sunfire woofers were designed by tc sounds... and up until about 3-4 years ago, a majority of the expensive ones were made in san diego too.
background: when bob got started with his company, he asked people what could not be done... one common answer was a small subwoofer that puts out good bass. He said, ok i'm gonna do just that and that's pretty much how sunfire got started. He commissioned thilo to design a much higher excursion woofer than was previously available, mind you this was some ~15-20 years ago. He then designed an amplifier that was small and put out a lot of power. He put them into a small box with a passive radiator and the sunfire was born. For the time, it was pretty incredible because it made as much bass as subwoofer systems many times larger.