A few amp questions that have been lurking in my mind. 1. Will 200watts @ 4ohms be louder than 200watts @ 8ohms? 2. Will a 410 with a 800watt power rating be louder than a 410 with a 400watt power rating when the same amount of power was used on both, lets say 200watts? 3. Is there a sound difference if a cab is on feet/casters vs. just the bottom of the cab on the floor/stage?