It will depend on the way you are delivering signal to the amp. If you are taking a left and right pair (as in using Y-splitters from just the front RCAs), and splitting it into two bridged channels, it will be stereo. If you are combining a left and right pair(running front to channels 1&2, rear to 3&4 or similar) and then bridging, you are creating a mono signal for each bridged channel (front would be a mono signal, and rear would be a mono signal). It is essentially up to you.