making a sub box

[ade]

http://www.termpro.com/articles/buildbox.html

http://www.diysubwoofers.org/

http://www.lalena.com/audio/faq/build/

useful for calculating the demensions and sound quality -

http://www.ajdesigner.com/speaker/index.php

http://www.mfr-eng.com/toolbox.htm
(this one shows you dimensions etc)

these may also help

http://www.ehow.com/how_4073_build-subwoofer-box.html

http://ezinearticles.com/?Building-the-Best-Subwoofer-Speaker-Box-Enclosure-For-Your-Car-or-SUV&id=140826

http://www.caraudiomag.com/competition_corner/0301cae_january_2003_sub_construction/

http://www.f150online.com/forums/showthread.php?t=248517

Useful one to know the terms used too -

http://www.the12volt.com/caraudio/boxes4.asp