both boxes seem like they are tuned pretty high but I would go for the one that drops off at 32 Hz the human ear can pick up frequency from 20-20000K Hz however the volume needed to hear in the range of 20-30 Hz is substantial and usually not reproducible in a car (unless your running lots of woofers and wattage) Music is typically in the 30-18000 range (there are exceptions but the vast majority is within this range) your output on Rap/dubstep type music will definitely increase close to the level of doubling also if you don't see an increase in output by facing the woofer into the cabin sometimes facing it to the rear will yield better output due to the wave reflecting back which can yield a 3 dB increase in output as an example take your cell phone play some music through its speakers while holding it in your hands then take it to the nearest corner in your room and fire the speaker into the corner the output will seem to almost double