Re: Enclosure size too big for today's speaker requirements
You should be just fine with most 12s (the Type R will before well in it)... The box sizes havent changed much...
As for making it smaller, add some bracing to the inside. Fill doesnt change the volume much, but is used to make the sub think the box is bigger than it is.
Deck: Pioneer 80PRS
Front Stage: Incriminator Audio I65C / Front Amp: Alpine MRV F540
Sub: 12" Sundown ZV3 / Sub Amp: MMATS 2000.1
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