You can probably buy a cheap adaptor to take advantage of the optical out from the TV, heres a link from Amazon.
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=optical+to+coaxial+in+adpator&rh=i%3Aaps%2Ck%3Aoptical+to+coaxial+in+adpator
If you go the external...