@ pkarthik......
Can u just post a screenshot of the rear of ur 5.1 speakers?
Coz AFAIK, the FR, FL, & all u mentioned, are meant for connecting the woofer to the satellites? I too have similar sort of thing. But thats still "Audio Out" into ur speakers. And so there shud be something for "Taking audio in". And that can be ur Coaxial, or ur 2 channel analog in......
----------
I assume u know what is meant by the acronyms FL, FR, etc. though!