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<blockquote data-quote="n2ma" data-source="post: 136085" data-attributes="member: 540614">I have built countless boxes with 2&quot; drywall screws with liquid nails. I started out using wood glue but found that liquid nails ( or sub floor adhesive) works better. The wood glue is great for grained wood. Using MDF does not have many pores for the wood glue to bond to. Also the wood glue is very stiff and cures very hard. With liquid nails it bonds, and seals at the same time. With the intense stress of SPL In a box you want all the bond you can get.&nbsp; Adding some bracing in boxes over 4 cu ft is always a good idea. I always over build each box.As far as using 2&quot; screws You won&#039;t have to worry about cracking the mdf if you counter sink and use a bit (like a #6) to pre drill. Then use a #6 screws. You can make sure by holding the bit next the screw. You should have a bit just small enough to see just the threads of the screw.For really high spl boxes, I have found that using a threaded Rod in the the middle helps keep the flex down with out giving up to much airspace.</blockquote>

[QUOTE="n2ma, post: 136085, member: 540614"] I have built countless boxes with 2" drywall screws with liquid nails. I started out using wood glue but found that liquid nails ( or sub floor adhesive) works better. The wood glue is great for grained wood. Using MDF does not have many pores for the wood glue to bond to. Also the wood glue is very stiff and cures very hard. With liquid nails it bonds, and seals at the same time. With the intense stress of SPL In a box you want all the bond you can get. Adding some bracing in boxes over 4 cu ft is always a good idea. I always over build each box. As far as using 2" screws You won't have to worry about cracking the mdf if you counter sink and use a bit (like a #6) to pre drill. Then use a #6 screws. You can make sure by holding the bit next the screw. You should have a bit just small enough to see just the threads of the screw. For really high spl boxes, I have found that using a threaded Rod in the the middle helps keep the flex down with out giving up to much airspace. [/QUOTE]

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