So, I think I've decided to go the DIY route. Seems like I can get better drivers and a smaller footprint sub for a better price than elsewhere. So, a few questions. I have been playing around in Win ISD and Unibox(?), and I really have no idea what most of it means. What does the box frequency mean exactly? I am thinking of going with the AV12-X with dual 15PRs or possibly the shiva-x with 2x15PRs. I would like to power it with a plate amp as I have no room for a stand-alone amp. So, I was considering either the O Audio Bash 500W that has the EQ and SSF or an eD amp (either LT550 or 1300) which has no SSF but their guys claim doesn't matter because of the limits of the amp itself. So, which amp would go best with this setup? Also, I was probably going to go with an 18-20" cube or roughly around there as I have seen suggested on other forums. This would be a primarily HT sub and I want something that can really hit hard pretty low, my previous sub was a HSU STF2 and it was nice but just didn't really hit hard enough for me. My boss has offered to make the box for me since he considers himself a wood-working master and a challenge to his abilities. I appreciate any and all feedback. Thanks.