I listen to a lot of rap music and i love the huge bass hits that will shake the car. I have 2 12" 1000w pioneer subs. The sheet to the subs was thrown out by mistake. They were in a dual sealed box that i bought. It was made of 5/8 mdf. My subs blew the center divider out and then cracked the top of the box. Needless to say i need a new box. I dont have a lot of money so im going to build it myself. The only problem is i have no idea on dimensions/vent. I have 15 inches in height from the bottom of the trunk to the bottom of the speakers on my rear shelf. I also have 34 inches in width. I dont want the depth of the box to exceed 15 inches. How large shoud the vent be or should i vent it?