There are no outputs or inputs like you are looking for. Your best bet will be a line converter. This will tap into an existing speaker wire and allow for a rca line out connection. Here is one like I am speaking of.
http://www.savinglots.com/lotprod.asp?item=SNI15
Feel free to contact me with any questions or if you would prefer a second opinion! Good luck!
ALWAYS MORE THAN HAPPY TO HELP! FEEL FREE TO CONTACT ME WITH ANY PROBLEMS! THANK YOU FOR USING JUST ANSWER!!!!