“speakers continue to hum when surround sound off i had to replace my rocketfish RF_WHTIB when an electrical surge happend (was fine up til then). I installed a new one, but now when i turn my tv and surround sound system off, the two back speakers connected to the rocket fish still continue to make a humming noise. So I turn the volume knob down, but this did not used to happen. What do i need to do?”