Ive got a new box design, well at least bracing design. After reading many threads and asking a bunch of questions, I found my bracing to be lacking. Im sure most here know but for those following along that are new to DIY (like me) i'll explain as best I can.
^^^ This is the style of bracing I was going to use, and the bracing I have seen in many builds. What i found out, is that the main reason you even use bracing is to eliminate panel vibrations and to tame the box ballooning. I know this isnt the proper term but picture the box trying to balloon out when the driver is on the IN stroke, and the box trying to suck in on the OUT stroke. The center of the panel is going to be affected by this ballooning the most, and this is where you want the most/strongest bracing. As you can see in the above picture, where the center of the panel would be, is also where the bracing has the least amount of material and is the weakest. The best way to brace is to try and have the two opposing panels be connected in the center, or as close to the center as possible. This includes connecting the front and rear baffles.
^^^ This bracing to me seems to be the most effective. As you can see there is a direct connection between the front baffle and the rear baffle. It may not be at a perfect 45 degree angle but I think it will be fine since there is two braces each direction. Also you can see in the center of panel there is a solid piece of material connecting each side. This will greatly help the "ballooning" effect. Yes I know there is bracing in the corners, and the corners are the strongest part of the box, but I see no harm in leaving it there. If anything its adding weight to the box.
You can see I have some 4" holes in the bracing towards the center of the box. My thought on doing this is because of the pole vent, and having it fire into a small square in the back of the box. Now it will share the air of the chambers next to it. Maybe its not needed but it made sense to me. I have not redone the volume calcs yet, but plan too.
One step closer to starting this thing! Im pretty confident this will be a solid box.