Here are some helpful links you may enjoy.

 

If you have found some links yourself pertaining to DIY speaker building, email them to me. 

 

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This is the Midwest Audio Club website page of someone who measured and made slight modifications to the DIY 3.1 Very good article.

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This is a series of how to articles by Jared Kirby who also has a great site -  Kirby Meets Audio  for those interested in kit speakers.

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Great website for anybody that wants to learn more about DIY audio