I have a mini shelf system and I noticed that it only has a R,L connection in the back for auxillary. I just recently bought a subwoofer and surround speakers for my dvd player. They can connect to my dvd player. I noticed on the subwoofer it has connections where you could connect a stereo. Unfortunately, it didn't work. Is there any way I can make a sound output from my shelf system to the subwoofer?