I have a an old subwoofer I that I use to have in my car and I have and old pioneer elite pro logic receiver. I am thinking of taking the sub out of it's cabinet and attatching it to the in side of my riser hoping that it will rattle and vibrate the riser on loud bass heavy scenes during movie watching. What I am asking has anyone in the forum done anything similar or if you guys think that it will work. Also I built two large entertainment cabinets that about 71 inches tall, 21 1/2 inches wide, and 24 inches deep. I built into a wall of my theater but only ended up using one of them. I've been thinking about turning the unused one into an enclosure and putting either two or three 12 inch or 15 inch subwoofer. I know there is more involved than just slapping the subs in their, I just want opinion on whether this sound feasable or not.