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View Full Version : Does only the front baffle need to be double layered?



RSDXzec
05-19-2013, 01:10 AM
Looking at building a box for an XFL 15. The thickest MDF I can get cut at the shop is 1/2". I'd like to know if I can get away with having most of the box single layer and just double layer the baffle or if it's 100% necessary to put double layer all the way around.

Currently looking at 4 cubes tuned to 32hz with 64 sq inches of port.

Cheers.

mylows10
05-19-2013, 01:38 AM
you need 3/4 inch mdf

RSDXzec
05-19-2013, 01:45 AM
you need 3/4 inch mdf

can't get that at a decent size anywhere

best I could get is a 16mm sheet but at like 2400x1200mm and I can't fit that in my car.
hence the need to go with 1/2" because they can actually cut it at the shop for me.

Slo_Ride
05-19-2013, 01:55 AM
i'd like to know if i can get away with having most of the box single layer and just double layer the baffle

cheers.

no

SounDrive
05-19-2013, 02:00 AM
can't get that at a decent size anywhere

best I could get is a 16mm sheet but at like 2400x1200mm and I can't fit that in my car.
hence the need to go with 1/2" because they can actually cut it at the shop for me.

I don't know what's available in Australia, but you may have to go with 3/4 baltic birch or arauco (although I really doubt arauco is available there)

16mm would be the same as 11/16, which is what cheap prefab boxes use... or you could double layer the 1/2 inch all around.

RSDXzec
05-19-2013, 02:08 AM
I don't know what's available in Australia, but you may have to go with 3/4 baltic birch or arauco (although I really doubt arauco is available there)

16mm would be the same as 11/16, which is what cheap prefab boxes use... or you could double layer the 1/2 inch all around.

I know I can get birch but not at 3/4... I guess double 1/2 all around is what I'll have to do...

SounDrive
05-19-2013, 02:11 AM
I know I can get birch but not at 3/4... I guess double 1/2 all around is what I'll have to do...

Is there anything you can get at 3/4? And if the birch is 16mm (11/16) it would probably be fine

RSDXzec
05-19-2013, 02:28 AM
Is there anything you can get at 3/4? And if the birch is 16mm (11/16) it would probably be fine

just went to the store to have a look.
The thickest I can get cut there is 12mm
What I have available is:
MDF in 12mm and 16mm
Birch in 12/15/17/19/21mm
The birch costs about double the price of the MDF and all those come in 2400x1200 (almost 4ft by 8ft) sheet so I have no idea how I'd get anything in my car.

SounDrive
05-19-2013, 02:28 PM
just went to the store to have a look.
The thickest I can get cut there is 12mm
What I have available is:
MDF in 12mm and 16mm
Birch in 12/15/17/19/21mm
The birch costs about double the price of the MDF and all those come in 2400x1200 (almost 4ft by 8ft) sheet so I have no idea how I'd get anything in my car.

19mm birch is equivalent to 3/4 inch.. Personally I would go with that, but the thicker MDF would probably get the job done just fine as well.

Milk Mayne
05-19-2013, 03:04 PM
Most lumber yards and stores that sell wood should be willing to cut that sheet down for you. Since I've gotten rid of my truck I've had to do the same thing. Just figure out what sized pieces are manageable (to get in your car) and useable (to build your box), and ask for the sheet to be cut accordingly. Use the 19mm birch like T 2 said, and I'd also pick up a 1" (25.4mm) dowel rod to use for any internal bracing.

Serpent710
05-19-2013, 03:33 PM
rent a truck for a hour shouldn't be more than 15-20 bucks. used to work at uhaul and you could rent for 20 bucks for the day and just replace the fuel u use. Id rather spend that 20 bucks and have a nice box than one i have to worry about.

RSDXzec
05-19-2013, 06:23 PM
19mm birch is equivalent to 3/4 inch.. Personally I would go with that, but the thicker MDF would probably get the job done just fine as well.

sweet 19mm birch all around it is


Most lumber yards and stores that sell wood should be willing to cut that sheet down for you. Since I've gotten rid of my truck I've had to do the same thing. Just figure out what sized pieces are manageable (to get in your car) and useable (to build your box), and ask for the sheet to be cut accordingly. Use the 19mm birch like T 2 said, and I'd also pick up a 1" (25.4mm) dowel rod to use for any internal bracing.

only up to 12mm thick though according to regulations or some ****... got them to cut 16mm once but every time i ask them now they say their limit is 12mm.


rent a truck for a hour shouldn't be more than 15-20 bucks. used to work at uhaul and you could rent for 20 bucks for the day and just replace the fuel u use. Id rather spend that 20 bucks and have a nice box than one i have to worry about.

Found a mate who says he's got a trailer I can borrow when I need to get the wood so that's pretty much sorted.

Cheers.

nvturbo
05-24-2013, 07:30 PM
For my previous box, I settled for the pre-cut pieces of 3/4" MDF. It was about $7 more than a full sheet (4'x8'). The store employee mentioned their vertical table saw wasn't accurate if I wanted to have them cut. I really believe he was being lazy and didn't want to cut it.

hispls
05-24-2013, 07:58 PM
I would do half inch mdf double layer all around tripple on baffle.

pro-rabbit
05-24-2013, 08:32 PM
I would do half inch mdf double layer all around tripple on baffle.

And if this is the choice you make, be sure to glue very well. Use a generous amount and spread it out before you put the sheets together.

I would also be sure to use some bracing as well.

tommydh
05-24-2013, 08:37 PM
If you do go the double up route Id glue thee layers together and set over night with weights on them. This way when you work with them it will be like using single piece.