i don't think it works like that. the white and red are left and right stereo sound. each one is independent of the other and includes a + and - on each cable.
many years ago the last time i messed with rca jacks i ended up cutting the cable to get to the wires so i could do something similar to this. i'd have to look into it further but i'm pretty sure you'd have to cut one of the cables to connect the + and - to one end so it can work on the receiver.
but do some research first cause it been a long time and i rusty on my old audio tech