New here and proud new owner of the very sub at question , I recently purchased this sub from Ls1pimp. Initially after reading this very long thread I became worried if I had made the right decision of purchasing this RL-p, after receiving the sub yesterday I was very impressed by the heft and build quality of my new sub and wondered if it sounded as good as it looked, well my concern soon turned to excitement when I loaded it into my new prefabbed but nicely built 1.8 cu in slot ported box , this thing sounds incredible, out put and sq are both perfect , considering that it is only getting 400 watts from a MTX 801d. My previous sub setup was 2 Diamond audio 10 in cm3d4s 1.0 cu in each sealed enclosure and the difference is considerable, the RL-p outperforms in both spl and sq .