great. Can anyone suggest anything? There is no optical port on the dvd so would an optical to hdmi work? There are two hdmi ports on the sky soundbox.