I built a box for my four hds315's and it seems like they should be a lot louder than what they are....the box I built is 43 wide x 25 tall x 31 deep with one 16 inch octoport thats 20 inches long...so it's 16 cu ft tuned to 36Hz with 200 square inches of port. Is the box big enough and is 200 inches of port to much or not enough for all four of them? I'm going to double check how I have them wired
