alphasonik PMA1200DA and two PSW812 i

I see you don't english speak very,  umm, , Yes most box's are made out of MDF medium density fiberboard, usually 3/4" or thicker.   There's not much to it, just measure out a rectangular area in your trunk, as much as you are willing to give up for the box, then draw out some 3D plans the best you can so you can visualize it better.  Once you get all the dimensions you can click on the Volume Calculator on your left of the screen and find out the air volume the box will have, and try to match the air volume to what Alphasonic reccomends for there subs.  you will want to devide the box in the center when your building it so the air space is not shared, its separated.

Ask questions as you go, and we will try to answer them.

By the way, welcome to the board!

hello mr.

i have a pair alphasonik 812 of 2 ohms dual coil, i have space 35``x 13`` x13`` i dont have specs for subs alphasonik, however I need to make the box for this subs, Please helpe me. Where can I find the specs for this kind of Subs.?  I have mdf 3/4. and I had look into the alphasonik website but I didn't find anything about it.

Txs a lot

http://www.carreview.com/usercontrols/crproduct/productspecs.aspx?productid=324232

Thats all i could find?

From what I read these subs are not designed to be put into a sealed enclosuer.  Try downloading blaupunkt box building program and plugging in the specs of your sub.  This should help you to find the approx air space needed for these subs.

Sorry that we can't help but I know that as people find out more info. they will help you out....