Is there a way I can connect a pre-pro to my Denon AVR-5803? The AVR-5803 has no pre-amp inputs. I connect video to my projector via HDMI directly from my DVR and my BD player. I connect audio to the AVR-5803 via 5.1 RCA interconnects from my BD player, and I connect audio to the AVR-5803 via optical cable from my DVR. I am very satisfied with the audio quality of the AVR-5803 and would prefer to keep it in my system, but it could use a connectivity update, if I could figure out how to do it. Any advice would be appreciated.