I am trying to run a BIC DV-1210 subwoofer in my system. The probelm is the sub hums pretty badly when turned on. It has done this since I got it. At first I did not care becuase it was behind my TV. Now I am running a sealed shiva behind my tv and this sub will be solely for my rear speakers which means it is close to me I can hear the hum. My shiva is driven with the AVA-250 amp from Adire with a cheater plug on it and there it no hum. The BIC only has a 2 prong cord. Is there anything I can do to eliminate the hum? I have moved since I owned it and it has done it both places. Thanks for any help.