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So I got started building my theme project for next Spring's InDIYana. I am using the SB17MFC35-8 poly cone woofer and yet to be determined tweeter. Maybe the Beast Mode, maybe the RS28A. Here is the woofer manufacturer's infinite baffle FR. Looks like a pretty easy driver to work with.
It will be a DCR design using 2" PVC ports. Modeled F3 is 34 Hz and it can take a full 20 Watts all the way down to 28 Hz with an output of 100+ dB.
I'm building it with the 3/4" thick particle board shelving from Menards. That's a lot of wood for <$20!
I'll probably make the rear panel removable so I can experiment with adding/removing damping material from the two chambers.