I am not sure what you mean by "one line level audio wire" but I have done this before. If it has a headphone input you would just use a headphone cord with the male plug on both ends. If it has RCA ports on the stereo then get something like this: Amazon.com: RiteAV - 3.5mm to Stereo RCA Male Cable - 6 ft.: Electronics
. You should get stereo sound as long as both the red and white RCA plugs are plugged in. If you want a longer cord just search amazon for "3.5 rca" .
Let me know if it works!