I have been into car audio for almost 15 years, you know just listening and getting the loud spl but not really ever studying it. What exactly does the length and size of a port do. I had the guys at TeamToxicBass design me a box and he told me to use 2 3"X15" ports. I am going to do it because he said to but what is the real reason I am doing this? Can anybody really give me a good reason why?