I have to ask if this is normal only I am sure it was not on my old Humax HDR. I have the 1000s connected, via optic fibre cable, to a Panasonic sound bar. With the 1000s box volume set to 0 only HD channels provide good volume through the sound bar. Going to ALL SD channels there is no volume whatsoever until I increase the box volume to almost MAX. I have carried out a factory reset with no resulting difference.
Is this normal for the 1000s.
When I switch to my Panasonic Smart TV, with signal through an element aerial, sound volume set to 0, ALL channels, SD and HD, play through the sound bar with ample volume.