Heard one last night at a friend's gig. He just built the cab this week, and as I suggested he made the ports a little taller, using 1 X 3 stock for the port runners instead of 1 X 2. Just enough to reduce the net internal cab volume a little and to accommodate higher power levels at the lower frequencies. Sounded absolutely stellar for the old school jazzy blues thing his band is doing. Should work well for PA too.