I have been wondering about this for awile. If a speaker has a given sensitivity rating of say 90dB @ 1m/1w, this tells me that it will be fairly loud with only one watt of energy going to it a little over three feet away from it. Why is it then, that most speakers have a minimum rating of 20 watts? And some times will handle several hundred? Well, if what I have seen is correct in other posts, going to 2 watts should produce 93 dB and 4 watts should produce 96 dB and so on at 1 meter. After thinking about this more I realized something. To get to 108 dB, (average high-moderate listening level) is 64 watts. 111 dB would require 128 watts and so on. This is through a single speaker. Adding more probably confuses things more.

I hope this helps anyone who has wondered this.

I hope this helps anyone who has wondered this.