I was wondering if some of the experienced Sonosub builders wouldn't mind double checking my calculations. 24" Diameter Tube 26" Internal Height 15" Adire Audio Tempest Subwoofer 22" long and 4" wide Precision Flared Port (from end to end) Samson S700 Amplifier with one voice coil to each channel running in Parallel. 16-17 Hz tuning frequency as the goal. Other odds and ends info: 3 layers of 3/4" MDF on top endcap with 2 layers internal. 2 layers of 3/4" MDF and 1 layer of 3/4 plywood on bottom endcap. Tube will be lined with 1/2-1" of pollyfill around the sides (should the bottom of the top endcap be lined as well?) Please let me know if the numbers add up correctly! Chris P.S. I am waiting for the terminal cup as it was accidentally left out of the shipment when my Tempest was sent. I feel like a crack addict with everything but the lighter!!!!!!!!!!