im building a box for my SX15 that should be arriving in a day or two...i had someone help me with the box design and i cut all the pieces out that i needed...but someone was saying that my first box design would only have 35 square inches for the ported slot....so i made another design which would give me around 67 square inches....then someone said that my tuning would be too high. the links below will show you my box designs i made....tell me if i should use the first one, the second one, or make a few changes to either of them...im trying to tune it to between 28-36hz...