How do you tune a box? Is the size of the port the way you tune it? I have a box premade that is 3.5cb/in for each chamber. I am ready to make the port and then drop it in there. My uncles got all the wood workin tools to cut the square out. I've got 2 HE2's and the box is 3.5 for each. How big of a port should i make for each chamber and it set around 35 Hz? thanks