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Do you absolutely need 1" MDF? Just laminate some ¾" and ¼" MDF together. Usually ¾" with bracing is sufficient though, and then double up the mounting face if necessary.

Lowes and Home Depot are not lumber yards, you will have to look for a real lumber yard to find someone that can order 1" MDF.
 

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Im using 25mm mdf for my dual 18 sealed sub. Measures 30" long by 36" high by 22" wide. Box itself weighs 215lb plus 100lb for the drivers. It will weigh a tonne but will be solid as a rock.

I was worried about using 3/4" mdf. Depends on the size of the box I would imagine.

cheers

Graham
 

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I'm useing two sheets of 1/2in baltic birtch for my builds. 14cuft slot ported boxes with 18in mal-x sub being used. With bracing and sub in turns out to just over 10cuft per box and is tuned to 16hz.

1/2in works well because you can use it for braceing also and is easy to notch it for curving or flaring the port inside the box.

Scott
 

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If you look in the yellow pages for commercial lumber & sheet good suppliers you can get 1" MDF w/o a problem, except you may need to be a business to buy from them.
I'm near Philadelphia & get my stuff from CH Brigs, there is Harbor Sales in Baltimore, but they deliver all over the area. Check with a local cabinet shop, they'd have access to it from their suppliers.
Peace
Justin
 
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