I agree with most of this, however underpowering subs does not cause harm. Turning up the volume and gain levels on an underpowered sub or speaker is what causes harm. If a sub is rated at 600W RMS that doesn't mean it will always be trying to pull 600W of power. [QUOTE]

I agree with you xsports33, if you do under power the sub and have the gain more than 75% up, when you crank the volume on the head unit it will most likely start clipping which will quarter the life of any sub.