Guided by my selection of the Dayton PA130-8, I knew that I wanted to use two drivers per channel in a ported alignment. Based on my desired overall cabinet size and the enclosure space that would need to be devoted to the electronics, I had about .30 cu. ft. of available space per driver pair. This works out to be a very nice volume, and the pair can achieve a respectable F3 of approximately 80 Hz in this enclosure. To accomplish the bass tuning, I installed a 1-1/2" flared port tube that was cut to 2-1/2" long for a tuning of 75 Hz.