Below is a link to a better discription of the sub,
http://986forum.com/forums/showthread.php?t=11207&page=2&pp=20&highlight=subwoofer
They are not cheap, 500.00, and from what I understand, only about a hundred of that is the cost of the driver. But they sure got the volume and fit down with the sub. Its interesting what a good sub does to the sound of a system.
Ed