I have a few questions regarding what could theoretically be a spectacular pair of sonosubs. I would plan on using 2 Dayton 15" Titanic MKIII drivers - can they be mounted facing down? (the stats on these are better than the Adire Tempests) I would probably go with 2 24" sonotubes, 72" high, 1 driver per tube. Unsure of how many and how large of ports to use - my guess would be 3 6" ports, each about 24" long, placed on the top end cap. I'm thinking 3 1" thick layers of MDF sandwiched together for each endcap, 1" overlapping the tub, 2" on the inside, with 3 threaded rods connecting the top and bottom end caps. I would use a Crown K2 to deliver close to 1,000 watts to each driver at 3.5 ohms. I am not familiar with any sub creation software. If anyone sees anything obviously wrong with this configuartion, please let me know. I plan on pursuing something of this nature within the next year. Any help would be greatly appreciated.