Currently right now I have a box with no bracing, its not even double layered. I have two RF T1 15s in a 5.6 cube box power by a RF T10001bd. I am hitting a 146 on the dash legal. My current box size is 16 tall 38 wide 20.75 deep. This setup is in a trunk, so space is an issue. So, to my question: would I get a gain by bracing the new box I plan on building? Okay, before you start yelling at the computer screen... I am asking because of the amount of power that I am running. For example: someone running 20,000 watts would need an ass of bracing vs me running 1500 watts. As I said before, space is an big issue for me, so I don't want to take up to much box volume with bracing that I don't need. The new box i plan on building will have a double face and I was going to do a threaded rod cross brace in the center. Is this enough for me? Do you think I need more? If so, tell me why and what kind of bracing. Also, if there is anyone who testing their setup before and after bracing, what was the result? BTW, new box size is going to be 16 to 16.75 by 21 to 23 by 38. Subs are pointed up ports forward, sub side will be doubled.