Yes, it would be 2 seperate boxes, as a 14 hz tune corresponds with ~700L of displacement with this driver. There is about 1500L of total displacement, which would account for some internal port displacement on each box. The D2 is the driver I purchased as well. I would set up 2 boxes with each driver wired in series, then connected as normal to each individual channel of the amp. The reason for this is that you can better control the level of each sub, especially if they are going to be placed in seperate locations. This will also help to prevent bottoming out in an ebs alignment. Just make sure you switch off the 20/50 hz high pass filter on the ep2500
