The best you will get is Dolby Surround (Left, Center, Right, & Surround) plus whatever emulation the LG can throw in. While the LG supports Dolby, I do not know if that is only internally from the DVD or if it would activate with the RCA inputs. Another issue is that Realtek dropped Dolby support some time ago so you are likely going to be limited to stereo (plus whatever emulation the LG can perform).