[Edit: In my original post I was a little over-exuberant about my performance gains by stuffing my sub. I just wanted to edit this to say that despite my gains that each situation is different and you should take into account your room size, box design, driver specs and performance goals to see if stuffing will improve your performance like it did mine.] After reading Ron-P's thread on the difference adequate stuffing makes, I tried stuffing my sealed sub properly this weekend. What I thought were giant room induced humps have almost been completely tamed. I built a 1.75^3 ft. sealed enclosure for a DVC 12" driver with a 250 PE amp powering it. I built the enclosure a little larger than some folks had because I was not interested in getting any sort of bumps in the response (didn't want a Q greater than .7). So I built it a little larger and lined the walls with egg crate foam thinking that would be enough stuffing with such a (relatively for the DVC) large enclosure. But when I tested it using AVIA sweeps I had a huge hump in the response between 45 and 55 HZ. This made it very hard to calibrate and it did not sound so great. All bass in the 60-80 and 30-40 region was essentially not heard because if I calibrated based on the levels in those regions, any sounds in the hump were overpowering and so the sub level was always too low in some regions and too loud in others. But I wrote it off to "room induced humps" that I'd read about. Well, I read Ron-P's thread and decided to really stuff the crap out of it and see what happened. Holy hell, does this thing rock. Hump is almost all gone (I may stuff it even more). I now have it calibrated properly and my music and movies sound "right" again. By the way, you guys with Tempests seriously need to check your hearing and wear ear plugs or you're going to go deaf because the amount of clean bass that this little sealed 12" DVC can put out with the amp gain set 2/3's of the way up is rattling my hole dang townhome. Please be careful. I have tinnitus and when I think of what a ported Tempest might be doing to yall's hearing it makes me worried. So the lesson I learned and want to pass on, especially if you're like me and are following the suggested designs of others, is that if those designs contemplate stuffing, don't skip that part. Thanks Ron-P for posting!