You might want to read this first. It seems it's not simply a matter of watts.
http://www.sanderssoundsystems.com/technical-white-papers/magtech-regulated-power-supply-wp
Then read the review in the February TAS.
http://www.sanderssoundsystems.com/technical-white-papers/magtech-regulated-power-supply-wp
Then read the review in the February TAS.