material so when you install the 15 inch woofer face down, the sound'll bounce off the bottom. Then, design the fiberglass enclosure around that. I had an installer create some blueprints for me of a lightweight system some years ago. I just never put them to use.
"I haven't had the reason or opportunity to be aggressively creative until now... So who's next?" -- Iceman/Uncanny X-Men #300 :