AC3filter, Matrix Mixer or FFdshow should be able to do that, thought im not sure if they were included in klite.
For example from ffdshow audio filter, just change the "output speakers configurations" from default stereo to "quadro"

Media player classics HC. or combine with ffdshow to use more filters to perform realtime resizing, deblocking, denoising and more.

anyone know an independent software that auto downloads album art when playing the song? i mean a software that runs along with another player. something that functions as minilyrics but for album arts.