I run a 15" 2226 below my 2360 w/ 2441 and Radian diaphragm. I cross at 500Hz. Sometimes I move the point up to 600Hz. 24db L/R filtering. I also fitted another set I had, 2445w/ original diaphragm. And also cross at 500-600Hz. But when I switch to an 18" 2240, I may have to cross at 400-500 Hz as I don't think the 2240 can play nice and clean up to 500Hz.