Thanks Joe X, I was hoping you would chime in and give your word of advice. you design a very good and pleasing to the eye box, Which is also important. The Hifonic amp is just to get the build up and running. I plan to upgrade to a higher end amp in the future, I didn't know the XFL would handle more than the recommended 1K rms. In the future would this box be able to handle 3.5k? Would I need bracing? and or resin inside the box. I've been out of the loop way to long and all information is great. Again Joe X thanks for the box design , which I'm surly going to give it a try.