I have a celestion s10 subwoofer that came as part of the avp3 surround package that i bought from unbeatable before christmas. Ive only just got my amp and think their might be a problem with the sub. It making a very loud humm as soon as it is plugged into anything and the input level increased past 0 at all. Ive had it plugged into the sub out on my amp, and just to test the L/R outs on my dvd player and my pc. As soon as its plugged into anything it hums loudly increasing the input level makes it louder and the crossover and phase knobs dont seem to do anything. It doesnt hum when just switched only when something is plugged in, even when i switch the amp off. Anyone got any idea?