got a brand new IDQ from a guy off craigslist put it in a box that was 1.25 cubes with some 2x4's taking it down to .9-1 cubic foot. i checked all day for leaks im sure its its 100% sealed. it sound great at low to medium volumes but as soon as i crank it any i get and slapping/rattling noise coming directly from the sub. amp is a alpine mrp-m500 with digital controls. gain is at 0db and output level is -10db. i have been having problems with the amp shutting off at high volumes with the IDQ. Not sure what the problem is with that. i was pushing 2 re sr10's at full power without a problem a few days ago. wiring is dual 2/0 welding wire and 2 ground points 2ft of 2/0 to the chassie and a 4 guage run to - side of the batt. voltage reads 13.9-14 when truck is running. IDQ is dual 4 ohm wired in parallel to 2 ohm. i have speaker wire from VC 1 to VC 2 ++ / -- and then wired to the box from 1 VC +/- .
I pushed down on the cone outside the box and i feel it barely tap something unless i push slow absolutely directly in the center of the sub.
IDEAS? sub is fuked? amp is fuked?