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<blockquote data-quote="shizzzon" data-source="post: 6417956" data-attributes="member: 590338">it may not be a wall... i currently have a wall that flexes like crazy in the rear.Small car, not lots of room.It&#039;s single sheet 0.75&quot; mdf in the back.&nbsp; I got a single 3\4&quot; allthread ran from it to the baffle.&nbsp; i got 3 runs of flat steel inside that wall that is bolted through to the other side but it seems like that doesnt help at all...It&#039;s like the steel doesnt flex.. just the whole wall is still moving and the steel is just along for the ride..I need to figure out a way to add additional bracing to this back area before i tear it down next year...I&#039;m thinkin about using some LARGE Steel L brackets and wrappin them around this back wall section.&nbsp; the back part is 29&quot; high so i figured i get 4 12 x 12&quot; steel l brackets bout 1\4&quot; thick and secure them to the outside AND get 4 more for the inside and bolt them together.&nbsp; That should hold lot better than what i got now.I&#039;m doin 153s at the head now and 156s in the kick.Once i decide to tear this down, i want to form a shell from the b pillar back throughout the car made out of mdf.. but i guess BB now and Durock behind it or just 13ply BB and 1&quot; square steel tubing behind the BB to form the shell to make it stiff as hell.that way whatever design i build will be built inside this shell.I got plenty of more power to add to my existing setup anyway before i do another design.I&#039;m runnin 4 dc level4 15s off of only 7,000w right now.I&#039;m gonna try to tweak the design until nothin else works then i&#039;ll drop my amps and go with 24,000w and see if that does it.I&#039;m only 3.5db down from the world record in the division i&#039;ll be runnin in that was set last year in MECA..This is my first year running in MECA so i&#039;ll see how i do.</blockquote>

[QUOTE="shizzzon, post: 6417956, member: 590338"] it may not be a wall... i currently have a wall that flexes like crazy in the rear. Small car, not lots of room. It's single sheet 0.75" mdf in the back. I got a single 3\4" allthread ran from it to the baffle. i got 3 runs of flat steel inside that wall that is bolted through to the other side but it seems like that doesnt help at all... It's like the steel doesnt flex.. just the whole wall is still moving and the steel is just along for the ride.. I need to figure out a way to add additional bracing to this back area before i tear it down next year... I'm thinkin about using some LARGE Steel L brackets and wrappin them around this back wall section. the back part is 29" high so i figured i get 4 12 x 12" steel l brackets bout 1\4" thick and secure them to the outside AND get 4 more for the inside and bolt them together. That should hold lot better than what i got now. I'm doin 153s at the head now and 156s in the kick. Once i decide to tear this down, i want to form a shell from the b pillar back throughout the car made out of mdf.. but i guess BB now and Durock behind it or just 13ply BB and 1" square steel tubing behind the BB to form the shell to make it stiff as hell. that way whatever design i build will be built inside this shell. I got plenty of more power to add to my existing setup anyway before i do another design. I'm runnin 4 dc level4 15s off of only 7,000w right now. I'm gonna try to tweak the design until nothin else works then i'll drop my amps and go with 24,000w and see if that does it. I'm only 3.5db down from the world record in the division i'll be runnin in that was set last year in MECA.. This is my first year running in MECA so i'll see how i do. [/QUOTE]

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