Hello everyone. I am planing on building a custom 2-12 bass cab. I am an experienced cabinet maker, so I not worried there. I just need to figure out what volume (cubic feet) and port dimensions I will need to make it for best (or close to best) performance. The drivers I am using are these: http://www.tubesandmore.com/products/P-A-S12K3-8 I have tried using a couple different free cab calculator programs, but they are giving me a cab volume of about 50 cubic feet, and port lengths of 1000 feet That can't be right...right? Could somebody with a little more brains help me out? I though I just had to "tune" the cab to the free air resonance of the drivers. That should be a piece of cake, but again, I have managed to confuse myself. Any help is greatly appreciated.