Hi chesseroo, prem, guys,
Subwoofer design is really interesting, but there's no free lunch. As a designer, there are ALWAYS trade-offs. So, if you want ultra-deep bass extension, to 22 Hz, you trade off sensitivity (efficiency), and if you want to achieve that in a tiny 9-inches-square box (a la Sunfire) with a very small driver, then you have to design a driver with a huge cone excursion(the linear back and forth movement). Then you must add a giant magnet/voice-coil "motor" assembly to drive the cone, and use an enormous amplifier to power the thing, because you have to pump a lot of air (to get 22-Hz extension) with a small cone.
You also give up maximum SPL, so the little Sunfire, although it's not "flat" to 22 Hz, it does indeed produce remarkable extension to that frequency and, in a modest room, will get the draperies flapping, as it did in the demo I saw in a Las Vegas hotel room at a CES show. And, of course, it's expensive, because of the necessary large amp and the custom-engineered driver. But if you don't need to fill a large room with high-volume ultra-deep bass, and you want something you can hide behind the draperies, then the Sunfire will do it.
Regards,
