Sundown was about 20 years late with their surround design, those have came and went as has most of the products on the car audio market. 20 Years ago there wasn't much if anything in regards to a frame or motor that can utilize the excursion provided by such a large surround geometry. I never claimed to invent the big surround. But we have tooled our own version, paired it with a frame that can handle what the surround allows (as well as a spider that can as well), and attached it to motors that can also drive the cone to high excursion levels. The surround geometry is also designed with even higher excursion linear motors that we have coming down the line in mind. Klippel testing of the units so far show a very linear CMS curve and real-world in-car testing has shown excellent LF output; which is what customers want.