It's a Panasonic TX55GZ950B and I'm using the ARC HDMI ports on the TV/Soundbar with a decent HDMI 2.1 cable. The Sky Q 2TB box is plugged in to the TV via HDMI.What have you got the soundbar plugged into? e.g. port type, TV?
Music and movies sounds really good and it states Dolby Atmos on the Soundbar so I'm definitely getting the correct signal.
The only issue I'm having is when watching Sky channels such as ITV HD, some of the audio just sounds a bit off and a bit tinny or echoey. I can't seem to get the setting right... I have the Subwoofer set to 6