Jerm1400
Senior VIP Member
I built a box for two American Bass TNT 12's tuned to 33hz @ 4 cubic feet with .75 MDF. I have them on a little pioneer gm d8604.They probably are getting about 300 each. When I turn it up full tilt the box flexes at the top towards the center and I hear noise inside the box. I braced the box with 1.5 inch wood front to back & top to bottom. Can some tell me what's going on? I