I'm willing to bet that with the "Twins" set up with one woofet each - I can filla room of 500-600 easily. Add more woofers for even more umph. I have a stereo subwoofer that can be fed from the line outs of the Towers to provide additional bass if the need arises, but I doubt that it will.

You have to remember the way this system progects ..... it's so full and even - the covereage is much better than a conventional cabinet that sounds too loud at close distance from it.