This is a guide on how to build a DIY subwoofer to complement your home cinema / stereo system. With a bit of time and effort, you can build some awesome stuff!
DIY Subwoofer :)
The V.B.S.S. DIY subwoofer design thread - AVS Forum | Home Theater Discussions And Reviews
Various subwoofer designs
DIY subwoofer and midbass modules with TC Sounds LMS Ultra 5400 and JBL 2226
Stereo Integrity 18" Subwoofer Towers. Wall of power.
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HiVi SP10 DIY Subwoofer Enclosure Drawing