1.1 via 3.5mm audio out:
If the projector is equipped with a 3.5 mm audio out mini jack, usually it is green and marked as Audio Out. Please connect a 3.5 mm audio cable between speaker and projector for audio output purpose.
1.2 via S/PDIF:
If the model is equipped with S/PDIF port. You can connect a S/PDIF cable between your
speaker and projector.
If your projector is equipped with Bluetooth out function(such as X10-4K/M2, etc.), you can turn on the Bluetooth out function of the projector, paired with the Bluetooth speaker and enjoy wireless audio connection.