Just a little bit of info. A 100 watt amplifier will give you 20 db more than the sensitivity of the speaker. So if you start out with say 80 at 1 watt you will get 100 db at 100 watts at 1 meter. They used to rate amplifiers with those figures in the 80's. A live rock concert is from 110 to 120 db. I could achieve those kinds of sound pressure levels with my Altec lansing voice of the theaters (106 db at 1 wat 1 meter) and my 90 watt SAE amplifier (19 db) 106 plus 19 = 125. LOUD. Most speaker amplifier pairs today will not play LOUD.