I recently aquired an IDmax12 v.4 and it is not performing like anyone on here describes. I need some real world personal experience with this driver. It is in a 1.7 cuft sealed box packed with blackhole stuff and being fed 600 watts at 2 ohms from a JL XD1000/5. All gains set correctly. All eq's flat. No bass boost. Sub bottoms out at 30 out of 35 on my head unit. Is the enclosure "shape" relevant to its performance? Currently the box is a somewhat shallow rectangle in order to achieve needed volume, look flush with back seats of suv, and conserve as much cargo space as possible.