Hello all I have a question. I am thinking about building a sub from scratch I want to use Birch plywood 13 ply and inside line it with 3/4 MDF resin saturated. Ok what is an "infinite baffle" and I know what a ported enclosure is. Ok I have a huge peavey dth 215 subwoofer. it is ported and I would like to retune it for a real low frequency. I was told you can retune non horn enclosures with some difficulty. I am not a mathematician so is it true that you have little worries about "tuning" with a sealed enclosures? I know they require a lot more power. But I have so many amps that power is not an issue. Thanks for any help you all may give.