I just ordered some new surround speakers and want to configure my setup for 7.1. My Onkyo 787 only has 6 amps so I am going to use an old pioneer receiver to power the side channels. If I understand things correctly all I need to do is use two rca cables from the pre outs on my receiver to any source (like cd, dvd) in on the second receiver. Then I take the speaker wire from the side speakers into the left and right main speaker inputs on the second receiver. Is this correct?