In my interest to continue to learn, I took two Dayton 12" series II drivers and made an isobaric enclosure. I finally put the drivers in this morning and took some measurements. I was hoping for more low end so either the drivers are wrong for subwoofer duty or the enclosure is undersized or ?? Interestingly the measurements do match the included measurements for the driver..... I will include the driver specs PDF and the measurements. I am getting to my questions in the next thread.