That is an absurd amount of power. Even this guy thinks it's crazy and dangerous:

https://sound-au.com/project117.htm "One flash and you're ash !" 260 VOLT DC POWER RAILS!

All you really need is 100 W for a good home HiFi. I have a set of the shorter Magnepan (forget the model) with a decent 100W Sony amp and at mid volume is too loud to comfortably listen to yet sounds very crisp and clear with a sealed 12 inch sub driven by a 150 W amp.