I think Jim Griffin is right about the drivers. In my biased opinion I think you can do better than cloning these. The longer planar / ribbon drivers will allow a lower crossover point and thus larger woofers. That way you can run them full-range or have a lower crossover point for optimal subwoofer integration. There are many 5-7" woofers which will give you a sealed box -3db point of 60-80hz. Plus you can move more air, one of the big advantages of a line array.