Lets have details. What size? Ported, PR or sealed? Finally how much power are you going to put to it? I am leaning towards sealed with a linkwitz transform and 2000 watts. The sealed enclosure will be about 47 liters. I couldn't find a ported box that really worked well with this woofer. If I made the port large enough to preclude chuffing, the port resonance would be at to low a frequency. I don't really want to use PRs. I have a PR sub now and want to try something new. Also, I don't want to spend $200 on PRs. Anyone have any solution to my ported box dilema? BTW, the ported box I was modeling was 160 L tuned to 20 hertz.