I built a box for an RFD2212 HX2 12 D4 two weekends ago. It is 3/4 ply, not particle board 38x15x15 with a slot port 13.5x31x3. I used the RE enclosure calculator and it seems it should be about 2.8 cu ft tuned to 29 hz. I have this powered off of a Crunch PZI1500.1 mono at 2 ohms. I have 1/0 power and ground. My question is that my box seems to crush the lows but higher bass notes sound almost non existant. For now I have the factory mids and tweeters with a high pass set at 90hz and I have the bass boost on the PZI at 0, Subsonic filter set at 25~hz and the low pass set at about 100hz. Specifically when I play songs like Big Tymers Still Fly, the low low notes slam, but the upper bass sounds very quiet and doesn't hit hard at all. Can anyone help me determine if this is a good box for this woofer?