Basically I haven't got a clue what I'm doing ! I've set the amp up to tell it I've got a subwoofer and set the crossover on the amp to 80, but still have the front left/right set to large as they are floorstanders. I followed the brief setup instructions for the sub in the leaflet enclosed but haven't got a clue what the controls do. High Level Gain - this is set to min at the moment, what is this ? Low Level Gain - I turned this up until I could hear the sub Frequency - this is set to max 120 at the moment but not sure what it does. Phase - this is set to zero and yet again I haven't got a clue !