Here's some interesting info about the Model 2. The interior volume NOT including interference from the speakers or the port tube is 1.94 Ft^3. The port is 2.875" I.D. and 3.5" in length. Looks like the tuning of the box is ~41.4 Hz before putting the drivers inside it. This info could be useful if you were looking for other drivers to stick in that box. Methinks the stock ones are a little anemic. FYI!