I went ahead and ordered a pair of RCA splitters after reading a review where someone successfully hooked them as two inputs/one out. I opted for right-angled pair which had reviews mentioning a solid and all-metal build (while a reviewer of the Monster one mentioned it being metal plated plastic, LOL).
I'll let you guys know how it works.
I'll kind of miss A/B'ing sources, but that's more of a nerd thing rather than serving any real function.
Edited by gsilver - 10/3/10 at 9:04pm