I just finished my first DIY project, well almost. It needs one more coat of paint. I'll do that when I'm done playing I used the 85l adire alignment with a dayton 12" DVC. I was suprised at the performance. I even screwed up a couple things when hurrying to glue it together. Anyway now that I have finished with that one I'm itching for a new project. I would like to build a set of 3-way towers. I will probably build the dayton br-1 kit first. Just to get more familiar with crossover design etc. I have a couple of questions for you guru's out there. I was thinking along the lines of the veritas at speakerbuilder.net I was wondering about using a side mounted passive radiator. I can't seem to figure out the mass needed for pr's. I tried when first modeling my sub and I ended up with way too much mass for the pr. I followed the formula at diysubwoofers.org. I even had a my calculations checked by someone else. Is it kind of a trial and error type thing? What I want is a TMW/TMWW that will play down to about 25hz. Any help and or advice is appreciated. I do have pics of the sub just don't know how to post em. I just posted them so scroll down.