@RobH72: If you're experiencing high levels of static noise then, as mentioned by @ghosty this may be down to the USB adapter that you're using. With this in mind you may wish to consider connecting a set of Bluetooth headphones or buds, to see if you notice an improvement. Also, if you haven't done so already, please head to Settings > Sounds and Vibration > Sound Quality and Effects > Dolby Atmos, and enable this option. I'd also recommend running through the 'Adapt Sound' settings to help find the best sound quality for you. Let me know how you get on.