I've always been running a Marantz SR6200 to drive all of my speakers. Recently I picked up a Moon I-5 integrated amp to drive my stereo configuration and I must say its absolutely stunning. So logically I decided to use my SR6200 as a pre/pro. When connecting the L & R preamp outputs to the I-5 I get no sound. The rest of the channels play out of the Marantz and the volume adjustment even works through the A4 "HT Bypass" input on the I-5. Any clue why I am getting no sound out of it? Yes, I checked all my cables and input selections on the Moon.