Material needed for a box

[2000Gator 10+ year member]

how much does a sheet of mdf cost and would it be enough for say a 4cube ported box for 2 12"s just as a guesstimate

 

[PV Audio 5,000+ posts]

http://www.caraudio.com/forum/showthread.php?t=197899

 

[69420potsmoker 10+ year member]

Q for people with sealed box building experience:

Have you tried putting egg carton foam in the enclosure behind the sub? or deadner?

 

[PV Audio 5,000+ posts]

Deadener doesn't do anything for dense wood. Egg crate foam does help to reduce some standing waves and clear up your bass response.

 

[69420potsmoker 10+ year member]

would it decrease or increase are like polyfil? I dont know what the hell polyfill is anyway im just curious

 

[helotaxi 5,000+ posts]

Polyfill is better than foam. The foam in a sub enclosure is rather pointless. The wavelengths involved are so long that standing waves in the enclosure aren't an issue. Home cabinets benefit from the foam because you're usually allowing the woofer to play up into the midrange. Not so with a car sub.

For the OP, I have painted my last two MDF boxes with very good results. Round over the edges. Sand it all smooth, blend the seams, etc... Spray it with high build automotive primer, heavy on the end grain so it fills the end grain with primer and can be sanded smooth. For the first box (pics in my gallery) I sprayed it with SEM texture spray followed by satin black. On my newest box, I sprayed it with Rust O Leum hammer finish black with some trim pieces done in hammered silver. The result was really nice.