I'm trying to setup a home theatre system running from my Imac M1 2021. I've got a USBC to HDMI cable from my Imac into an old Sony home theatre system. It looks like I've set it all up okay through Midi - it seems to recognise all the channels etc - but the side, centre and rear channels are playing out of my front speakers. Has anyone else experienced anything like this? Any fixes that anyone knows of?