Roti, if I follow, you're just trying to make a stereo audio cable to connect your TV to your receiver so that the TV sound plays through your setup. Although it would be technically possible, you don't use speaker wire for that, but instead coaxial-type cable to connect to the RCA plugs. So, if you want to do it, you can buy some coaxial cable at RadioShack, Home Depot, etc., but these stereo audio connectors are available ready-made at so little expense that you should get one and not go to the bother with the RCAs you bought.
