Unless you have a couple of additional stereos with analog input lying around and you want to combine all of them together, you're better off just sticking with L/R channel stereo. Depending on your budget, you could maybe start with an upgrade to 2.1 channel; get yourself a cheap powered subwoofer. Even doing that may be an improvement over plain stereo. But as it stands, you're not going to be able to do anything without spending money for more equipment, unless you happen to have individual stereos lying around the house. (I've done that before and arguably, it's better than nothing, if you have the gear and the space).