Optical and hdmi Arc audio output

I have attempted to connect my TV to my RS150 via both the arc and optical inputs. The problem is the output going to the amp is so low I have to have the amp at incomfortably high levels to be able to hear it properly. Is there some sort of obvious setting I am missing? I have pushed the output up from -5 to 0 db in the “volume settings for each source” but it doesnt seem to make much difference. Seems odd that both inputs have the same problem…

I think you will need to go into your tv settings and switch to fixed volume at 100%