I'm a bit confused about what your asking .. I assume your trying to bridge the amp and your confused about the RCA cables. What you need to do is get 2 sets of female to two male RCA connectors (you may mean these by "y-plugs"). Plug each one into the RCA you should have ran. Take the one you pluged into right (red) and plug one side into front right and the other into rear right. With the other, the left (white or black) pluge one side into front left and the other into rear left. Make sure you set the gains and everything for the front and rear the same.