Just one Y-adaptor for the front and another for the rear, the center can be hooked up with mini to RCA.
This is what I am planning to do. I don't know if this is what you meant.
I am planning to purchase this and plug it in where my speakers are currently plugged in. Then I will plug in the red and white wires from the adapter's end to my receiver red and white.
Or maybe I can just buy this and plug in the jack to my speaker port and than the red and white to my receiver.
Is that all I would need to do?