Hello!!!!!!!!!!! My name is Don, I'm 17 and have become deeply involved in sound reiforcement. I Have 3 JBL E-140's and a Single JBL E-130 that I would like to make low frequency cabinet. I'm planning to make a box that is 6 cubic feet and tuned to 40 Hz. They will be loaded with Two 15's per box. Now the problem is that there is going to be an enclosure with two different drivers (JBL E130/E140). The JBL E130 has a higher fs and has a small XMax. What should i do about having these two different drivers in the same box?????