I forgot I purchased this some ~7 years ago when I was in high school. I found this in my room and then looked to see if I had any 3.5mm to RCA jacks lying around... which I did! So I plugged in this Belkin splitter into my desktop and then the speakers for my desktop (Infinity Reference 2000.4, got them for free \o/), into the splitter... and lastly, an RCA to 3.5mm for my TV audio out to the Belkin. :D
Works like a charm the only thing is that I have to set the volume a bit higher on my Panasonic receiver (which is straight from a CD speaker system I had years ago. I don't have any working stereo receivers so this is a (hopefully temporary) alternative.