Hi. If you're just talking about two pairs of speakers, one of which is being powered by the Crown, then you aren't running both pairs off of the same amp. While the Denon might power both the "A" and "B" speakers from the same amp (I don't know if it does or not), you aren't using it's internal amp for your front speakers. If you want the front and rear speakers to play the same signal, you could just hook up your rear speakers to the "FRONT" R/L speaker connections on the Denon while keeping your front speakers hooked up like you have them (Denon pre-outs to the Crown amp).