im looking for someone to help me out on deminsions of a box for my 2 new alpine Type E 12's here are all the specs i see
Max H,W,D - 20",34",20" VAS - 61L Sens - 89Db FS - 31Hz Qms/Qes/Qts - 9.68/0.70/0.66 Xmax/Xpeak - 11.7mm/23.4mm mag weight - 64oz Disp Front Mount - 0.086ft^3 Disp Rear Mount - 0.092 ft^3 Added Volume reverse mount - 0.084 ft^3 Recomended Sealed Box Volume - 0.8-1.7 ft^3
hopefully this is more then enough info if you need anything else lemme know ill post it i really want a vented box if at all possible and it will probably have a devider in the middle so lemme know if this is possible thanks Doug
What you need to do is make sure that each woofer has it's own private sealed enclosure (use a divider) and each side should be between 0.8'^3 and 1.7'^3 (add about .05 per side to compensate for the displacement of the speaker itself.)
I typically decide on two 'set' dimensions for the box (the width and height) and then adjust the depth to make the volume right. If you are using 3/4" MDF or particle board, here's the specs to make a 1.5'^3 box:
1.5 cubic feet = (1728 x 1.5 = 2592 cubic inches)
Set: 34" wide OD (2 chambers each 15.88" wide ID) 20" tall OD (each chamber is 18.5" tall ID) 10.33" wide OD (depth inside is 8.83") **15.88 x 18.5 x 8.83 = 2594.08 = 1.51'^3**
Of course, you want as much depth behind the driver as possible so you might want to make it a little shorter and a little deeper.
Just remember that there are 1728 cubic inches in a cubic foot and you are only concerned with inside dimensions for the speaker. The more air tight your box is, the better it sounds (this is a big difference between crappy, flat-sounding bass and a crisp slammin' bass)