Originally Posted by rlj5242 /forum/post/15505330
We don't care about labels. One of our favorite driver suppliers is Fi Car Audio.
That's your problem. What is the Fb (box tuning frequency) of your enclosure? With a 1.2cf box, I bet it is 30hz or higher.
In the home theater world, 99.9% of the time you run out of excursion before reaching the thermal limits of the driver. In other words, ignore the RMS rating on your driver. If you gave it 1500w in that box while watching an action movie you would destroy it.
DIY sub building isn't magic, it's just physics. Learn the basics of the Theile/Small parameters and how to use a modeling program. Finally, read up on the differences between sealed and ported enclosures. Finally, read about the advantages of a large enclosure as explained in Hoffman's Iron Law.