Nvidia Shield audio playback poor

I’ve tried playing around with the Kodi audio settings since installing because the playback from streamed content isn’t very clear. It’s like everything is being passed to every channel. I’m running the latest versions of both from what I can see.

I have the unit hdmi connected to a Denon AVR 3313, which in turn has a dedicated arc enabled connection to my TV.

Audio is fine using YouTube on TV and Shield, it just seems to be Kodi where it’s sounding strange and almost have to concentrate when listening.

I’ve read a multitude of suggestions to change in the kodi audio section but does anyone have any suggestions?

Thanks

PS – I hope I’ve posted this in the correct forum section