Both these calculators produced required watts beyond my equipment specs. The typical listening level for movies sits near a max level for required wattage and possibly beyond on more limited occasions so a separate amp for that system is still required.
Listening to music while cooking in our kitchen, 21 feet or 7m from the main system with 91dB sensitivity at 85dB preferred sound level (slightly louder than JohnK's preference) and 20dB of headroom provides for 309W (or 389W w Allegro).
The amp is only rated for 225W aside, best case scenario.
Obviously i have not attained such conditions successfully.
Buy as much power as you can comfortably afford if you are a person who likes to turn things up and/or step further away from one's system.
