Thanks again to everyone.
I just built a passive 2 pole high pass filter to feed my sub. After playing around with different component values and the settings on the sub, I have gotten much closer to a flat response. I'm only up about 5 dB at 30Hz and the rest of the bass region is flatter than it was. Given that my measuring tools are probably not that accurate anyway, I feel pretty good about the response I'm getting. Besides, it sounds good.
I just built a passive 2 pole high pass filter to feed my sub. After playing around with different component values and the settings on the sub, I have gotten much closer to a flat response. I'm only up about 5 dB at 30Hz and the rest of the bass region is flatter than it was. Given that my measuring tools are probably not that accurate anyway, I feel pretty good about the response I'm getting. Besides, it sounds good.