When I feed my left/right pre outs from my a/v to the A80, which are the correct inputs on the back of the amp to plug into, a bit new to all this, many thanks in advance.
I would recommend connecting them to the 'TAPE' input on your A80 and turning on the processor mode for this input and setting the input level to its maximum setting which should be pretty close to matching the gain level of your AV Amp.