He has a 4 channel amp, so he needs to just Y connect the front and rear RCA inputs to one stereo RCA pair L & R, and match the gains... This will give the same input to both lefts, and both rights, therefore giving the same output paired left and right. This amp will not run a 2Ohm bridged load from front to rear, only rear L & R, or front L & R. With 4 - 4Ohm voice coils the optimum and most efficient performance is attained by using all 4 channels. Corey