Hi guys. Just wanted to post a project I just recently finished up. They are meant to be quick, easy, and relatively cheap. They use the newer version of the 6.5" poly cone Dynavox woofers, XT25, and the PE BR-1 empty cabs. They can be made for under $300/pr and I am happy with the result. I'm not going to give my own subjective positive review, but I will point out the only noticeable downside I've found so far and that is that the bass is a bit fat or boomy in my living room unless well out into the room. I originally cut the port at 3.5", which looks to tune it around 49hz or so, and I may increase the length to about 5" to lower it to around 40ish. We will see. I'll attach the squiggly lines. I did nothing to deal with reflections and I'm a complete novice with measuring and omnimic, so perhaps ignore below 500hz. Thanks for looking.