Thanks, I also found this a little extreme but can appreciate the passion to eck out that last little bit of a bass note. Scroll down to see the instalation of a horn driven woofer. http://www.galibierdesign.com/systems_kevin_brooks.html
Giant subwoofer
I remember seeing a few years ago on the internet someone who designed their house foundation to be a giant subwoofer. I am trying to find this site again to show some friends the options of taking audio to extremes, (yes, happy extremes). Any other ideas would also be appreciated. Thanks, David.