I currently have a SX-315 Pioneer receiver that is 5.1 surround with corresponding wire terminals for each channel including the passive subwoofer. I want more bass so I want to hook up a powered sub. There is no specific RCA out for a LFE line or Sub line, but there is TV in, Audio in and Audio outs in the back. Could i simply just run a pair of RCA cables from those Audio outs to the powered subwoofers audio in? Or is there another way? Thanks for the help.