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I made my box out of 3/4" MDF. It's really strong stuff, I'm running 1200W to 2 12" audiobahn subs and I didn't bother adding any internal cross bracing because I was lazy. Turns out I didn't need it anyways because the box doesn't flex when I crank it up. Of course it probably weighs around 100 lb with the subs in it.
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