The enclosure is about 3.7 cubic ft, with two Genz Benz 10pr300s from Avatar. It's sealed now, and Winisd says it should have pretty poor output below 100hz, which gels with what it actually sounds like. I thought it would be fun to try to put ports in, so I modeled it with 2 ports and it says they should each be 4x4 to get 52hz tuning. I ordered two 4x4 ports, and they're huge! Could that be correct? Before I cut out the holes, I thought I'd check.