If you are building your own, try a pair of Hartley 24" woofers in custom cabs that you can find designs for all over...
http://www.hartleyloudspeakers.com/new_page_2.htm
file:///C:/Users/Richard/Downloads/hartley%20box%20(1).pdf
You need a big amp (>200 RMS) and a big-boy crossover...
http://www.hartleyloudspeakers.com/new_page_2.htm
file:///C:/Users/Richard/Downloads/hartley%20box%20(1).pdf
You need a big amp (>200 RMS) and a big-boy crossover...