I need cabinet help. I have a Aura Sound 12 driver. Part number 86-027-08. I googled the number and found http://www.talkbass.com/forum/f15/ampegs-pb-series-cabs-132512/ Hinting that the driver might be from a Ampeg Portabass PB112, I looked up specs on the cabinet and found the dimensions 17x17x12. Assuming 3/4 material, this is a 1.72 ft^3 cab. Looking at the PB112 pictures, it looks sealed. Anyone know? Can I just make a sealed back cabinet with the internal volume 1.72 and enjoy? How much volume should I add for the driver? Add some kind of batting? Add a port? What size port? I thought I might find wisdom reading this thread but I struggled getting through it all. I have a wood shop so cutting/bracing/assembling is not a problem. Thanks for any help.