Application dependant. That particular box I built, I GUARANTEE you I will be able to detect a buzz from panel vibrations on the enclosure itself. However, I don't car about that enclosure, hence no bracing. This was the reason I wanted the 1" on that enclosure you built for me Kent. With the plexi front and mirrors, I did not want any braces to take away from the experience, therefore, the thicker material was necessary IMO. To the SPL guys, it may be of no use, but to others with a discerning ear, they will go to the extreme to prevent noise and increase efficiency.