I have an old 2x15" cabinet with which I've been experimenting. I first blocked and sealed the original shelf ports. Then I added a couple round ports to each compartment to tune each to approximately 42 Hz to match the Fs of the drivers I had on hand. Each compartment in the cab is 3.09 cubic feet, and I used 2.95 cubic feet (allowing for the speaker frame) as the volume to calculate the port length. I think the cabinet sounds as good as it's going to sound with the drivers I have. The lacking component in the performance is low end. I like the old cabinet for its retro look and the "one cabinet" rig, so I'd like to improve it and put it to use. The drivers I had on hand (EV 15B) have a relatively small XMax (3.1mm is what I find on the web). My question(s): is there a driver known to perform well in a a small volume, OR, what T/S parameter(s) indicate a driver will perform well in a small volume? I can change port lengths to re-tune the cabinet or seal it up, either one, I'm just looking for recommendations for a good 15" driver to use in a 3.0 cu. ft. volume enclosure.