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This year I built my first two pairs of speakers for the [Fostex FE166En](http://www.fostexinternational.com/docs ... E166En.pdf) 6.5" full-range driver.
The first pair I built was a TQWT very similar to, if not exactly, [these](http://www.bonavolta.ch/hobby/images/audio/tqwt1.gif) plans. They sound great in my opinion. Nice punch and the bass goes surprisingly deep but is not out of control, however lack sharpness in the tops. Great for rub-a-dub! [Real life photo](http://i.imgur.com/I8gzoBd.jpg). (The color is not the one I aimed for...)
I just finished the second pair. They are ["angular spiral" speakers](http://i.imgur.com/0UKHfQz.gif) designed with the same driver in mind. The bass is much more constrained and the rest is more or less unchanged. I can crank up the volume and get a bit more out of the tops without irritating the neighbors, though. Still sound pretty good, but not for the roots and culture.
My power amp is a [SMSL SA-36a Pro](http://www.amazon.com/SA-36A-TPA3118D2D ... B00JXCEDGS), $50 Chinese T-Amp, and I use a cheap ($25) Chinese tube headphone/preamp, model Little Bear P2-1.