Alright, Im rebuilding a box for my subs. I cant decide if I want to rebuild the box to my 28hz again because it wuold high the highs moderately and rumble like thunder and shake everything to death on the lows hair tricks absolutely! But it felt like I wasent createing any pressure and it dident feel like it was loud. Any time I tune deep as I did i get it to sound good and i love the supriseing deep bass that rumbles, and sounds good, moves a ton of air, flexes everything and creates hair tricks. I had a box that I had tuned to 34hz and hated it. Didient like it. So I guess Im just going to have to build 2 boxes. 1 to 28hz for my daily driveing and another box to 68hz (resonant frequency) for spl comps. Or I was thinking along the line of interchangealbe ports. I like slot ports but How could I go along of making it interchangealbe? And does my tuneing make sense of sounds better and how it slams extra hard on the lows?