yustr

Let's go back a step. Your LG sub has decoding and amplification capability built in. I can't tell for sure from the LG site (crappy support for older systems) but it appears that you have to feed it a digital signal - co-axial - let it decode it and it will send that signal out to the 5 speakers.

If this is true, my previous advice is worthless.

For it to work you need a sound card that has digital surround output. If your sb0410 doesn't have one you're sol. (Also a crappy site - very hard to navigate).