Whenever I turn my subwoofer (Mission 70 ASE) on or off it makes a "poping" sound. I've read some posts on this forum about the pop when you turn the subwoofer off, and most people say it harmless. But my subwoofer also always makes the sound when I turn it on. Turning it on first or last makes no difference. Does anyone know why it makes the "popping" sound? Is it bad for my sub? For a while I just had the sub always on. But even when it's just in stand-by the top of the subwoofer gets warm. I don't know if this is bad for the sub.