On my experience, the size of the room & the volume you like to listen at have a huge impact on how much power you need for your speakers as well as their sensitivity. If you think about, the word “volume” applies both to the amount of db a speaker outputs as well as the cubic footage of the room.
As Audioman58 pointed out, musical peaks, both in the bass & lower midrange, can can easily demand 5- 10 times instantaneous peak power. I listen regularly in a large room ( over 6000 cubic feet) at volumes in the lower yo mid 90’s db’s & my 98 db sensitive Volti Rivals are barely using a few watts as indicated on the watt meter on my amp but when a loud peak comes, that can jump to 20 - 30 watts for a split second.
Btw, I’m sure many of you folks are not horn loaded speaker fans but if you like your system to easily boogey on any kind of music & sound rich, detailed & not hard without really breaking a sweat, check out Volti’s! As Greg Roberts says - “have fun!”.