With this setup, I have no sound when playing JP3 Dolby Digital but it works fine with DTS. I can't figure out if the problem is with the RP56, AVR1602, or the optical (instead of COAX) digital connection between the two. The AVR1602 does detect the DD signal since it displays it when the JP3 DD option was chosen. JP3 is the first DVD I am having problem with. I have a strong feeling the problem is with the digital connection but unfortunately the RP56 does not have a COAX output for me to test. Does anyone have a setup like this or similar (RP56 or AVR1602) that they can test both the optical and coax connection for any differences?