I am testing out my AD-20 before tonight. Tonight I will be going SBD > AD-20 > JB3. Right now I am using the dvd player for audio. I am using an optical cable from the ad-20 to the JB3 and using an analog mini from the dvd to ad-20. I am thinking this is my problem, and that it is not meant to take this cable. So is there anything else I should check or should I just try to find some xlr cables?