Coded the CCC so it is down to line level inputs.
More midrange but amp needs re setting up now.
So today had a go and completely mucked it up.
Switched the amp setting to line level inputs.
Set it up quickly as it was getting dark. Have the loud whine noise back again, which I have worked out is the water pump.
Sound quality ruined and not as good as it was with the speaker level inputs but I think this is just more fine tuning that is needed. At least the gong and other car noises are now at the correct volume and the volume control goes all the way up without any distortion because the head unit amp is now not being used.
Will try and fine tune it over the weekend.