I have headphones and small speacker set [2 speakers 1 sub] with aux cable which you can listen to an ipod on. Can I plug these speakers into the tv to make it work. there is two holes on the back of the tv where the cable can fit, but there is no sound, the holes are labelled [REMOTE - IN & OUT] Can I get some help. What should I do to get sound if I cant use my headphones or speakers

NEC TV Model number is PX - 42VM5W
Bought it today for $250