VMPS Larger sub. 12 inch and 15 inch active and 15 inch passive (downward firing, slot-loaded). 115 db at 20 Hz. You can get them in kit form and they are very easy to assemble. I have a 500W amp I got from Parts express to drive the,. I hat to put rubber feet on all the pictures and paintings to stop them from vibrating and walking...
The sub is $579 including shipping and the amp is $298. Coupled with my Infinity Kappa 6 speakers and my Kappa center, the house rocks. I have MB Quart balcony speakers.