I was all set on getting an Accugroove Tri-210L and Whappo Grande, when I had an interesting idea. While I'll probably still get the Tri, I might make my own subwoofer and eventually my own cabs for various other purposes. From what I've heard, it's relatively easy to do this if you know the Thiele small parameters and know the various necessary calculations. What I'm wondering is, aside from the obvious saws, hammers and such, what equipment would I need? What calculations are necessary? I'm fairly decent at physics, so if I could find a site that explained the calculations and such, I could probably make a go of it. I'm not very good at woodworking, but I might sign up for that class next year. My real problem is that I need a relatively loud and deep subwoofer that's easier to transport than the Grande. I'd really like to get the Grande, but it's just a bit too big.