I'm building a 90 liter sealed subwoofer. I'm using 3/4" MDF. Is internal bracing imprtant ? If so, what is the easiest way of doing it? I've seen too many designs, what is the best bracing design ? Another question, My sub's height will be 22", where is the best place to mount the driver, closest to the floor ? or should it be at the top ? a friend of mine told me that the driver should be placed as far from the floor as possible since too close to the floor can create a more boomy bass which will rebound too much from the floor, on the other hand he told me that I will get less SPL's if choosing to mount at the top, is he right ? what should I do ?