I am assuming one of those headphone jacks is a stereo output.

You need a mini-plug to RCA cable. You could try something like this:

http://www.amazon.com/Audioquest-Evergreen-Audio-Interconnect-4inches/dp/B005VQGQE2/ref=sr_1_7?ie=UTF8&qid=1433164967&sr=8-7&keywords=audioquest+cables

This one is 1 meter. Not sure if you need a longer cable but at $35 is an awesome price.

For these analog cables I prefer something a little better in quality. Audioquest makes an outstanding cable. There are more expensive and less expensive cables available but this will absolutely do the trick. You will plug it into any of your unused analog inputs that are not phono inputs.