Have a JL12w6v2 in a sealed 1.25cf with a jbl 600.1 amp. What to make a ported box for a change to see the difference, from what i herd i think i will like it better. On the JL sight they have a suggestion for a box but it has a 1.5cf slot port design and does not say what it is tuned to. Is this a good idea to try this because it is to JL specs, or should i just make my own ported box with a round port design??