thanks for your comments chris! i love it loud at home, but no, not that loud! this is for small mobile disco use, for 200 - 500 people, occasionally more, generally indoors. i was hoping to use 4 of these or other 15" subs, the trouble is the cabs need to fit in my old audi 80, so size is an issue. and yes i hope to use wayne's programs, but i need to work out how to convert metric to imperial values