This past month I made my own fiber glass enclosure for 4 alpine spr-m700 7" coaxial speakers. I have them powered by a rockford amp pushing about 90 watts to each speaker. I just hooked it up today and all I can say is WOW. I could imagine the loudness these $2k wetsounds tower setups are putting out. Just my 4 alpines get plenty loud to hear from wakeboarding 75 feet back.
I am beginning to think that some people are just going by the advertisements when buying tower speakers because at $180 retail for a pair, these definitely are all that most people need. I couldn't imagine how loud Rev10's get.