I've just come into possession of an SWR Goliath Senior. This thing can put out a hell of a lot of power (like 1000 watts?!) and I was looking around for a head for it and I keep finding ones that say they are like 400 watts. Does this mean I will only be using 400 of my possible 1000 watts if I use this head? There are so many numbers, I just don't know what it all means!