Here some picture of the JBL B380 Clones I recently finished. It was based on information contained in the 1983 “New Lows in Home-Built Subwoofers” article.
URL: http://www.lansingheritage.org/html/.../1983-subs.htm
I was using the B380 build as a test run (carpentry and finishing techniques) for building a 4344 so some of the things I did may seem overboard for a subwoofer box.
I used ¾ MDF for all the panels with a Baltic birch bracing 3 x 1.25 inches.
Speakers are 2235s newly re-coned which when you add up the cost of acquiring and re-coning sure makes for a pricy pair of speakers. And add two more for the 4344s…nothing cheap about this vintage stuff at all.