Me nethier this is what I got out of winisd. All ported boxes are 4 ft^3 Light blue tuned @ 12hz, Green tuned @ 18hz, Red tuned @ 26hz, and for giggles Dark blue is sealed @ 2 ft^3. Me personaly I liked the line @ 18 hz. The sealed box started droping off at 44hz. I noticed that the larger the ported box the more it peaked at the tuning freq (to a certain point). Also do I need alot of port area tuned low, it seemed the more port area I had the longer the port needed to be, but with a smaller diam port it didnt need to be so long But I had a small amount of port area. M5 am i on the right track am i missing somthing??