Samsung & lg have both gone the way of no analog out now mate unfortunately .
HDMI or arc seems to be the norm now , I had to replace a perfectly good working Panasonic 5.1 receiver because my newer sharp aquos would not pass 5.1 via optical , only via HDMI arc.
The older lg plasma set I had had no such issue but the screen itself went faulty.
Hence I have an absolute spare of old av equipment which is worth nothing but I can't bear to part with :-/
Re sound bar - no you wouldnt need the CE cross with the soundbar , it has a DAC inbuilt capable of coping with Dolby.
Its a bit of a all in one solution in all honesty.
& you'd go straight optical TV out to optical in on sound bar.
Yes , you'd use the 3.5mm headphone out with a 3.5mm...