Female RCA to 2 x Female RCA Combiner Converter Jack Y Splitter Adapter

I bought two of these adapters so that I could connect two devices to the same set of composite audio inputs without having to manually switch cables every time I switch between the two devices. The issue is that these splitters will not function as combiners; if I connect two sets of cables to one side, I get no audio output from the other side, even if only one of the input cables is actually sending audio. Oddly, if I only connect one cable to each side, it works, no matter which side of the splitter I use.Maybe this is user error on my part somehow, but the product advertises itself as a combiner, and it ain't combining, so one star.

Works like it should. No hiss or added noise. Good job.