What are you trying to do Duck?
The biggest speakers you can fit in a K1100LT are 4". Those don't provide a whole lot of bass.
A buddy of mine, way back in his "I'm gonna build the fastest Camaro on the planet." days, had something installed under his seats called Bass Shakers that you mount under the seats to deliver bass through the seat. Kind of the grandpappy of subwoofers. He had them hanging around in his garage and gave them to me. I'm toying with the idea of taking the subwoofer output of my head unit, running it through a small amp and installing a Bass Shaker on the seat under the rider on my K1100LT.
(http://salestores.com/stores/images/images_747/AST1B4.jpg)