custom box help

[Jerm1400]

I built a box for two American Bass TNT 12's tuned to 33hz @ 4 cubic feet with .75 MDF. I have them on a little pioneer gm d8604.They probably are getting about 300 each. When I turn it up full tilt the box flexes at the top towards the center and I hear noise inside the box. I braced the box with 1.5 inch wood front to back & top to bottom. Can some tell me what's going on? I

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[Jerm1400]

Can you see it now?

 

[Jerm1400]

 

[iLL Ridge 10+ year member]

Box dont look half bad. Not sure why you're flexing.

How does the top panel of mdf fit?? Is it tight and even?

 

[Jerm1400]

Box dont look half bad. Not sure why you're flexing.How does the top panel of mdf fit?? Is it tight and even?

Thanks //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif my first time. And it's tight but slightly uneven I cut the wood with a skill saw. But I'm confused //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif because it only flexes where the bracing is

 

[Jerm1400]

 

[snyderd758 10+ year member]

Box actually does look pretty good especially for first time. I would maybe remove the wood bracing and buy some 1/2 inch all thread washers and nuts and use that for bracing instead. Run 2 top to bottom behind the subs and one width wise maybe even buy some 1 inch flat bar and tie it into the all thread that runs top to bottom to help with the flexing. One other pointer I would either carpet or paint the enclosure most woods are porous and this would help seal it.

 

[snyderd758 10+ year member]

You need to run some kind of weather stripping or gasket between the subs and the enclosure to that is we're most leaks occur. Part express sells some that works very well.

 

[Jerm1400]

Box actually does look pretty good especially for first time. I would maybe remove the wood bracing and buy some 1/2 inch all thread washers and nuts and use that for bracing instead. Run 2 top to bottom behind the subs and one width wise maybe even buy some 1 inch flat bar and tie it into the all thread that runs top to bottom to help with the flexing. One other pointer I would either carpet or paint the enclosure most woods are porous and this would help seal it.

Thanks. I have no air leaks I checked already it just flexes at the top where the middle brace is i'm going to try adding more bracing & see if that helps and which clue would be best to put carpet on the box?